Time Lag Test - Suzuki Grand Vitara XL-7 Service Manual

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
"N" ! "D" time lag exceeds
g
specification
"N" ! "R" time lag exceeds
g
specification
Possible cause
Defective pressure control solenoid
valve (Low line pressure)
Defective primary regulator valve
(Low line pressure)
Clogged oil strainer
Defective of oil pump
Leakage from "D" range fluid pressure
circuit
Defective forward clutch
Defective one-way clutch No.2
Defective pressure control solenoid
valve (Low line pressure)
Primary regulator valve
(Low line pressure)
Defective of oil pump
Clogged oil strainer
Leakage from "R" range fluid pressure
circuit
Defective direct clutch
Defective reverse brake
AUTOMATIC TRANSMISSION (4 A / T) 7B1-29
Correction
Inspect.
If NG, replace valve body assembly.
Replace valve body assembly.
Wash strainer.
Inspect. If NG, replace.
Overhaul or replace valve body
assembly.
Replace.
Replace.
Inspect.
If NG, replace valve body assembly.
Replace valve body assembly.
Inspect. If NG, replace.
Wash strainer.
Overhaul or replace valve body
assembly.
Replace.
Replace.