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Circuit/System Testing

SGCM Coolant Pump Malfunction 

  1. Ignition OFF, disconnect the harness connector at the SGCM coolant pump.
  2. Ignition ON, test for B+ between the B+ circuit terminal A and ground.
    • If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect a test lamp between the B+ circuit terminal A and the control circuit terminal B.
  4. Ignition ON, command the SGCM Coolant Pump Relay ON and OFF with a scan tool. The test lamp should turn On and OFF when commanded.
    • If the test lamp does not turn ON and OFF when commanded, test the control circuit for an open/high resistance. If the circuit tests normal, replace the SGCM.
  5. If all circuits test normal, test or replace the SGCM coolant pump
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