7B1-16 AUTOMATIC TRANSMISSION (4 A/T)
GEAR SHIFT
Trouble Diagnosis Table 3
TRANSMISSION FLUID
RUNNING CONDITION
Condition Possible Cause Correction
Poor 1–2 shift, exces-
sive slippage
Regulator valve sticking Replace.
1–2 shift valve sticking Replace.
Shift solenoid valve-B sticking Replace.
Intermediate coast modulator valve sticking Replace.
Poor 2–3 shift, exces-
sive slippage
2–3 shift valve sticking Replace.
Shift solenoid valve-A sticking Replace.
Poor start or surging
in “D” range
Regulator valve sticking Replace.
Poor 3-4 shift, exces-
sive slippage
3–4 shift valve sticking Replace.
Shift solenoid valve-B sticking Replace.
Excessive shock on
1–2 shift
Regulator valve sticking Replace.
Faulty accumulator, second brake piston Replace.
Excessive shock on
2–3 shift
Regulator valve sticking Replace.
Faulty accumulator, direct clutch piston Replace.
Excessive shock on
3–4 shift
Regulator valve sticking Replace.
Non operate lock-up
system
TCC (Lock-up) control valve sticking Replace.
Solenoid valve No.2 (TCC solenoid valve) stick-
ing
Replace.
Condition Possible Cause Correction
Low fluid pressure Leakage from oil pressure circuit Overhaul.
Condition Possible Cause Correction
Unable to run in all
range
Wear in oil pump Replace.
Seizure in oil pump Replace.
Fluid pressure leakage to over drive clutch due
to wear of oil pump bushing
Replace.
Faulty in torque converter Replace.
Poor 1st speed run-
ning or excessive slip-
page in “D” or “2”
Fluid pressure leakage from forward clutch due
to wear or breakage of O/D case seal ring
Replace.
Overdrive clutch slipping Replace.
Unable to run or
excessive slippage in
“L” range
Fluid pressure leakage of forward clutch due to
wear or breakage of O/D case seal ring
Replace.
Reverse brake disc slipping Replace.
Broken brake piston O-ring Replace.
Unable to run or
excessive slippage in
“R” range
Fluid pressure leakage to direct clutch due to
wear or breakage of center support seal ring
Replace.
Worn direct clutch Replace.
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