Operation and testing of a Honda main relay (PGM-FI) - an SD Premium video

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Following up my previous case study on a 1999 Honda Accord • How to identify a bad ... , I discuss in detail the operation of a Honda PGM-FI main relay with my class at Rosedale Tech. We get to go into detail about design characteristics, relay operation and control, and some unique features in this relay that might be difficult to understand. Once you watch and understand this material, you’ll have no problem diagnosing these relays and related circuits!
Engine Performance Diagnostics chapter 15
Topics discussed
- identifying the two distinct relays inside the PGM-FI relay, and the circuits they feed
- understanding the control and load side of both separate relays
- correctly dissecting and coloring a wiring diagram for diagnostic purposes
- understanding why relays are used in electrical system designs
- applying Chapter 3 principles to identify relay control circuits
- the cranking circuit bypass, and why this feature was included in the relay
- which solder joint failed in my previous case study video, and what caused it to fail
Playlist
- (Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing
• (Chapters 14, 15,16) F...
Related videos
- How to identify a bad main relay on a Honda (PGM-FI)
• How to identify a bad ...
- How to test and fix a PGM-FI main relay - Honda/Acura
• How to test and fix a ...
- Fuel Pump Electrical Circuits Description and Operation
• Fuel Pump Electrical C...
- How to test fuel pressure, injector pulse and spark with basic tools - Honda
• How to test fuel press...
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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25 июл 2024

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Комментарии : 198

@lildio33619 11 лет назад

I just wanted to let you know how amazed I am at how fluently you are able to explain everything, I sat through both the CO2 sensor and the Main relay explanation and even the fast idle issue and even when you are learning while you're teaching you manage to explain it very detailed. I've learned a little something from all your videos and I support you on all your teachings and hope to enjoy more of them. I would love to hear a seminar or any classes you teach would be interesting.

@Ottonic6 6 лет назад

I have a 2000 Accord and I have already had to deal with this problem and thanks to you I was able to fix it. But, I found this video even more informative. There is so much to it so I have watched it about 4 times... Great stuff Paul. Thank you!

@Floweaver 3 года назад

Really is a great video I am looking forward to viewing more of the videos. So much info in a short space. I have a lot of learning ahead of me.

@tonymadden2219 4 года назад

I cannot find enough time to get these videos watched. I finally found a guys that can teach my adhd self.

@nerajmason Год назад

Tttþtttþþþþtþþþþ

@nerajmason Год назад

Tttþtttþþþþtþþþþ

@MrFmccarty 2 года назад

Need to watch this 100 times. For my brain. while you’re talking makes everything make sense. My relay must be bad!

@andrewvinson7369 3 года назад

FINALLY! I UNDERSTAND. Wiring up a race car and needed to bypass this. Thanks for all the info on what this powers up.

@solesearched 11 лет назад

Whoever designs the wire harness in a car is a genius in my book. It really makes you appreciate how much time and effort went into the design when you learn how to read the wire diagram.

@arieldecko4847 6 лет назад

I just want to say thank you so much for these very helpful videos. I’m a student in southwest Florida and our teacher just put in his two weeks to focus on his shop but he quit right in the middle of our electrical chapter. He also doesn’t explain it like you do and I grasp it much better watching your videos. I appreciate it and thank you again!

@ScannerDanner 6 лет назад

Dude you Need to check out what I'm offering on my premium channel There is a 14 day free trial. www.scannerdanner.com/join-scannerdanner-premium.html Even if you don't thanks so much and keep watching these video here

@tnamen1307 4 года назад

@@ScannerDanner Sir, please abit of clarification from your end. Thanks. 1. will both the 2 input positive wires to the fuel pump relay will go live permanently as long as engine is RUNNING or only the input positive of the PRIME circuit will turn off while engine is RUNNING??? 2. How the prime circuit behaves when engine is RUNNING?? Is it off or on while RUNNING engine? 3. How the 2 currents behaves when they met at the 86 pin of the relay?? Will additional current will flow to the relay at the same time when engine is at START AS WELL AS RUNNING SIMULTANEOUSLY??

