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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1865 (Engine Controls And Fuel - 3.5L (L66) - DTC P0506 To DTC P2199) >> DTC P2138 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in 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:  This step determines if a fault is current.
  3. 3:  This step tests the circuits of the APP sensor throughout its range of motion. A condition may not be present with the throttle in the closed position. Working the APP through its complete range may reveal an intermittent condition.
  4. 4:  A high resistance in any of the APP circuits will cause this DTC to set. Test any circuit that measured more than the specified value for a high resistance.
  5. 5:  This step tests the signal circuits of the APP sensors for a wire to wire short.
DTC P2138

Step Action Value(s) 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. Leave the ignition ON for 30 seconds.
  3. Observe the DTC information with a scan tool.
Did the DTC fail this ignition?		 - Go to Step 4  Go to Step 3 
3 
  1. Clear the DTC information with a scan tool.
  2. Observe the DTC information with a scan tool.
  3. Slowly depress the accelerator pedal to wide open throttle (WOT), then slowly return the accelerator pedal to the closed position.
  4. Repeat this action several times.
Did the DTC fail this ignition?		 - Go to Step 4  Go to Intermittent Conditions
4 
  1. Turn OFF the ignition.
  2. Disconnect the accelerator pedal position (APP) sensor connector.
  3. Disconnect the powertrain control module (PCM).
  4. Measure the resistance of the following circuits with a DMM for each APP sensor:
    • The signal circuit
    • The 5-volt reference circuit
    • The low reference circuit
Is the resistance more than the specified value for any circuit?		 5 Ω Go to Step 8  Go to Step 5 
5  Test the signal circuit of APP sensor 1 for a short to the signal circuit of APP sensor 2. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
6 Test for an intermittent and for a poor connection at the APP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
7 Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
8 Repair the high resistance in the APP circuit that measured above the specified value. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 10  -
9 Replace the APP sensor. Refer to Accelerator Pedal Position Sensor Replacement .
Did you complete the replacement?		 - Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Start the engine.
  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 2  Go to Step 11 
11 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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