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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 257 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0973 To DTC P2764) >> DTC P1825 or P1915 >> Circuit/System Testing

Circuit/System Testing

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  1. Disconnect the IMS 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 four signal circuits.
    • If a signal circuit displays LOW, the control solenoid (w/body and TCM) valve assembly is faulty.
  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 ensuring the signal circuit displays LOW when connected to ground.
    • If a signal circuit remains HI when connected to ground, the control solenoid (w/body and TCM) valve assembly is faulty.
    • If the above two tests indicate correct TCM functions, the IMS is faulty.
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