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Jerry, Master Mechanic
Category: Dodge
Satisfied Customers: 1754
Experience:  ASE Master tech, 30 years exp. troubleshooter, driveability tech
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2005 durango 4.7 p0123 tps high, 4.77 volts signal return

Customer Question

2005 durango 4.7 p0123 tps high
JA: Are you fixing your Durango yourself? What have you tried so far?
Customer: 4.77 volts signal return wire pin2 yellow green any time KOEO at tps connector unplugged. unpin from PCM pin 21 loose voltage. installed new pcm no change, new TPS no change. Unplug MAP, Crank sensor (share 5 volt ref.) Just changed jobs and lost access to Identifix. Backfeed of another sensor?? in transmission. code will not hard set in TCM with scanner but is hard set in both PCM's
JA: Does the vehicle stall at low speeds? Does it sputter?
Customer: no only a loooong crank unless key is left in run position for 10 sec then has a normal start.
JA: Anything else you want the mechanic to know before I connect you?
Customer: tried the horn relay with no change
Submitted: 6 months ago.
Category: Dodge
Expert:  Amedee replied 6 months ago.

Hello and welcome!

My name isCustomerand I can assist you with your question.

Expert:  Amedee replied 6 months ago.

Did you still need help?

Can I start by getting your VIN?

Thank you!

Customer: replied 6 months ago.
Expert:  Amedee replied 6 months ago.

Thank you for that information.

Are you saying the 5 volt reference is not sufficient at the TPS?

Customer: replied 6 months ago.
no i have 5.02 volts at tps for the reference voltage. the signal return has 4.77 volts at all times KOEO
Customer: replied 6 months ago.
Customer: replied 6 months ago.
Unpin only pin 21 at PCM and will loose all voltage at signal return at tps connector. Still have 5 volt reference at tps connector
Expert:  Amedee replied 6 months ago.

What color wire are you checking for the return signal?

Customer: replied 6 months ago.
Pin 2 yellow Green at tps pin 21 connector 2 at PCM
Expert:  Amedee replied 6 months ago.

Are you testing this with the connector plugged into the TPS or unplugged?

Customer: replied 6 months ago.
Tps both backprobed and also disconnected. The pcm is sending a 4.77 voltage signal?? PCM data shows 4.96 volts.
Expert:  Amedee replied 6 months ago.

The PCM should be sending 4.77 volts on this circuit. This is normal.

However, the signal voltage should change when the connector is plugged into the TPS and as the throttle plate is moving

Customer: replied 6 months ago.
Verified good grounds 17 ohms. Also verify 5 volt reference and signal return voltages using ground wire at tps
Expert:  Amedee replied 6 months ago.

Would you be willing to speak on the phone?

Customer: replied 6 months ago.
I really don't want to pay the $26 to talk on the phone sorry I am going to reccheck signal return on pin 2 back probed while moving throttle. Maybe I have a defective tps. I know they are a high fail part on these. This is the second one in 108k miles
Expert:  Amedee replied 6 months ago.

How about if I lower the cost to $10 for a phone call?

Customer: replied 6 months ago.
It is fixed. Ohm check pins 1 and 2 at tps sensor it was an open circuit. Bad sensor out of the box with the same problem as the failed one. Double guessed myself and followed the wrong path. Returned and installed warranty tps with no other concerns at this time.
Expert:  Amedee replied 6 months ago.

Glad to hear it is all fixed!