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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 222 (Hybrid Engine Control System) >> Diagnostic Information and Procedures >> DTC P0A2B-P0A2D or P0A31-P0A33 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the transmission X176 24-way harness connector.
    2. IMPORTANT: The ignition must be ON to test the low reference circuit. Other DTCs will set with the X176 connector disconnected.
  2. Ignition ON, test the vehicle harness side for less than 8 ohms between the low reference circuit terminal 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 PIM.
  3. Ignition ON, verify the scan tool motor temperature sensor parameter is greater than 4.42V.
    • If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PIM.
  4. Install a 3-amp fused jumper wire between the signal circuit terminal and the low reference circuit terminal. Verify the scan tool motor temperature sensor parameter is less than 0.29V.
    IMPORTANT: If a short to voltage is found, test the motor temperature sensor for damage.
    • If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PIM.
  5. Connect the DT-48493  to the X176 transmission 24-way connector at the transmission. See Special Tools . Measure and record the resistance between the sensor signal and low reference terminals. Compare the actual sensor and circuit resistance to the expected sensor resistance. Refer to Temperature Versus Resistance .
    • If the resistance is near the expected value, test the transmission internal harness signal circuit for a short to ground. If the circuit tests normal, replace the drive motor w/generator.
    • If the resistance is not near the expected value, test the transmission internal harness signal and low reference circuits for an open or shorted together condition. If the circuits test normal, replace the drive motor w/generator.
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