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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Automatic Transmission - 5ET50 (MKE)) >> Diagnostic Information and Procedures >> DTC P079A: Transmission Clutch 1 Slip Detected >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.
  1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling
    WARNING:

    Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

    The High Voltage Disabling procedure includes the following steps:

    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

    • Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
    • Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
      • Visually and functionally inspect the gloves before use.
      • Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

    Failure to follow the procedures may result in serious injury or death.

  2. Verify control solenoid valve assembly condition by performing the Control Solenoid Valve Inspection .
  3. Verify control solenoid valve assembly function by performing the Control Solenoid Valve Performance Test .
    • If a concern is found 

      Replace the Q8 Control Solenoid Valve.

    • If no concern is found 
  4. Inspect the a/trans fluid level control valve for stuck closed or damaged condition.
    • If you found a concern with the a/trans fluid level control valve 

      Replace the a/trans fluid level control valve.

    • If no concern is found 
  5. Inspect the valve body components and hydraulic circuits listed below for a leak or a stuck valve. Refer to Control Valve Body Diagnostic Inspection :
    • Control valve body spacer (w/gasket) plate assembly
    • Variable low clutch valve and variable low clutch accumulator.
    • If you found a concern in the valve body 

      Repair or replace the valve or valve body.

    • If no concern is found 
  6. Inspect the variable low clutch assembly snap ring, piston, clutch discs and housing for a slipping or damaged condition.
    • If you found a variable low clutch assembly concern 

      Repair or replace the variable low clutch assembly as necessary.

    • If no concern is found 
  7. Replace the T6 Power Inverter Module.
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