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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 P0722 or P0723 >> Circuit/System Testing

Circuit/System Testing

  1. Turn the ignition ON.
  2. Observe the transmission ISS/OSS supply voltage circuit status on the scan tool. The parameter should display OK.
    • If the parameter does not display OK, disconnect the ISS/OSS connector from the control solenoid (w/body and TCM) valve assembly and recheck the scan tool display.
    • If the transmission ISS/OSS supply voltage circuit status still displays OK, visually inspect the OSS, harness, connector, the control solenoid (w/body and TCM) valve assembly pins for metallic debris and output shaft machined surface for damage or misalignment.
    • Repair or replace the damaged components.
  3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test .
    • The scan tool Transmission OSS parameter should display 100-400 RPM.
    • If the Transmission OSS parameter is between 100-400 RPM, replace the ISS/OSS assembly.
    • If no OSS RPM is displayed or the parameter is out of range, replace the control solenoid (w/body and TCM) valve assembly.
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