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Home >> Pontiac >> 2008 >> G8 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0300 To DTC P1014 >> DTC P0660, P0661, or P0662 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the IMT solenoid.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
  3. Ignition OFF, connect a test lamp between the control circuit terminal 2 and the ignition voltage circuit terminal 1.
    4. NOTE: The control circuit for the IMT solenoid is pulled-up to voltage within the ECM, 2.0-3.0 volts on the control circuit is normal.
  4. Ignition ON, command the IMT solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF.
    • If the test lamp remains ON all the time, test for a short to ground on the control circuit. If circuit/connections test normal, replace the ECM.
    • If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the control circuit. If circuit/connections test normal, replace the ECM.
  5. Test for 2.0-3.0 volts between the control circuit terminal 2 and ground.
    • If the voltage is not within the specified range, replace the ECM.
  6. If all circuits/connections test normal, replace the IMT solenoid.
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