5A
Stall Test
This test is to check overall performance of automatic transmission and engine by measuring stall speed at “D” and “R” ranges. Be sure to perform this test only when transmission fluid is at normal operating temperature and its level is between FULL and LOW marks.
CAUTION:
Do not run engine at stall more than 5 seconds continuously, for fluid temperature may rise excessively high.
After performing stall test, be sure to leave engine running at idle for longer than 1 minute before another stall test.
1) Apply parking brake and block wheels.
2) Install tachometer.
3) Start engine with select lever shifted to “P” range.
4) Depress brake pedal fully.
5) Shift select lever to “D” range and depress accelerator pedal fully while watching tachometer. Read engine rpm quickly when it has become constant (stall speed).
6) Release accelerator pedal immediately after stall speed is checked.
7) In the same way, check stall speed in “R” range.
8) Stall speed should be within the following specification.
Engine stall speed
Standard: 2,250 – 2,550 rpm
Troubleshooting
Condition Possible Cause Action
Lower than standard level in both “D” and “R” range
Engine output torque failure
Inspect and repair engine.
Faulty one-way clutch of torque converter
Replace torque converter.
Higher than standard level in “D” range
Malfunction of pressure control solenoid valve (Low line pressure)
Inspect. If NG, replace valve body assembly.
Faulty valve body component
Replace valve body assembly.
Slippery forward clutch
Inspect. If NG, replace.
Faulty one-way No.2 clutch
Inspect. If NG, replace.
Leakage from “D” range fluid pressure circuit
Overhaul or replace valve body assembly.
Higher than standard level in “R” range
Malfunction of pressure control solenoid valve (Low line pressure)
Inspect. If NG, replace valve body assembly.
Faulty valve body component
Replace valve body assembly.
Slippery reverse clutch
Inspect. If NG, replace.
Slippery 1st and reverse brake
Inspect. If NG, replace.
Leakage from “R” range fluid pressure circuit
Overhaul or replace valve body assembly.
Higher than standard level in both “D” and “R” range
Malfunction of pressure control solenoid valve (Low line pressure)
Inspect. If NG, replace valve body assembly.
Faulty valve body component
Replace valve body assembly.
Clogged oil strainer
Replace.
Faulty oil pump
Inspect. If NG, replace.
Leakage from both “D” and “R” range fluid pressure circuit
Overhaul or replace valve body assembly.