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Transmission and transfer case » AW-4 automatic transmission » Diagnosis and testing
Pressure test analysis

If pressures in D and Reverse are higher than specified in test, check for the following: ² throttle cable loose, worn, binding or out of adjustment ² throttle valve, downshift plug, throttle cam, or primary regulator valve are sticking, worn or damaged If pressures in D and Reverse are lower than specified in test, check for following:

  •  throttle cable loose, worn, binding or out of adjustment
  •  throttle valve, downshift plug, or throttle cam sticking, worn or damaged
  •  primary regulator valve sticking, worn, or damaged
  •  oil pump gears or housing worn, or damaged
  •  overdrive clutch worn, or damaged

If pressures are low in D range only, check for following:

  •  forward clutch worn or damaged
  •  fluid leakage in D range circuit (component seal and O-rings)

If pressures are low in Reverse only, check for following:

  •  shift cable and manual valve out of adjustment
  •  fluid leakage in reverse circuit (component seal and O-rings)
  •  direct clutch worn or damaged
  •  first/reverse brake worn or damaged
    More about «Diagnosis and testing»:

    General diagnosis information

    Effects of incorrect fluid level

    Causes of burnt fluid

    Fluid contamination

    Preliminary inspection and adjustment

    Manual shifting test

    Hydraulic pressure test

    Pressure test analysis

    Time lag test

    Test procedure

    Time lag test analysis

    Service diagnosis

    Transmission solenoid testing

    Park/neutral position switch

    Gearshift cable

    Throttle valve cable

    Speed sensor testing

    Flow testing transmission main cooler

    Torque converter stator clutch inspection

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