@ScannerDanner 11 лет назад

thank you so much! i may be doing some training around the country next year. not sure of specifics yet. i really appreciate your feedback. you made my night

@williambruchert7795 10 лет назад

These videos are giving me quite a bit of ammo with my dealer. My relatively low-mileage '99 Accord Coupe V6 has been having starting trouble for over 2 years. I originally had intermittent starts. First my dealer replaced the battery cables and starter, telling me there were "two items both contributing to the issue," which didn't fix it. $800 and completely unnecessary (according to car-savvy co-workers). So then they "replaced" (or more likely just repaired the solder joints on) the PGM-FI at no charge, telling me then "well, actually THREE issues all contributing to the same problem." This resolved the intermittent starts, but I continued to have long crank times with weak, hesitant starts. Now they've replaced my fuel pump, after promising me that by leaving the car with them for 3 days they'd have it fully diagnosed and resolved (telling me it would either be the $750 fuel pump or a $250 "fishtail"; I paid $666 for the pump after 10% off coupon)... and I still have the same problem. $1,500 in unnecessary repairs. Near the end of your video, I wondered if the problem is with the FLR computer-controlled ground. Of course, I can't find anything about what they are calling a "fishtail" that might explain the drop in fuel pressure they said the car has. Hell, maybe it's just a 15-year old gas cap I can replace for $10! Anyway, I've enjoyed both videos related to the subject. Keep up the good work!

@Floweaver 3 года назад

I am just starting to learn about diagnostics and I know that Paul Danner is a great teacher and I am lloking forward to going through his videos. Great PGM-FI video I am looking forward to figuring out this problem. Great learning opportunity.

@ScannerDanner 3 года назад

Thank you! You found the right channel my friend. I look forward to hearing from you some more as you continue to learn. God bless

@bobcatcrazy7490 10 лет назад

ScannerDanner, You are THE MAN!!! This is the most informative post I have seen on RU-vid! It gives all the info needed to find the issue with my 93 Del-Sol fuel system. Great content thanks!

@stage3performance 11 лет назад

Another awesome video! I just bought your book and all I have to say is I am very satisfied. The book is well put together and I will strongly recommend it to all my tech buddies.

@bigairnohander 9 лет назад

Paul, thank you for taking the time to splice this information together. You answered your own question at 29:05 about the engineer's rationale, for employing a series resistor in the hold in circuit. More electrical pressure: more current across a fixed resistance (coil) HEAT/COMPONENT longevity. Addressing all you younger technicians watching this, I want to reiterate the importance of knowing what is occurring in the circuit that you are troubleshooting. I have seen Honda and Acura dealership technicians that don't understand the workings of this circuit. You cannot throw parts at problems and expect your customers to continue bringing you their business. I encourage you to watch as many of Paul's videos as possible. You need to clearly understand what results you should be getting as you go through personal troubleshooting regimine. Thanks again Paul, this is well done overview.

@ScannerDannerPremium 9 лет назад

Thanks Randy!

@jamesbuttery3862 7 лет назад

LOL

@ianmuggeridge 9 лет назад

Talking about the diodes...in the diagram the bottom one protects the computer against connecting the battery the wrong way, the middle one protects against defeating the immobiliser circuit and the top one prevents the second circuit at fuse 13 being active all the time, second circuit is probably a start relay to remove non essential electrical consumption during cranking. Great video channel, many thanks.

@jamesbuttery3862 7 лет назад

WOW! Great stuff Ian!

@1keykneedeep 6 лет назад

Great information. This helped my current situation. Best video on RU-vid.

@mattm2411 4 года назад

perfectly explained, i hope they paying you good. you taught that so well

@joevanygutierrez4209 Год назад

Thank you for putting in all your dedication and hard work. Please help me out a lot.

@ScannerDanner 11 лет назад

thank you my friend. i appreciate your input and comments.

@tmanda323 3 года назад

Can you come to live in Serbia and teach us diagnostics?

@ScannerDanner 3 года назад

@@tmanda323 I wish :-) But I can offer you remote training via my website www.scannerdanner.com/join-scannerdanner-premium.html Hope to see you there!

@aletapearce2369 7 лет назад

Great job way to demystify this issue.

@vicky-nc3to 4 года назад

I was looking for such explanation of circuit board.. I found a lot of info.. thanks for video... Looking forward to learn more

@tnamen1307 4 года назад

If such good explanation video was available during my high school life, I would have become someone in engineering line!!! Your explanation so clear and straight to the point. Thanks so much sir.

