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Home >> Chevrolet >> 2012 >> Camaro ZL1, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls/Fuel - 6.2L - DTC P0010 To DTC P0340 >> Diagnostic Information and Procedures >> DTC P023A >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the KR18 charge air cooler coolant pump relay.
  2. Verify that a test lamp illuminates between the coil ignition circuit terminal 85 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the relay.
  3. Connect a test lamp between the coil ignition circuit terminal 85 and the relay control circuit terminal 86.
  4. Command the Charge Air Cooler Coolant Pump ON and OFF with a scan tool. The test lamp should turn ON and OFF.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control module.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  5. If all circuits test normal, test or replace the KR18 charge air cooler coolant pump relay.
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