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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1866 (Engine Controls And Fuel - 2.2L (L61) - DTC P0700 To DTC P2A01) >> DTC P2128 >> 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 number below refers to the step number on the diagnostic table.

  1. 2:  Any circuit faults on either APP sensor 1 or APP sensor 2 will set one of the DTCs listed. Refer to the appropriate table for diagnosis.
DTC P2128

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2  Observe the DTC information with a scan tool.
Is DTC P0641 or P0651 also set?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
3
  1. Turn the ignition OFF.
  2. Disconnect the accelerator pedal position (APP) sensor electrical connector.
  3. Disconnect the engine control module (ECM).
  4. Measure the resistance of the following circuits for each of the APP sensors with a DMM:
    • The low reference circuit
    • The signal circuit
    • The 5-volt reference circuit
Did any of the circuits measure more than the specified value?		 5 Ω Go to Step 7  Go to Step 4 
4 Test the signal circuit of the APP sensor 1 for a short to the signal circuit of the APP sensor 2. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 9  Go to Step 5 
5 Test for an intermittent and for a poor connection at the accelerator pedal harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 9  Go to Step 6 
6 Test for an intermittent and for a poor connection at the ECM harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 9  Go to Step 8 
7 Repair the high resistance in the circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 9  -
8 Replace the APP sensor. Refer to Accelerator Pedal Position Assembly Replacement .
Did you complete the replacement?		 - Go to Step 7  -
9
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 90 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 8 
10
IMPORTANT: Be aware that repairing one individual condition may correct more than one DTC.
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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