LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 365 (Engine Controls And Fuel - Hybrid (LZ1) - DTC P0351 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> DTC P0351-P0358 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    A high resistance on any IC circuit can cause a misfire condition before DTCs P0351-P0358 set.

  1. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.
  2. Ignition OFF, all vehicle systems OFF, it may take up to 2 minutes for all the systems to power down, test for less than 5 Ω between the ground circuit terminal A and ground.
    • If greater than the specified range, repair the ground circuit for an open/high resistance.
  3. Ignition OFF, test for less than 5Ω 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.
  4. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
  5. Engine idling at operating temperature, test for 0.200-0.500 V between the appropriate ignition control circuit terminal C and ground.
    • If less than the specified range, test the ignition control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the ignition control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. If all circuits test normal, test or replace the T8 ignition coil.
scientia non olet · About LEMON Manuals