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Home >> Saturn >> 2007 >> Sky Red Line, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls & Fuel - 2.0L - DTC P2097 To P2310 >> DTC P2127 or P2128 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, disconnect the accelerator pedal harness connector at the accelerator pedal. Allow sufficient time for the ECM to power down.
  2. Test for less than 3 ohms of resistance between the low reference circuit terminal A and ground.
    • If greater than 3 ohms, test the 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 volts between each 5-volt reference circuit terminal C and ground.
    • If less than 4.8 volts, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the control module.
    • If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the control module.
  4. Ignition ON, verify the scan tool APP sensor 2 voltage is less than 0.1 volt.
    • If greater than 0.1 volts, test the APP sensor 2 signal circuits terminal B for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C of the APP sensor 2, and verify that the APP sensor 2 voltage is greater than 4.8 volts.
    • If less than 4.8 volts, test the APP sensor 2 signal circuit for an open/high resistance, or short to ground. If the circuit tests normal, replace the control module.
  6. If all circuits test normal, replace the accelerator pedal.
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