@ScannerDanner 4 года назад

Thank you! You've been eating this stuff up. When you run out of the free videos here, come join my premium channel. It is $11 a month giving you access to over 430 training videos. Hope to see you there someday. www.scannerdanner.com/join-scannerdanner-premium.html

@EHERME11 10 лет назад

NICE explanation thank you very much for teaching

@wolfparty4234 3 года назад

Q; at 24:23 why? So the part will fail and for it to be such a uncommon part you would have to take it to the dealer for work. Love this video. I’m learning a lot!!! My neighbor was a Honda mechanic for over 30 years and he told me that the engineers have designed parts to fail so that the car would be brought back to the dealership. It’s just what he told me👍🏻

@paulfiebke3909 3 года назад

Love your classroom teaching, use to be on pream deal throw pay pow. They were charging me for yours, and 26dollars for tv on my phone, i went brock and not understand why untell i got a statement and was shocked, keep up the good work, and god bless you and your faimly

@kolt46 11 лет назад

The why... this relay's coil is important to work at a lower cranking voltage (~8v) and expected to last when car runs at ~13-14v. Coil designed to work reliably at 8v would have tough time living at 14v because of excessive operating heat. Designed to maximize life of this component. First video of yours I have commented on. Find all you videos extremely interesting (i am in industrial controls). You have a very good teaching ability and style. Thank you for your effort.

@ozzstars_cars 11 лет назад

Video was great! It's all about the current flow

@strokesurvivorvideologhuss6183 3 года назад

what a brilliant video thank you for sharing your knowledge

@hecubalaud4635 Год назад

Wow! This video was excellent. I really understand the process now. Great job. 👍

@ScannerDanner Год назад

Thank you!

@abbeyrham4220 11 лет назад

thank u very very much, and please keep it up, your videos are really educative. thank u for sharing your knowledge.

@malisa696 11 лет назад

I like your teaching mister Paul.... nice explanation...but must look up this video several times for a very good understanding how this works... :)

@georgengozi2383 Год назад

I like your tutorial.plain ,clear and simple

@georgengozi2383 Год назад

Kindly assist with the location of pmd fi on Honda stream

@ahill007ny 11 лет назад

EXCELLENT VIDEO!!!!!!!!!!!!!!!!

@stephenmarshall5529 3 года назад

Very helpful, very grateful!

@nupucotonosor 9 лет назад

Thanks for the video great info

@jonathanlorenzana9783 8 лет назад

excelent video. thanks.

@ScannerDanner 11 лет назад

Thank you so much! Did you get set up for the free lecture video sample yet? I seems my emails more times than not get dumped into peoples spam folders and they miss the offer. I really appreciate your comment in this public setting.

@billyb6116 8 лет назад

This was an AWESOME video. It made it incredibly easy to understand the problem and the fix. Maybe a little more detail thatn some would like... but I loved the information.

@billyb6116 8 лет назад

One question. Would this relay malfunctioning cause the dash (Tac, Speedometer, etc..) to go dead?

@ScannerDanner 8 лет назад

I don't recall that symptom with these.

@ScannerDanner 8 лет назад

Thank you!

@ashemorris 8 лет назад

ScannerDanner, this video has helped me out a lot. When I turn my car to the ON position first thing in the morning, my ECU does not turn on. But if I wait about 5 minutes with the key still in the ON position all of a sudden it comes on because I hear my fuel pump and the LEDs on my Hondata S300 chip come on. Anytime after that first 5 minute wait and it comes on like a charm every other time, until I let it sit overnight. So I am thinking my ECU isn't getting any power when I first try to start the car. I've already gone through the hell of replacing the distributor, the ECU plugs, the fuel pump, the main relay. We even tried my ECU in another civic and it worked fine. So like I said I believe my ECU just isn't getting power in the beginning and something is warming up for 5 minutes before it finally sends power to my ECU. Tomorrow I will finally know send I have a test light hooked to it and also wired in a "T" shaped power source to both IGP1 and IGP2 to a switch that only gets power when in the ON position. If my ECU doesn't get power in the morning when I first turn the car to the ON position then I will flip the switch for my own power source and see if she works. If she does come on and works fine does anyone have any suggestions for the right sized Fuse to put in my "moded" power line to my ECU just in case I ever have a voltage spike? Last thing I wanna do is fry my ECU. Or do you have a suggestion on where my stock power source might be having the issue? And also could you post or send me the pic or a pic of the diagram you used for this video?

@ScannerDanner 8 лет назад

+Ashe Morris ignition switch is a huge problem on these

@rwbishop 11 лет назад

Excellent!

@padmaruk 3 года назад

I am looking for more videoes where you only teaching about how to read a wiring diagram. By the way this is a great video. Thanks.

