AUTOMATIC TRANSMISSION (4 A / T) 7B1-29
TIME LAG TEST
This test is to check conditions of clutch, reverse brake and fluid pressure. “Time lag” means time elapsed since
select lever is shifted with engine idling till shock is felt.
1) With chocks placed before and behind front and rear wheels respectively, depress brake pedal.
2) Start engine.
3) With stop watch ready, shift select lever from “N” to “D” range and measure time from that moment till shock
is felt.
4) Similarly measure time lag by shifting select lever from “N” to “R” range.
Specification for time lag:
“N” ! “D” Less than 1.2 sec.
“N” ! “R” Less than 1.5 sec.
NOTE:
D When repeating this test, be sure to wait at least one minute after select lever is shifted back to “N” range.
D Engine should be warmed up fully for this test.
TROUBLESHOOTING
Condition Possible cause Correction
Defective pressure control solenoid
valve (Low line pressure)
Inspect.
If NG, replace valve body assembly.
Defective primary regulator valve
(Low line pressure)
Replace valve body assembly.
“N” ! “D” time la
specification
Defective of oil pump Inspect. If NG, replace.
Leakage from “D” range fluid pressure
circuit
Overhaul or replace valve body
assembly.
Defective forward clutch Replace.
Defective one-way clutch No.2 Replace.
Defective pressure control solenoid
valve (Low line pressure)
Inspect.
If NG, replace valve body assembly.
Primary regulator valve
(Low line pressure)
Replace valve body assembly.
“N” ! “R” time la
specification
Clogged oil strainer Wash strainer.
Leakage from “R” range fluid pressure
circuit
Overhaul or replace valve body
assembly.
Defective direct clutch Replace.
Defective reverse brake Replace.
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