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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 786 (Engine Controls And Fuel - 2.0L - DTC P2088 To DTC P2310) >> DTC P2122 or P2123 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, 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 low reference circuit terminal D 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 the 5-volt reference circuit terminal F 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 1 voltage is less than 0.1 volt.
    • If greater than 0.1 volt, test the APP sensor 1 signal circuit terminal E 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 E and the 5-volt reference circuit terminal F of the APP sensor 1, and verify the APP sensor 1 voltage is greater than 4.8 volts.
    • If less than 4.8 volts, test the APP sensor 1 signal circuit for an open, 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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