7B1-40 AUTOMATIC TRANSAXLE (M13 ENGINE)
Time Lag Test
This test is to check conditions of clutch, brake and fluid pressure. “Time lag” means time elapsed since selector
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.
Gear shifting time lag
“N”
→
“D”: Less than 0.7 sec.
“N”
→
“R”: Less than 1.2 sec.
Troubleshooting
NOTE:
• When repeating this test, be sure to wait at least one minute after select lever is shifted back to “N”
range.
• Engine should be warmed up fully for this test.
• Repeat test 3 times and take average of those data for final time lag data.
Condition Possible Cause Correction
“N”
→
“D” time lag
exceeds specification
Malfunction of transmission fluid temperature
sensor
Inspect. If NG, replace.
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.Faulty forward clutch
Faulty one-way No.2 clutch
Leakage from “D” range fluid pressure circuit Overhaul or replace valve body
assembly.
“N”
→
“R” time lag
exceeds specification
Malfunction of transmission fluid temperature
sensor
Inspect. If NG, replace.
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.Faulty reverse clutch
Faulty 1st and reverse brake
Leakage from “R” range fluid pressure circuit Overhaul or replace valve body
assembly.
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