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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2771) >> DTC P0562 or P0563 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine and observe the Ignition Voltage parameter with a scan tool. The Ignition Voltage parameter should be between 12-14.5 volts.
  2. Increase the engine speed to 1,500 RPM. The Ignition Voltage parameter should remain between 12-14.5 volts.
    • If the voltage is not within the specified range when the engine speed is increased, refer to Charging System Test .
  3. Turn OFF the ignition. Disconnect the TCM connector. Probe the battery positive voltage and the ignition 1 voltage circuits of the TCM connector with the ground probe of the DMM. Connect the positive lead of the DMM to the battery positive terminal. Turn ON the ignition, with the engine OFF. Measure the voltage drop for each circuit. The voltage drop should be less than 0.5 volts.
    • If the voltage drop is greater than 0.5 volts, repair the high resistance in the affected circuit.
  4. Turn OFF the ignition. Using the positive probe of the DMM, probe the ground circuits of the TCM connector. Connect the negative lead of the DMM to the battery ground terminal. Observe and record the voltage measurements. The voltage drop should be less than 0.2 volts.
    • If the voltage drop is greater than 0.2 volts, repair the open or high resistance in the affected circuit.
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