Hydraulic Test
1. PREPARATIONa. Warm up the transmission fluid.
b. Remove the transmission case test plug and connect the hydraulic pressure gauge.
SST 09992-00093 Oil pressure gauge
CAUTION:
a. Perform the test at normal operating fluid temperature (50 - 80°C or 122 - 176°F).
b. The line pressure test should always be carried out in pairs. One should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is performing the test.
2. MEASURE LINE PRESSURE
a. Fully apply the parking brake and chock the four wheels.
b. Start the engine and check idling rpm.
c. Step down strongly on the brake pedal with your left foot and shift into D range.
d. Measure the line pressure when the engine is idling.
e. Press the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches approximately 1,700 rpm.
CAUTION: Release the accelerator pedal and stop test if the rear wheels begin to rotate. Usually the rear wheels begin to rotate when the engine speed (depending on the brake force) reaches approximately 1,800 - 1,900 rpm.
f. In the same manner, perform the test in R range.
Line Pressure Values:
g. If the measured pressures are not up to specified values, recheck the throttle cable adjustment and perform a retest.
3. EVALUATION
a. If the measured values at all ranges are higher than specified:
- Throttle cable out of adjustment
- Throttle valve defective
- Regulator valve defective
b. If the measured values at all ranges are lower than specified:
- Throttle cable out of adjustment
- Throttle valve defective
- Regulator valve defective
- Oil pump defective
- OD clutch defective
c. If pressure is low in the D range only:
- D range circuit fluid leakage
- Forward clutch defective
- OD clutch defective
d. If pressure is low in the R range only:
- R range circuit fluid leakage
- Direct clutch defective
- No.3 brake defective OD clutch defective