Saturn Ion 3 throttle snsor

Tiny
EDS
  • MEMBER
  • 2006 SATURN ION
  • 4 CYL
  • 2WD
  • MANUAL
  • 83,000 MILES
Have saturn Ion 3 computor says throttle positioning sensor bad, changing throttle pedal doesn't fix problem. Saturn dealer replaced all wiring harness said that would take care of problem. Did for about 1 year now problem back. New pedal doesn't fix problem after a few hours light goes off again. Have found out that with cold weather light doesn't go on and everthing works fine until weather gets around 40 degrees than light goes on again. Lost at what to try next because mech. Says computor doesn't how any other codes. But 6038 I think that was the code it shhowed for thorottle sensor
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Thursday, January 20th, 2011 AT 7:03 PM

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Tiny
SATURNTECH9
  • EXPERT
I need the exact code number it will be a letter then a four digit number. If you get me the code number it will be a lot easier to help you.
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Friday, January 21st, 2011 AT 2:40 AM
Tiny
SATURNTECH9
  • EXPERT
EDs says>code on saturn 2006 P2138 question.
Saturntech9 says>From now on you need to post all your replies on this question it get's confusing for everyone if you start another question to post a reply for this one. Here is the code description I posted the trouble tree for the code too. You will need a scan tool that can read read the pedal position sensor's etc.
DTC P2138

CIRCUIT DESCRIPTION
The accelerator pedal position (APP) sensors 1 and 2 are located within the accelerator pedal assembly. Each sensor has the following circuits:

* A 5-Volt reference circuit
* A low reference circuit
* A signal circuit

This provides the engine control module (ECM) with a signal voltage proportional to accelerator pedal movement. The APP sensor 1 signal voltage at rest position is near the low reference and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position is near the 5-Volt reference and decreases as the pedal is actuated.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P2138 Accelerator Pedal Position (APP) Sensor 1-2 Correlation

CONDITIONS FOR RUNNING THE DTC

* The battery voltage is more than 5.23 volts.
* DTCs P0641, P0651, P2120, P2125 are not set.
* The accelerator pedal is leaving the idle position.
* DTC P2138 runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC

* The voltage difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value.
* The above condition is met for more than 2 seconds.

ACTION TAKEN WHEN THE DTC SETS

* The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
* The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records.
* The control module commands the TAC system to operate in the Reduced Engine Power mode.
* A message center or an indicator displays Reduced Engine Power.
* Under certain conditions the control module commands the engine OFF.

CONDITIONS FOR CLEARING THE MIL/DTC

* The ECM turns OFF the MIL after 3 consecutive drive trips that the diagnostic runs and does not fail.
* A History DTC clears after 40 consecutive warm up cycles in which no failures are reported by this diagnostic or any other emission related diagnostic.
* The scan tool clears the MIL/DTC.

DIAGNOSTIC AIDS

* The ECM compares the signal of each of the APP sensor to each other throughout the entire range of operation. Clear the DTCs and actuate the pedal through the entire range with the ignition ON and the engine OFF.
* Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector. Using this kit will prevent damage to the harness connector terminals.
* For intermittent conditions, refer to Testing for Intermittent Conditions and Poor Connections. See: Diagrams Diagnostic Aids

TEST DESCRIPTION

Step 1 - Step 8

The number below refers to the step number on the diagnostic table.

2. Any circuit faults on either APP sensor 1 or 2 will set one of the DTCs listed. Refer to the appropriate table for diagnosis.
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Friday, January 21st, 2011 AT 5:42 PM

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