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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

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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