Jeep Cherokee XJ 1996 easy CPS Swap (Crank Position Sensor changed easily from the top)

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There are quite a few videos out there showing how to pull out the CPS from under the car, using a LONG bunch of extensions. For those of you who really don't want to do it that way, here's an easy alternative that only requires spending $7-10 to buy a pivoting 11mm ratchet wrench (or getting a set for not a whole lot more). To find one, try searching for "11mm Flexible Head Gear Wrench". And FWIW, the set of metric flex head wrenches from Harbor Freight does NOT include an 11mm wrench (which is the wrench you need for this Jeep CPS).
Just an FYI - the problem with the car in the video ended up NOT being the CPS, but a bad alternator. It had some bad diodes, which causes it to put out voltage spikes that were interfering with the operation of the CPS and its associated circuitry. That doesn't change the process or the video a bit. If you're interested, the video showing the troubleshooting of the alternator can be found here: • P1391 NOT the CPS, 199...
Please Like and Subscribe so I can keep putting these (hopefully helpful) videos out there! Thanks!

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27 янв 2023

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Комментарии : 32

@dewittstr8laces84 Год назад

Thank You Mark. your kindness is exemplary.

@Mark_H_DIY Год назад

Thanks... Hope the video helped save you some time.

@abrahambarkhordar5572 5 месяцев назад

Really really good vid and method

@Mark_H_DIY 4 месяца назад

Thanks!

@richardrichard5409 6 месяцев назад

To avoid a world of pain dropping bolts in bell housing, top off first, back on last😎

@Mark_H_DIY 6 месяцев назад

One of my rules of wrench twisting is that you always remove the difficult bolt first and put it back on last. In this case, it's not because it's harder to get off, but you are right, the chance of dropping it into the bellhousing is the issue. Thanks for the great input.

@michaelt2800 5 месяцев назад

Did you remove a cable coming through the firewall just to the right and above the cps? I see a hole there in yours, but no cable. Mine has a plug and a cable there. I think it's going to be impossible to use this method with that in the way. It's a 98 sport. Theres a clear shot of the hole in the firewall at 4:40

@Mark_H_DIY 5 месяцев назад

I didn't remove any cable. I can only guess that the automatic XJ has something there that the manual tranny version (like mine) doesn't have. Or it could be for some other option my XJ doesn't have (mine is pretty much a no- option vehicle, other than cruise control).

@Mobile-mechanicNM 2 месяца назад

How has the NTK crank sensor been for you? The OEM mopar sensor has been discontinued and the dealer can’t find 1 anywhere so I’ve had this jeep sitting for almost a year since buying it from a customer and I haven’t been able to use it since. As a mechanic I hate using cheap aftermarket sensors from the parts store and I know for importation sensors such as this one OEM parts work best but I don’t want to waste $ buying a different sensor over and over til I find 1 that works close to as good as a mopar sensor.

@Mark_H_DIY 2 месяца назад

I couldn't agree more about using off-brand parts. But NTK is a known quality supplier for many Japanese and German cars, and I've used lots of their parts for decades without ever having a problem. The one I put in the Jeep has been working flawlessly since I did that video.

@Mobile-mechanicNM 2 месяца назад

@@Mark_H_DIY I might just give it a shot I’ve been calling dealers in random states throughout the US and no luck I’ve been told to try a brand WVE who I was told previously made the mopar sensor for these jeeps but I couldn’t find anything to support this claim

@Mark_H_DIY 2 месяца назад

@@Mobile-mechanicNM NTK is going to be head and shoulders above the parts store house brand parts. (IMHO)

@thegrayjedi5202 Месяц назад

96 Cherokee here, if the engine turns over, and will actually fire if starter fluid is added to the intake but WONT stay running, is that a possible fuel pump issue? I have ZERO fuel pressure and I don’t hear it purring when I turn the battery on. So would the engine crank and fire with a bad CPS? Or should I be checking fuel pump?

@Mark_H_DIY Месяц назад

If it fires up with starting fluid, you can forget about ignition problems. Your problem is the fuel pump, if you don't hear it hum when you turn the key on.

@thegrayjedi5202 Месяц назад

@@Mark_H_DIY appreciate it dude it sucks but at least it’s narrowed down to the issue. I’ve already switched relays and tested them so there’s power at the relay I gotta actually drop the tank and check the pump now I guess. Thanks!

@Mark_H_DIY Месяц назад

@@thegrayjedi5202 yeah, once you verify that you have voltage going to the pump wires, there really isn't much left but to replace the pump. At least swapping a pump in an XJ isn't as bad as a lot of vehicles. I had a buddy with a diesel pickup, and he had to hoist the entire cab off the frame to get to the fuel pump.

@nicholasshue1630 Год назад

Hello mark, is that an obd 1 cps or an obd 2? Mine looks like that, I’m just trying to figure out which one to order

@Mark_H_DIY Год назад

Like all 1996 and later vehicles, it's OBD2.

@nicholasshue1630 Год назад

@@Mark_H_DIY yes for the access itself for a code reader on the inside. But parts geek is giving me two different options to order my “style” of connector obd1 or obd2. Thanks for the reply

@Mark_H_DIY Год назад

I'm guessing your XJ is pre-1996 then (but I honestly don't know anything about their OBD configuration - sorry).

@richardrichard5409 6 месяцев назад

Quick n dirty check for CPS operation....the rev counter will give a slight kick when cranking if ok😎

@Mark_H_DIY 6 месяцев назад

Also great input. I suppose it would depend on the failure mode, as sometimes these things will work well enough to get the car started, but not keep it running very well.

@richardrichard5409 5 месяцев назад

@@Mark_H_DIY yes, they often fail when hot. I had a Mercedes that would breakdown at the same set of traffic lights three times day after day until, I managed to code read it at point of failure when still heat soaked😎

@Mark_H_DIY 5 месяцев назад

@@richardrichard5409 it's kinda funny how the CPS symptoms are pretty much the same across so many different vehicles.

@nu.supply8482 Год назад

how can voltage be dirty?

@Mark_H_DIY Год назад

"Dirty" is an old sparky term that's used to describe (for example) the 12 volts DC battery voltage with large, spiky voltage variation. In my case, this was caused by a bad rectifier in the alternator. The alternator actually makes AC (Alternating Current) instead of the DC (Direct Current) our cars use, but "filters it" from AC to DC with the rectifiers (and other parts, but let's keep it basic). When one or more of these rectifiers fails, the conversion to a nice, "clean" 12 volts isn't successful, and a large component of the original AC gets through to the car's electrical system. In my case, you could hear the results of this in the radio, AND it was enough to disrupt the operation of the CPS as well. Hope that helps...