@ScannerDanner 3 года назад

Come join my premium channel on my website. I current have over 430 training videos and counting. The price is $11 a month and I offer a 14 day free trial. Hope to see you there! Of course I have many videos right here on RU-vid as well. www.scannerdanner.com/join-scannerdanner-premium.html

@spelunkerd 11 лет назад

This is the best explanation that I've found, for a very complex topic. I was looking for a typical diagnostic pattern, but depending on which connection is bad, presentation may vary. I'm surprised this doesn't happen often with other manufacturers -- solder joints are everywhere.

@ScannerDanner 11 лет назад

Resistance does affect voltage. An increase in resistance will always decrease current flow. (ohms law). However an increase in resistance can cause a voltage rise (thermistor circuits for example) or a voltage drop depending on how many resistors are in the circuit and where you are measuring.

@omwinter145 5 лет назад

One of those relays controls the cooling fan relay. I had a bad connection at my cooling fan and it caused the relay to overheat and stall the car ! :0( As best as I can figure.... BTW...Great video !

@bigairnohander 9 лет назад

Your comment/question about the purpose of the F/I relay's diode can be explained by coils depicted in the diagram. The lower one has more windings than the F/P coil. The circuit is interupted in bias flow...this is a engineered CEMF supression feature, indirectly isolating the F/P coil. Why does Honda/Acura place both the F/I and the F/P relay in one housing, instead of using a couple of bosch relays? Part of the reason is stated above...the other aspect is that they sell copious quantities of this item. Honda does not recognize the solder and go method. Flat rate dealership techs figured out the issue was in the board long ago, and they would run their own "parts exchange programs",out of their bottom tool box drawer, by soldering the contact points. The problem is that, cold solder joints are a common issue in electronic components...especially after a repair (see your previous video for a good example the difficulties of attempting a solder job with an all purpose iron). All in all, the best practice is to replace the component as a unit. I have seen too many customers lose faith in their repair shop, when the vehicle is back on the hook a month later, with the same issues. The same is true for DRL relays... Thanks again for your time, in laying out these circuits. Your topics are always thought provoking.

@santogoso210 Год назад

Thank you The presentation and your explanation are clear and direct again thank you Im Sure you would have made an excellent educator brother NO JOKE again THANK YOU.

@ScannerDanner Год назад

I've been teaching at Rosedale Technical College for the past 20 years 😉 so thank you! It is good to hear that

@santogoso210 Год назад

ive been going crazy i own a 2003 civic ex 4 door 1.7 and changed the fuel pump and nothing so i let it go after 1 year an horrible neighbors whom done a number of things make the long story short since ive been out of work i couldnt do anything well received a city notice to either fix it or get rid of it come to find out the new pump i had my fuel pump was changed by one of my amazing neighbors so i bought another one after changing the relay the fuel pump is now priming however it does not start and i dont know where the main relay is so thats where im at not having much mechanical knowledge sucks but you did help keep up the good work bro.

@ScannerDanner 11 лет назад

The printed version is separate from the eBook. AES handles my paper version because they are a bigger company and can ship much cheaper than I can, especially when it comes to shipping outside the lower 48 of the US. If you buy the printed version from them, you will still receive the free lecture sample that eBook owners get from me but the eBook itself is separate. Thanks!

@Mark33090 11 лет назад

Would the purpose of the diode also be to prevent voltage from the collapsing field of the coil from going to the computer when power is switched off?

@SpiderWebUntangled 11 лет назад

Heavy resistor is there to: 3W, 42-Ohm. Reasons: reduce relay heat buildup, reduce current, reduce transistor stress. Diodes are probable reason: Prevents ECU damage during accidental reversing of the battery cables.

@kolt46 11 лет назад

Reason for resistor..... Relay coil designed for lower voltage of battery at cranking or rest. Then when engine starts, alternator is able to provide higher system voltage, hence the need for a resistor to cut back current when at higher voltage. Sort of same concept of the ballast resistor in the old conventional ignition systems. To compensate for a lower battery voltage during cranking.

@heyitschinoable 5 лет назад

Paul do you have the video you spoke about making in this video? The one about wiring in fog lights with a relay?

@roadtripPinas0630 4 года назад

A 7 year old gold (video.).!

@djohnnineonesix820 10 лет назад

One question... Even if the ECM isn't getting power still able to turn the check engine light on wen you turn the key on???... Probably yes thanks to another transistor in there... I'm thinking replacing my solenoids for TRIAKS

@ScannerDanner 11 лет назад

i can't verify that at this time but i am pretty sure they are identical. in fact pin layout suggests this is a typical relay used in hundreds of different applications. i agree with you that it is within the pcm driver that this mystery lies.

