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Jeep Cherokee
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Transmission and transfer case » AW-4 automatic transmission » Diagnosis and testing
Effects of incorrect fluid level

A low fluid level allows the pump to take in air along with the fluid. Air in the fluid will cause fluid pressures to be low and develop slower than normal.

Preliminary Diagnosis Check Procedure
Preliminary Diagnosis Check Procedure

If the transmission is overfilled, the gears churn the fluid into foam. This aerates the fluid and causing the same conditions occurring with a low level. In either case, air bubbles cause fluid overheating, oxidation and varnish buildup which interferes with valve, clutch and servo operation. Foaming also causes fluid expansion which can result in fluid overflow from the transmission vent or fill tube. Fluid overflow can easily be mistaken for a leak if inspection is not careful.

    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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