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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 490 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P181C-P181F, P183A-P183E, P184A, or P184B >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF. Disconnect the X176 24-way harness connector at the transmission. Additional DTCs may set.
  2. Install the DT-48493  jumper harness to the harness side only.
  3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 Ω between the low reference circuit terminal 5 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 T6 drive motor generator power inverter module.
  4. Ignition ON, verify each scan tool D1/D2/R1/R2 parameter displays high.
    • If any parameter displays low, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the T6 drive motor generator power inverter module.
    • Parameter D1 - terminal 3
    • Parameter D2 - terminal 4
    • Parameter R1 - terminal 1
    • Parameter R2 - terminal 2
  5. Install a 3 A fused jumper wire between each terminal listed below one at a time and ground. Verify each scan tool D1/D2/R1/R2 parameter displays low when grounded.
    • If a parameter displays high when grounded, test the signal circuit terminal listed below for a short to voltage or an open/high resistance. If the circuit tests normal, replace the T6 drive motor generator power inverter module.
    • Parameter D1 - terminal 3
    • Parameter D2 - terminal 4
    • Parameter R1 - terminal 1
    • Parameter R2 - terminal 2
  6. Ignition OFF, disconnect the X1 16-way harness connector at the transmission.
  7. Install the DT-47825-10  jumper harness to the harness side only.
  8. Ignition ON, verify the scan tool S parameter displays high.
    • If the S parameter displays low, test the signal circuit terminal 3 X1 for a short to ground. If the circuit tests normal, replace the T6 drive motor generator power inverter module.
  9. Install a 3 A fused jumper wire between the signal terminal 3 X1 and ground. Verify the scan tool S parameter is low.
    • If the S parameter displays high, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the T6 drive motor generator power inverter module.
  10. If the circuits test normal, test or replace the transmission internal extension harness or the automatic transmission B15 internal mode switch.
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