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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0971 >> DTC P0851 or P0852 >> Component Testing

Component Testing

  1. Ignition OFF, transmission in Park or Neutral, disconnect the transmission 16-way connector and the IMS from the control solenoid (w/body and TCM) valve assembly.
  2. Test for infinite resistance between the control solenoid (w/body and TCM) valve assembly 16-way connector pin 3 and the IMS connector pin on the control solenoid (w/body and TCM) valve assembly side with the switch in the Open position.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the control solenoid (w/body and TCM) valve assembly.
  3. Test for infinite resistance between the IMS connector pin F and the IMS case ground with the switch in the Open position.
    • If not the specified value, replace the IMS.
  4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
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