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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 256 (Automatic Transmission - 2ML70 - DTC P0969 To DTC P279D) >> DTC P1824, P182A-P182F, P1838, or P1839 >> 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. Disconnect the IMS harness connector at the control solenoid (w/body and TCM) valve assembly. Ignition ON. The scan tool IMS A/B/C/P parameter should display HI for all 4 signal circuits.
    • If a signal circuit displays LOW, replace the control solenoid (w/body and TCM) valve assembly.
  2. Connect a 3-amp fused jumper wire between each transmission range signal circuit at the control solenoid (w/body and TCM) valve assembly and ground. With a scan tool, ensure that each signal circuit displays LOW when connected to ground.
    • If a signal circuit remains HI when connected to ground, replace the control solenoid (w/body and TCM) valve assembly.
  3. Connect the IMS harness connector to the control solenoid (w/body and TCM) valve assembly. Disconnect the IMS connector. The scan tool IMS A/B/C/P parameter should display HI for all 4 signal circuits.
    • If a signal circuit displays LOW, replace the IMS jumper harness.
  4. Connect a 3-amp fused jumper wire between each transmission range signal circuit at the IMS connector harness and ground. With a scan tool, ensure that each signal circuit displays LOW when connected to ground.
    • If a signal circuit remains HI when connected to ground, replace the IMS harness.
    • If a signal circuit other than the circuit being grounded displays LOW, replace the IMS harness.
    • If all circuits test normal, replace the IMS.
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