Engine/Transmission (1998.5 - 2002) Engine light comes on& truck shuts down

[jhinkle]

I have a problem about once a week sometimes it will go for a month before it happens again. The engine will shut down to idle for about 3 to 5 sec. then pick back up & run good the engine check light comes on. I have changed fuel filter don`t help. Has anybody had this problem before if so what is it,need help!!

 

[DCTECH]

You need to check for codes, but sounds like your APPS(throttle position sensor) is going bad. If it has a open circuit it will cause engine only to idle and will trip the check engine lamp.

 

[Bratton]

It could be a bad Engine control module. Mine failed suddenly and defueled the engine to idle only. It also made the engine look like it was overheating. In my case the failure was total. It would allow normal operation for a few seconds and then defuel. Check engine light came on too.

 

[ToolManTimTaylor]

Could very well be the apps voltage dropping out. The FAQ section has a method to check it out.

 

[ToolManTimTaylor]

A two person test with a meeter will show smooth voltage transitions .. NO Dropouts.

Originally posted by wtrenholm

APPS sensor used 6 wires, three for the actual pedal position and 3 for idle validation switches.



For the pedal position: (Test with key on)



DB/WT is the 5V supply for the sensor

Should be 5V



BK/YL is the sensor ground

Should be very low voltage drop, put black meter lead on batt negative and red meter lead on sensor ground.



LB/BK is the sensor return and votlage will vary with pedal

Mine is (using a scan tool)

idle = . 42V

WOT = 3. 61v



At . 52V the DRB read 1% open and at 3. 40 was 100%. Your truck may have slightly different values as it should be based on what your minimum APPS voltage is. If I remember right, it's typically 3V above min V for 100%. (Which is real close on my truck).

 

[jhinkle]

Thanks brothers I will check this out and get some codes and see what comes up.