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Home >> Saturn >> 2010 >> Sky Red Line, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 2.4L - 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 variant/trim than selected.
  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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