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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1375 (Engine Controls And Fuel - 6.6L - DTC P02E8 To DTC P1247) >> DTC P0545 or P0546 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Perform the Repair Verification after performing the Circuit/System Testing.
  1. Ignition OFF, disconnect the harness connector at the EGT sensor 1.
  2. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5 Ω between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify the scan tool EGT Sensor 1 parameter is greater than 998°C (1,828°F).
    • If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.
    4. NOTE: If a short to voltage is found on the EGT signal circuit, the 3A fuse in the jumper wire will open.
  4. Install a 3A fused jumper wire between the signal circuit terminal A and a good ground. Verify the scan tool EGT parameter is less than -35°C (-31°F).
    • If warmer than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the sensor.
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