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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 P2138 >> 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. 2:  If there are any other APP sensor or any TAC system DTCs set, diagnose those DTCs first.
  3. 4:  This step tests the input circuit wiring and the PCM. If the scan tool displays approximately 5 volts, the PCM and input circuit are OK.
DTC P2138

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  Are any throttle actuator control (TAC) system or other accelerator pedal position (APP) sensor DTCs set? - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
3
  1. Turn the ignition ON, with the engine OFF.
  2. With the throttle closed, select the APP Sensor 1 parameter on the scan tool.
Is the APP Sensor 1 voltage within the specified value?		 0.75-0.85 V Go to Step 5  Go to Step 4 
4 
  1. Turn the ignition ON, with the engine OFF.
  2. With the throttle closed, select the APP Sensor 2 parameter on the scan tool.
Is the APP Sensor 2 voltage within the specified value?		 1.55-1.70 V Go to Step 8  Go to Step 7 
5
  1. Turn the ignition ON, with the engine OFF.
  2. With the throttle closed, select the APP Sensor 2 parameter on the scan tool.
Is the APP Sensor 2 voltage within the specified value?		 1.55-1.7 V Go to Step 6  Go to Step 10 
6
  1. Perform the scan tool Clear DTC Information function.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Freeze Frame conditions as specified.
Does DTC 2138 set?		 - Go to Step 3  Go to Intermittent Conditions
7
  1. Test for a short between the APP sensor 1 and APP sensor 2 signal circuits.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and repair a condition?		 - Go to Step 15  Go to Step 13 
8
  1. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the APP sensor 1 and the sensor signal circuit.
  2. Observe the APP sensor 1 parameter on the scan tool.
 Is the APP sensor 1 voltage within the specified range?		 4.8-5.2 V Go to Step 12  Go to Step 9 
9
  1. Test for the following conditions:
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 14 
10
  1. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the APP sensor 2 and the sensor signal circuit.
  2. 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 11 
11
  1. Test for the following conditions:
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 14 
12
  1. Test for an intermittent or a poor electrical connection at the APP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
  2. Repair as necessary.
Did you find and correct a condition?		 - Go to Step 15  Go to Step 13 
13 Replace the APP sensor. Refer to Accelerator Pedal Position Sensor Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 15  -
15
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC run and pass?		 - Go to Step 16  Go to Step 2 
16 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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