AUTOMATIC TRANSMISSION (4 A/T) 7B1-17
GEAR SHIFT
ABNORMAL NOISE
Scan Tool Data
Refer to Section 6-1.
Inspection of PCM and Its Circuit
Refer to Section 6-1.
Wire Harness and Connectors
Refer to Section 6-1.
Condition Possible Cause Correction
Poor 1–2 shift, exces-
sive slippage
Fluid pressure leakage to overdrive clutch due
to wear or breakage of O/D case seal ring
Replace.
Faulty second brake Replace.
Broken O-ring of second brake piston Replace.
Faulty second coast brake (in “2” range) Replace.
Poor 2–3 shift, exces-
sive slippage
Fluid pressure leakage to overdrive clutch due
to wear or breakage of O/D case seal ring
Replace.
Worn direct clutch bushing Replace.
Direct clutch slipping Replace.
Foreign material caught in direct clutch piston
check ball
Replace.
Poor start or surging
in “D” range
Fluid pressure leakage of forward clutch due to
wear or breakage of O/D case seal ring
Replace.
Malfunction of forward clutch Replace.
Poor 3–4 shift, exces-
sive slippage
Faulty overdrive brake Replace.
Faulty overdrive clutch Replace.
Poor start or juddering
in “R” range
Fluid pressure leakage of direct clutch due to
wear or breakage of oil center support seal ring
Replace.
Worn direct clutch Replace.
Excessive shock on
1– 2 shift
Faulty one-way clutch Replace.
Non operate lock-up
system
Faulty torque converter Replace.
Condition Possible Cause Correction
Abnormal noise in “P”
or “N” range
Worn oil pump Replace.