@WALTERLDJ911 6 лет назад

THANK YOU VERY MUCH WHAT A GREAT VIDEO,,,,,,

@davekindsfater1384 9 лет назад

Strange question here. A friend of mine has a 98 Accord. He has had issues with it dying randomly while driving. He had to hold the key in the start position to keep it running. I replaced the ignition switch thinking that was the problem. The battery was dead, after the battery had charged, the start would engage with the key in the off position. I made sure the switch was in the off position as well, and it will still crank on its own. Have you seen this before?

@jorgemcaldas Год назад

Very Nice

@Turbotomass 11 лет назад

From a diagnostic stand point if the CEL didn't flash / no power or partical power going to the ecu from the bottom coil would you still get spark??

@obafaiyevictorudeh8753 4 года назад

Nice one

@chrischeatwood9468 Месяц назад

I have a 2002 Honda Civic lx , with just the key on the fuel pump says running and will not ever reach its prime and shut off , could it be one of the two pgmfi relays , i have a blue fuel pump relay with 5 pins that clicks and gives power to the pump but something is keeping power on the pump with just key in the on position, not cranking, itll run and keep running till i turn car off, could it be pgmfi staying closed ..? If do which one , one on far right under glove box or one on the left ..?

@murjiim 11 лет назад

Can u suggest the reason that resistor. Is in series is to extend the life of the relay so it doesnt burn out faster?

@johnmalepa6628 7 лет назад

HI I wonder I you could help me , my Honda civic 2007 2.2 ctdi diesel have a parasitic draw of .6amp in sleep mode it can be intermmitent , it takes about 56 seconds approx. to go to sleep mode , and sometime it does not and stay at .6 amp any ideas ! please

@stage3performance 11 лет назад

Yes, I just found the email in my spam folder. Thanks for the heads up!

@obafaiyevictorudeh8753 4 года назад

I have Honda power bike the problem of it is showing fi on the dashboard so it's not starting what do you do to make it start

@starbrightpools 4 года назад

Do you have a diagram for the PCM for a 2015 honda civic 2.4?

@evo6swap Год назад

Is this a good idea to do as well you talk about bypass and it looks like they did bypass a few things

@lindamalepa7823 Год назад

Hi my Honda Civic 2.2diesel 2007 is not going to sleep when I drive the car for less than 10 minutes it sound the PGMI relay is energies for this period until I switch the ignition on and off then it will DE ENERGIES any ideas on this issue please

@laptopdisassembly9886 7 лет назад

The resistor might be there to reduce PCM transistor current and therefore the heat. The lower (on picture) relay is as important as the upper one (if it releases the contacts due to low voltage, car will also not start). So it can`t be for extra starting insurance. It also can`t be for reliability for the coil...lower relay has coil with direct battery power and if it fails, car will not run....and these relays will be changed in service together anyway. There diodes... maybe some kind of electrical circuit interference counter-mesure?

@hadidamedlamin2035 3 месяца назад

thanks man

@felplayvina 11 лет назад

I think both relay have ground all the time and diode are to stop the ground, and the yel/blk wires is use by the pcm for rpm to cut off in case of accident. does yhis make sense to you? Paul. I think crank signal is use for ignition control and injection.

@willferrmail 10 месяцев назад

Thanks!

@ScannerDanner 10 месяцев назад

Thank you! I take it this information helped you?

@sivucit 11 лет назад

Paul, does Honda still have this design in practice today for new vehicles.

@chaserpm 11 лет назад

Hello Paul.. quick few questions re: your eBook.. I apologize if its off topic to your video (always great videos by the way - have learned a huge deal from them :) ) . if I buy the printed version, do I also get access to the online version ? also, how come you don't have the printed version on your own site ? thanks

@room101935 11 лет назад

I was told that the reason for the power reducing resistor's is that they have to design the the lowest current draw system when the car is in the run state to reduce the loading on the alternator so to improve mpg and emissions. I'm not sure as to what extent this helps the cause.

@kevinjarrells4385 10 лет назад

maybe full system voltage is required to close the relay and only a fraction is required to hold the solenoid in. thereby reducing the load on the coil prolonging its life expectancy?

