Suzuki Grand Vitara 1998, Service Manual

Page: 432 / 801

YH4
GRAND
VITARA
7B1-30 AUTOMATIC TRANSMISSION (4 A / T)
Running condition
Gear shift
Abnormal noise
Condition Possible Cause Correction
Poor 1st speed run-
ning or excessive
slippage 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 ex-
cessive 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 ex-
cessive 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.
Poor 1–2 shift, ex-
cessive 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, ex-
cessive 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 pis-
ton 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, ex-
i li
Faulty overdrive brake Replace.
cessive slippage
Faulty overdrive clutch Replace.
Poor start or judder-
ing 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.
Abnormal noise in
“P” or “N” range Worn oil pump Replace.
SCAN TOOL DATA
-Refer to SECTION 6 / 6-1.
INSPECTION OF PCM AND ITS CIRCUIT
-Refer to SECTION 6 / 6-1.
WIRE HARNESS AND CONNECTORS
-Refer to SECTION 6 / 6-1.