Next we need to check the harness for a short to power or a short to ground between the following terminals:
ECM terminal 91 and APP sensor terminal 4
ECM terminal 47 and electronic throttle control actuator terminal #1
If these check out, the next thing that needs checked is the TPS.
To do this, reconnect all wiring. Turn the key on and place the trans selector in D. Check voltage between the ECM terminals 50 and 69 (TP sensor 1 and 2) and ground. You should see the following readings:
Terminal 50 = Throttle fully released should be more than 0.36v
Throttle fully depressed should be less than 4.75v
Terminal 69 = Throttle fully released should be less than 4.75v
Throttle fully depressed should be more than 0.36v
If this doesn't work, try the relearn for the TP sensor, Do the following and then retry.
Make sure the throttle is fully released.
Turn the key on and then off and wait at least 10 seconds.
NOTE: Make sure the throttle valve moves during this 10 seconds by listening and confirming an operating sound.
Let me know what you find. There are still many more checks to go through. The ones we still need to cover will be based on what you find with these. I have attached a schematic of the APP wiring system to help guide you.
Wednesday, July 23rd, 2014 AT 7:17 PM