@gbenz6494 5 лет назад

You mention "wake up signal" which turns the fuel pump on for 1 or 2 seconds. At the same time the Check Engine Light (CEL) reflects that by turning on and off. Once the check engine turns off the car is then able to start. What is going on in the Main Relay and the ECU when the Check Engine Light (CEL) remains on for more than 2 seconds. If the CEL does not turn off you are unable to turn start the car. Some Honda owners have reported waiting up to 15 minutes for the CEL to turn off to then finally being able to start their cars. Is the problem with the ECU or is the problem with the Main Relay? Can poor grounds, a bad ignition switch, a bad fuel pump, also affect the signal that tells the CEL to turn on and off? I have a 1994 Honda Civic LX thats driving us crazy. 1. We replaced the Main Relay but CEL still randomly stays on for more than 2 seconds. We have waited up to 10 minutes before the CEL turns off. We are able to start car after CEL turns off. (Can hear the pump prime just before car starts). 2. The ECU was diagnosed with leaky capacitors. ECU was repaired and we continued to have the same symptoms described above. We cleaned out the ground wiring at the Thermostat Housing (ECU ground). Still same symptoms. We noticed that that the car is more sensitive to rainy and damp days but still acts up under normal weather conditions. Questions: 1. Can a weak or bad fuel pump cause the CEL to remain on. Maybe the pump is so weak that its taking its time to build pressure on the line? Can the ECU or main relay detect fuel pressure? 2. Can a bad distributor, specifically the ignitor or the coil affect the CEL and cause it to stay on for over 2 seconds. Thanks for your channel. You are very clear and informative

@danielrotar01 2 года назад

Would love to see an answer on this

@evo6swap Год назад

Check this is out the ecu board Go's out to and the lose the ground side to turn on the fuel pump too and here is a kit to take off the 2 relay

@tnamen1307 4 года назад

LSir, please abit of clarification from your end. Thanks. 1. will both the 2 input positive wires to the fuel pump relay will go live permanently as long as engine is RUNNING or only the input positive of the PRIME circuit will turn off while engine is RUNNING??? 2. How the prime circuit behaves when engine is RUNNING?? Is it off or on while RUNNING engine? 3. How the 2 currents behaves when they met at the 86 pin of the relay?? Will additional current will flow to the relay at the same time when engine is at START AS WELL AS RUNNING SIMULTANEOUSLY??

@ScannerDanner 4 года назад

1. as long as the ECM is still receiving a crankshaft position sensor signal, the fuel pump circuit will remain "alive" 2. the prime is just the initial key on period, when the ECM "wakes up" and not all cars have it 3. I have to go back and watch to answer this one, sorry

@MrNoyazz 2 года назад

it possible to just bridge the main reelay

@murrmann7234 7 лет назад

how can i get premium. Thanks

@nickjames205 2 года назад

Hey, I know this is an old video but I need help. I was trying to wire in a kill switch in my 2003 Honda Civic because two cars have got stolen from my house in the last month. I wired a switch into the black and white wire going into the main F1 relay. That was the wire I was getting power from. The switch worked however I somehow grounded something out on the frame and suddenly I'm not getting any power to that wire, even if I put the wire back together. I was able to get me and my wife to work today by running a wire straight from the hot terminal of the battery to connect to those two ends of that wire and the car runs but I'm sure that's going to cause damage eventually. How do I find out why that wire no longer has power?

@ScannerDanner 2 года назад

eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1= This is a link to the DIY version of the same service info and diagrams I use. I can't check a diagram for you right now but for $20 you can gain access to everything you need. If you give me year, make, model and engine size, if I get time later I can look too.

@shieldcracker 11 лет назад

I think IF there is any reason at all to have the resistor we need to look at the computer pulldown circuit to find it. Assuming that both relays on that board are identical (I think they are), then both relay control circuits should have series resistors, yet it is only the fuel pump relay that has one. The very same relay that is being grounded by the PCM. Mr. Paul can you verify if both relays are identical and possibly provide us the markings for IDeing them?

@rachelhickey2963 8 лет назад

I got a 2001 Honda accord 2.2 type r car just cut out wouldn't start again any ideas ?? getting petrol an spark

@ScannerDanner 8 лет назад

+Rachel Hickey fuel pressure AND fuel injector pulse?

@dohc22h 4 года назад

I think the reason the "cranking bypass" has no resistor and the Yellow/blk (key on power) has a resistor and a diode is because when cranking, the blu/org wire (cranking bypass) will have lower voltage to begin with since the starter is pulling most of the power. So after cranking is done the yel/blk will have full voltage and would need a resistor to match what the blu/org puts out during cranking. The diode would be there since there would be voltage fluctuation from the on/off of the starter.

