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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1378 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L, 6.2L - DTC P069E To DTC P3449) >> DTC P1682 >> 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.
IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Ignition OFF, disconnect the powertrain relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the powertrain relay controlled output circuit terminal and ground.
    • If the test lamp illuminates, test he powertrain relay controlled output circuit for a short to voltage.
  3. Ignition OFF, verify that a test lamp illuminates between the powertrain relay coil voltage supply circuit terminal and ground.
    • If the test lamp does not illuminate, test the powertrain relay coil voltage supply circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the powertrain relay switch voltage supply circuit terminal and ground.
    • If the test lamp does not illuminate, test the powertrain relay switch voltage supply circuit for an open/high resistance.
  5. Disconnect the ECM.
  6. Ignition ON, verify that a test lamp illuminates between ECM connector terminal X1-19 and ground.
    • If the test lamp does not illuminate, test the ignition 1 relay controlled output circuit for a short to ground or open/high resistance.
    • If the circuit tests normal and its fuse is open, replace the ECM.
  7. Ignition OFF, connect the harness connector at the ECM.
  8. Ignition ON, connect a jumper wire between the powertrain relay voltage supply circuit terminal and the powertrain relay controlled output circuit terminal. Verify the EC Ignition Relay Feedback parameter indicates battery positive voltage.
    • If not the specified value, test the powertrain relay controlled output circuit for a short to ground or an open/high resistance. If the circuit tests normal and its fuse is open, replace the ECM.
  9. If all circuits test normal, replace the powertrain relay.
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