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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 24-way inline harness connector, then the transmission 16-way in line harness connector at the transmission, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 12 and ground.
    • If the test lamp illuminates, test the IGN voltage circuit for a short to voltage.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 12 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 replace the control solenoid (w/body and TCM) valve assembly.
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