@dohc22h 4 года назад

ScannerDanner is my HERO

@ScannerDanner 11 лет назад

It would be so minuscule in this case that I just don't think that applies here. there are 20 other relays on this car that do not have series resistors in the control circuit. good point though. manufacturers are employing that thought process on todays cars

@Jason-hg9lz 7 лет назад

will a relay get hot and quit then cool off and work again

@ScannerDanner 7 лет назад

It is normal for a relay to be hot to touch when it has been energized for a long time, like a fuel pump relay that is constantly energized with the car running

@lineartechbd1600 8 лет назад

ScannerDanner, I have a question. If it is the case that the lack of a crank signal to the computer will give you no power output to the fuel pump, does that mean that if I don't have power to my fuel pump, it could be a problem in my distributor where the sensor is located? I have this same car and just changed the distributor but now I don't see any power going to the black yellow wire at my fuel pump when I turn the key to on or when I crank it.

@ScannerDanner 8 лет назад

+lineartechbd1600 yes, and I'm not 100% sure if all Honda's will prime the pump on initial key on. But I believe it should, which would lead us away from the distributor inputs. But we cannot completely rule that out yet. Check for injector pulse next. This will verify distributor inputs to the ECM and also ECM function. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-SUxagOAVS5M.html (a very good one for you, it's on a Honda) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZgNY3ZpjSsU.html (i just posted this one and I address your question about distributor inputs)

@lineartechbd1600 8 лет назад

ScannerDanner I was looking at your video again and in it, it shows several fuses at the top. One fuse was located under the hood ( I thought there was only the one 15amp fuse on the side of the dash). I looked in the fuse box under the hood and saw a burnt out fuse so I replaced it. Now I have power at the pump. I replaced the pump (I keep an emergency pump and distributor in the trunk cause I travel so far from home). That fixed my problem. Thanks for the video cause I would have never realized there was a fuse under the hood.

@urtjytjtuty 11 лет назад

can't find part I anymore?

@kolt46 11 лет назад

Another possibility for why.. to provide a voltage drop to prevent this relays coil from draining all this circuits current. This resistor would provide a greater voltage to other components tapped before the resistor. .

@napoleonmanso6993 4 года назад

Please publish a fuse box (hood) description of Honda Accord 95

@ScannerDanner 4 года назад

where to get service info (same diagrams I use) for your car eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=

@jeffstowasser9176 7 лет назад

lmfao...Playstation has on on and off switch...love it

@AdinSLaboy 2 года назад

omg I'm dealing with this problem for months in my case the main relay its new I don't have power to the fp side and couldn't find it yet the problem its driving me crazy I wish I can get it on with this video

@ScannerDanner 2 года назад

🤣 I have some other honda pgm-fi videos too as well as some ignition and fuel pump failures and how to troubleshoot those (Honda specific)

@brasanford1 8 лет назад

Curious as to what the computer sees from the immobilizer, and what the immobilizer might tell the computer not to power on. Any feedback is appreciated. 03" Honda Element 2.4 VTEC FWD

@ScannerDanner 8 лет назад

+brasanford1 on just about all of the anti-theft systems the computer will shut the injectors off to prevent the car from starting. typically you will have a start stall condition. initially the computer will fire the injectors and then shut them down. no other systems are affected

@ulianotech 4 месяца назад

im having issues with an 09 CRV injector 3 isnt getting pulse causing a misfire amd a DTC. based off this diagram i would assume the break is between the injector and the junction box as im getting ground to 1 2 and 4 just fine. would this be the correct assessment? im not sure what else to try and check. the original harness to the injectors was destroyed so i put in a new harness.

@ScannerDanner 4 месяца назад

Shut the engine off, and restart it. Do you have injector pulse for a few seconds before it shuts down and stops firing? If you do, you're barking up the wrong tree. Intentional injector shutdown happens when the ECM is protecting the cat from a misfire (ignition or compression issue)

@ulianotech 4 месяца назад

@@ScannerDanner very interesting. as i do restoration and custom stuff on much older cars whenever i end up helping out a buddy i end up learning something new. just finished watching your class on the topic of intentional shutdown. my first tests in the morning will be to do a resistance test on the injector and then your start/stop test with the noid light plugged in. now if i do find its intentional shutdown would the next step be a compression test of the cylinder?

