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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (Engine Controls And Fuel - 2.2L - DTC P0351 To DTC P2544) >> DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the accelerator pedal.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminals listed below and ground.
    • Low reference circuit terminal A
    • Low reference circuit terminal D
    • If greater than the specified range, test the appropriate low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5-volt reference circuit terminals listed below C and F and ground.
    • 5 volt reference circuit terminal C
    • 5 volt reference circuit terminal F
    • If less than the specified range, test the appropriate 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the control module.
    • If greater than the specified range, test the appropriate 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the control module.
  4. verify the scan tool APP sensor 1 and 2 voltages are less than 0.3 V.
    • If greater than the specified range, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the ECM.
      • APP sensor 1 signal circuit terminal E
      • APP sensor 1 signal circuit terminal B
  5. Install a 3 A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal C. Verify the appropriate APP sensor voltage parameter is greater than 4.8 V.
    • APP sensor 1 signal circuit terminal E
    • APP sensor 1 signal circuit terminal B
    • If less than the specified range, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all circuits test normal, replace the accelerator pedal assembly.
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