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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 141 (Engine Controls And Fuel - 2.0L - DTC P0700 To DTC P2544) >> DTC P2122, P2123, P2127, P2128, or P2138 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the fuse that supplies B+ to terminal 56 X2 of the ECM.
  2. Disconnect the harness connector at the Accelerator Pedal Assembly.
  3. Test for less than 5 Ω between the appropriate low reference circuit listed below and ground.
    • APP sensor 1 terminal 4
    • APP sensor 2 terminal 5
    • If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit/connections test normal, replace the Engine Control Module.
  4. Install the fuse that supplies B+ to terminal 56 X2 of the ECM.
    5. NOTE: The 5 V reference circuit voltage can be within the specified range with a high resistance in the circuit. If this condition is suspected, refer to Diagnostic Aids .
  5. Ignition ON, test for 4.8-5.2 V between the appropriate 5 V reference circuit listed below and ground.
    • APP sensor 1 terminal 2
    • APP sensor 2 terminal 1
    • If less than the specified range, test the 5 V reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the Engine Control Module.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit/connections test normal, replace the Engine Control Module.
  6. Observe the scan tool APP sensor 1 voltage parameter. Verify the voltage is less than 0.3 V.
    • If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit/connections test normal, replace the Engine Control Module.
  7. Observe the scan tool APP sensor 2 voltage parameter. Verify the voltage is less than 0.3 V.
    • If greater than the specified range, test the signal circuit terminal 6 for a short to voltage. If the circuit/connections test normal, replace the Engine Control Module.
  8. Connect a 3 A fused jumper wire between the APP sensor 1 signal circuit terminal 3 and the 5 V reference circuit terminal 2. Verify the APP sensor 1 voltage parameter is greater than 4.8 V.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the Engine Control Module.
  9. Connect a 3 A fused jumper wire between the APP sensor 2 signal circuit terminal 6 and the 5 V reference circuit terminal 1. Verify the APP sensor 2 voltage parameter is greater than 4.8 V.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the Engine Control Module.
  10. If all circuits/connections test normal, test or replace the Accelerator Pedal Assembly.
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