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Home >> Chevrolet >> 2012 >> Cruze LS, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> DTC P0597-P0599 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the E41 Engine Coolant Thermostat Heater.
  2. Ignition ON, verify that a test lamp illuminates between the Ignition circuit terminal 2 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, replace the K20 Engine Control Module.
  3. Verify that a test lamp does not illuminate between the low reference circuit terminal 1 and ground.
    • If the test lamp illuminates, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
  5. Test for infinite resistance between the control circuit terminal 43 X1 and ground.
    • If less than the specified value, test the control circuit for a short to ground.
  6. Test for less than 5 Ω between the control circuit terminal 43 X1 at the K20 Engine Control Module harness connector and terminal 1 at the E41 Engine Coolant Thermostat Heater harness connector.
    • If greater than the specified value, test the control circuit for an open/high resistance.
  7. If all circuits test normal, replace the E41 Engine Coolant Thermostat Heater.
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