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Home >> Pontiac >> 2007 >> Vibe Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - DTC P0452 To DTC P2138 >> DTC P2125 >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 1:  The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
  2. 5:  This step tests the signal and the 5-volt reference circuits.
  3. 9:  This step tests for an open in the APP sensor 2 low reference circuit. The control module will receive a high voltage signal if the low reference circuit is open.
DTC P2125

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Powertrain Control Module Connector End Views  or  Engine Controls Connector End Views 
1  Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the APP Sensor 2 parameter with a scan tool.
Is the APP sensor 2 parameter less than the specified value?		 0.5 V Go to Step 5  Go to Step 3 
3 Is the APP sensor 2 parameter more than the specified value? 4.8 V Go to Step 9  Go to Step 4 
4
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 5  Go to Intermittent Conditions
5 
  1. Disconnect the accelerator pedal position (APP) sensor electrical connector.
  2. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the APP sensor 2 and the sensor input circuit.
  3. Observe the APP sensor 2 parameter on the scan tool.
 Is the APP sensor 2 voltage within the specified range?		 4.8-5.2 V Go to Step 12  Go to Step 6 
6 Connect a DMM between the 5-volt reference circuit of the APP sensor 2 and a good ground.
Is the measured voltage within the specified range?		 4.8-5.2 V Go to Step 7  Go to Step 8 
7 Test the APP sensor 2 input circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
8 Test the 5-volt reference circuit of the APP sensor 2 for an open circuit. Refer to Circuit Testing and Wiring Repairs .
 
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
9 
  1. Disconnect the APP sensor electrical connector.
  2. Connect a test lamp between the low reference circuit of the APP sensor 2 and B+.
  3. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?		 - Go to Step 10  Go to Step 11 
10 Test the input circuit of the APP sensor 2 for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
11 Test for an open in the low reference circuit of the APP sensor 2. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
12 Test for an intermittent and for a poor connection at the APP sensor 2. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 14 
13 Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
14 Replace the APP sensor 2. Refer to Accelerator Pedal Position Sensor Replacement .
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 16  -
16
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 17 
17 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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