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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0722 or P0723 >> Circuit/System Testing

Circuit/System Testing

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    NOTE:

    You must perform the Circuit/System Verification first.

  1. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
  2. Connect the DT-47825-10  jumper harness between the vehicle wire harness electrical connector and the Q8 control solenoid valve assembly electrical connector.
  3. Ignition ON, test for 8.3-9.3 volts between the ISS/OSS voltage circuit terminal B on the Q8 control solenoid valve assembly and ground at the transmission case.
    • If not between 8.3-9.3 volts 

      Replace the Q8 control solenoid valve assembly.

    • If between 8.3-9.3 volts 
  4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test .
    • If the Q8 control solenoid valve assembly does not pass the ISS/OSS test 

      Replace the Q8 control solenoid valve assembly.

    • If the Q8 control solenoid valve assembly passes the ISS/OSS test 
  5. Inspect the machined teeth on the 1-2-3-4 and 3-5 clutch housing outer surfaces for damage or misalignment.
    • If the machined surfaces are incorrect, damaged, or improper alignment 
    • If the machined surfaces and alignment checks OK 
  6. Replace the B14A/B14C ISS/OSS assembly.
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