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In this video I show the steps and procedures necessary to replace and diagnose alternator on the Chevy Silverado. These seizures or work on a GMC Sierra. GMC Yukon. GMC Yukon XL. I don’t like Escalade. And she had an ea in this video I show the steps and procedures necessary to replace and diagnose alternator on a Chevy Silverado. The procedures will work on a GMC Sierra. GMC Yukon. GMC Yukon XL. Chevrolet Tahoe. I hope this video helps you out, if it has please like and subscribe. shown below are the 5 different charging modes the ecu can put the charging system into. If you have any questions please feel free to leave something in the comment section. Thank you.
High Amp for Denali and SLE 170 AMP
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Standard 150 Amp
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Battery Sulfation Mode
The BCM will enter this mode when the interpreted generator output voltage is less than 13.2 V
for 45 minutes. When this condition exists the BCM will enter Charge Mode for 2-3 minutes. The
BCM will then determine which mode to enter depending on voltage requirements.
Charge Mode
The BCM will enter Charge Mode when ever one of the following conditions are met.
• The wipers are ON for more than 3 seconds.
• GMLAN (Climate Control Voltage Boost Mode Request) is true, as sensed by the HVAC
control head. High speed cooling fan, rear defogger and HVAC high speed blower operation
can cause the BCM to enter the Charge Mode.
• The estimated battery temperature is less than 0°C (32°F).
• Battery State of Charge is less than 80 percent.
• Vehicle speed is greater than 145 km/h (90 mph)
• Current sensor fault exists.
• System voltage was determined to be below 12.56 V
When any one of these conditions is met, the system will set targeted generator output voltage to
a charging voltage between 13.9-15.5 V, depending on the battery state of charge and estimated
battery temperature.
Fuel Economy Mode
The BCM will enter Fuel Economy Mode when the estimated battery temperature is at least 0°C
(32°F) but less than or equal to 176 degrees, the calculated battery current is less than 15
amperes and greater than −8 amperes, and the battery state-of-charge is greater than or equal
to 80 percent. Its targeted generator output voltage is the open circuit voltage of the battery
can be between 12.5-13.1 V. The BCM will exit this mode and enter Charge Mode when any of the
conditions described above are present.
Headlamp Mode
The BCM will enter Headlamp Mode when ever the headlamps are ON (high or low beams).
Voltage will be regulated between 13.9-14.5 V.
Start Up Mode
When the engine is started the BCM sets a targeted generator output voltage of 14.5 V for 30
seconds.
Voltage Reduction Mode
The BCM will enter Voltage Reduction Mode when the calculated ambient air temperature is above
0°C (32°F). The calculated battery current is less than 1 ampere and greater than −7 amperes,
and the generator field duty cycle is less than 99 percent. Its targeted generator output voltage is
12.9 V. The BCM will exit this mode once the criteria are met for Charge Mode.
16 окт 2024