This is on my Father's 2001 WJ Laredo with a 4.0L. Current status: Light turns on and stays on until you press set, the light goes off soon after that and will not on again until you shut off and start the jeep.
I have gone more in-depth than any of the threads I have found, but still have not nailed down the problem. My current questions I am trying to answer are in bold below.
Steering wheel switches: Unplugged the C3 connector from the PCM, and used a multimeter to measure the switch resistances between Pin 32 of the connector and ground. Cannot find what proper numbers are for this (not listed in FSM for WJs), but I think it's good all the numbers are different and non-0
- On/Off 459 Ohms
- Set: 4300 Ohms
- Res/Accel 15,400 Ohms
- Cancel: 1,220 Ohms
- Coast 2,920 Ohms
Brake pedal Switch: At C3 connector pins 11 and 24, I verified resistance when brake pedal is pressed (I think 20kOhm) and ~0 when pedal is not pressed.
Vacuum Lines: Vacuum lines appear to be in good condition. After not running the car for a few hours, there was still vacuum in the hoses when I removed the CC servo for testing
CC Servo: Removed unit and pushed on the vacuum diaphragm(where the cable connects), moves smoothly, I am not sure how hard it to should be to compress but it seemed sort of reasonable and it rebounds on its own. Vacuum soleoid (center) moves with 5V. Other two solenoids (vent and dump) will not move with 5V but will move with 6V. Not sure what voltage they are supposed to move at, it is not listed anywhere. Reinstalled solenoid servo and tested it by applying a 9V DC signal to connector C3 Pin 11 and grounding to the frame and could hear multiple solenoids clicking in the CC unit. Tried applying a vacuum with a manual pump, then actuating the solenoids. There was a little tension of the cable, but it quickly lost the vacuum I built with the pump so it relaxed. Does this mean that my solenoid unit is leaking and needs replaced?
Cable: Cable is connected but seems to have a significant amount of slack in it. Tested by placing a camera and flash light under the hood while driving. There appeared to be tension in the cable for a brief moment when pressing the set button, but it quickly slackened, I will try to post the video tomorrow. Cable may be too long?
I will measure the amount that sticks past the throttle connecter in the morning, can someone with a working CC help me out by measuring theirs for comparison?