Need help with Accelerator position sensor RELEARN
01-23-2013, 09:55 AM
#1
Thread Starter
Join Date: 01-23-2013
Location: Louisville, KY
Posts: 5
Need help with Accelerator position sensor RELEARN
My new/used HHR threw out a "Reduced Engine Power" Message today and contained a P2138 Code. I had minimal power driving home but made it back ok.
After checking the wiring harness in the engine compartment (Visually Checked good ), I started fooling around under the dash, specifically the wires going into the pedal. After prodding around I seemed to make things worse. Now when I start the vehical, the idle is high (around 1800rpm). If I floor it, the Rpms climb for a brief second then drops straight to idle. I have no accelerator response what so ever afterwards unless I restart the car.
I now have 4 codes that are all pertaining to the accelerator position sensor (Gas pedal) All being high AND low voltage correlation and believe I have narrowed it down to it actually being bad.
If I go buy a new pedal, does anyone now the procedure to relearn the sensor? I did this once to my Infinity but am sure the sequence is different.
Any help or alternative insight would be greatly appreciated!
After checking the wiring harness in the engine compartment (Visually Checked good ), I started fooling around under the dash, specifically the wires going into the pedal. After prodding around I seemed to make things worse. Now when I start the vehical, the idle is high (around 1800rpm). If I floor it, the Rpms climb for a brief second then drops straight to idle. I have no accelerator response what so ever afterwards unless I restart the car.
I now have 4 codes that are all pertaining to the accelerator position sensor (Gas pedal) All being high AND low voltage correlation and believe I have narrowed it down to it actually being bad.
If I go buy a new pedal, does anyone now the procedure to relearn the sensor? I did this once to my Infinity but am sure the sequence is different.
Any help or alternative insight would be greatly appreciated!
01-23-2013, 02:30 PM
#3
Thread Starter
Join Date: 01-23-2013
Location: Louisville, KY
Posts: 5
Just spoke with my local Chevy dealer here in Louisville and was told that the new pedal does not need to be programmed. Whether this is correct or not is yet to be discovered.
Now, does anyone have a wiring diagram of the harness under the dash. More specifically, that of the 6 wires that enter the APPS. I need to know which wires are the signal and which are the 5 volt power and ground.
I'm determined to locate the electrical gremlin without towing into the dealer
Now, does anyone have a wiring diagram of the harness under the dash. More specifically, that of the 6 wires that enter the APPS. I need to know which wires are the signal and which are the 5 volt power and ground.
I'm determined to locate the electrical gremlin without towing into the dealer
01-23-2013, 03:30 PM
#4
Founding Member
Join Date: 11-23-2007
Location: Texas
Posts: 8,210
They are correct on no programming for the pedal/sensor replacement.
By your own words your probing has caused more issues. Maybe it's time to get it to a certified tech. This sensor could cause a stuck accelerator and then crash or injury.
By your own words your probing has caused more issues. Maybe it's time to get it to a certified tech. This sensor could cause a stuck accelerator and then crash or injury.
01-23-2013, 03:55 PM
#5
Thread Starter
Join Date: 01-23-2013
Location: Louisville, KY
Posts: 5
Not driving it at all till it's fixed.. I believe it to be the APPS harness that may actually be bad. The plug end is known to make bad connections via chevy bulletin. To test this theory, I need access to the APP schematics and the Engine Control Module Connector End Views. I don't know which of the 6 wires is what.
The Info I currently have is the following
ECM Connector Function Pin Circuit No.
C2 Throttle Position Sensor 1 Signal 58 485
C2 Throttle Position Sensor 2 Signal 36 486
C2 Low Reference 29 1704
C2 Low Reference 31 2752
C2 5 Volt Reference 24 2701
C2 5 Volt Reference 26 1688
The Info I currently have is the following
ECM Connector Function Pin Circuit No.
C2 Throttle Position Sensor 1 Signal 58 485
C2 Throttle Position Sensor 2 Signal 36 486
C2 Low Reference 29 1704
C2 Low Reference 31 2752
C2 5 Volt Reference 24 2701
C2 5 Volt Reference 26 1688
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