@ScannerDanner 4 месяца назад

Watch this one! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-v9csp3-4VSs.html

@ulianotech 4 месяца назад

@@ScannerDanner i did watch this one. very informative. makes me want a picoscope kit. yeah i would assume that means im gonna have to check compression

@ScannerDanner 4 месяца назад

@@ulianotech could just be an oil fouled plug like mine had (engine ring issues)

@tnamen1307 4 года назад

What components control the fuel pump to PRIME FOR ABOUT 2 SECONDS only at key ON?

@ScannerDanner 4 года назад

The ECM does when it wake's up (as soon as the key is turned on)

@tnamen1307 Месяц назад

@@ScannerDannerhello I know why the resistor is placed in series with the coil. It's purpose is to basically LOWER THE AMOUNT OF CURRENT when key is at ON POSITION. That's to Conserve Battery Power. Say, consider only the coil, if the coil resistance is 100 ohm. Then at Key ON say at 12.5V, the coil is constantly ON. Hence, total current is 0.125A. Also, one thing to note is that relay still works perfectly even at 9V. So, at 9V, total current is 0.09A. Now, we add a resistor of 38 Ohm in series with the coil so that approx 3.5V will be dropped across the resistor maintaining the same previous total current of 0.09A throughout the series circuit. In this case, the coil still energized perfectly. Hence, power consumption is reduced and battery is protected from draining. So, with ONLY the coil, the total current under 12.5V is 0.125A. If resistor is added, total current is 0.09A with 9V across the coil. In both cases, the relay is Completely Energized. So, difference of about 0.035A of current which is very very significant difference if key is ON for long hours. Hence, power consumption is maintained. Hope this helps 😊😊😊

@1shorte4wssj21 Год назад

GREAT VIDEO. I have a 94 honda accord ex that ran great and one day, crank no start, flashing d4 and no comm. If I leave it sitting with the key on for up to 5 mins sometimes. I'll hear a click and all of the sudden........ check engine light turns off, fuel pump primes and im up and running. Im trying to test the pcm but I dont know where to start.

@ScannerDanner Год назад

during the no start, take a test light (incandescent style) to battery ground and see if you have power going to your injectors and ignition coil, or distributor connector (blk/yel I think)

@1shorte4wssj21 Год назад

@@ScannerDanner Thank you so much for getting back to me.I tested iac, injector and distributor connectors and they have power. I also verfied my fuel pump is working. This is a great challenge.Thanks again.

@ScannerDanner Год назад

@1shorte4wssj21 during the condition right?

@1shorte4wssj21 Год назад

@@ScannerDanner yeah. I forgot to mention that i also tested IGP1&2 and both12.5 volts and GROUNDS at the pcm.

@ScannerDanner Год назад

@1shorte4wssj21 check for a 5v ref to your MAP or TPS next time it does it

@jawaone2474 2 года назад

Where would I look if my main relay plug is showing power on battery pin #1. But not showing ground? I put a spade connected in pin#1 and alligator clipped the end of the test light and than took the probe side of test light and probed ground and it DOESNT light up?!? No wires have been tampered with and all chassis grounds and engine grounds are in place and read 12.65v.

@ScannerDanner 2 года назад

you have no ground on pin 3? What happens when you give it a ground? Does the engine then start and run?

@jv6miata 2 месяца назад

Hey bud, I sent a question on your newest video for this

@dohc22h 5 лет назад

with the cranking bypass wire sending 12v through the coil... after cranking it doesn't take 12v to keep the switch closed... only takes 12v to initially close the switch on the relay and a llower voltage will keep the switch closed.... like a ballast.. so to speak

@rachelhickey2963 8 лет назад

resoldered the main relay now av to buy a new map sensor tomoz 80pounds again lol

@victornaja7927 2 года назад

No one talked about how to test this relay and what are good ohms to rule out a good relay or did I missed it. Please help

@ScannerDanner 2 года назад

Ohm testing relays is pointless and not needed. The problem with an ohmmeter is that when it tests good, it can still be bad.

@victornaja7927 2 года назад

@@ScannerDanner real quick please so if all points to relay but relay could read good with ohm meter than might as well replace relay right. Also you are a true blessing for society i don't know what we would do without you n you true skill n knowledge take care thank fir helping us all RU-vidrs

@ScannerDanner 2 года назад

@@victornaja7927 i prefer voltage measurements to confirm relay operation, as described in this video. I have other videos on testing this PGM-FI main relay if this one was confusing. Thanks!