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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1136 (Engine Cooling System) >> Diagnostic Information and Procedures >> After Boil Coolant Pump Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the FUEL COOL Relay.
  2. Ignition ON, verify that a test lamp illuminates between the relay switch ignition circuit and ground.
    • If the test lamp does not illuminate, test the relay switch ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay switch ignition circuit fuse is open, test the appropriate relay controlled output circuit for a short to ground. If the circuit tests normal, test or replace the relay.
  3. Connect a 10A fused jumper between the relay switch ignition circuit and the relay controlled output circuit. Verify the pump is activated
    • If the pump activates, test or replace the relay.
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