7B1-28
AUTOMATIC TRANSMISSION (4 A / T)
TROUBLESHOOTING
Condition
Possible cause
Correction
Engine output torque failure
Inspect and repair engine.
Lower than standard level
Defective one-way clutch of torque
converter
Replace.
Defective pressure control solenoid
valve (Low line pressure)
Inspect.
If NG, replace valve body assembly.
Higher than standard level in
Primary regulator valve
(Low line pressure)
Replace valve body assembly.
Higher than standard level in
“D” range
Slippery forward clutch
Replace.
Defective one-way clutch No.2
Replace.
Leakage from “D” range fluid pressure
circuit
Overhaul or replace valve body
assembly.
Defective pressure control solenoid
valve (Low line pressure)
Inspect.
If NG, replace valve body assembly.
Higher than standard level in
Defective primary regulator valve
(Low line pressure)
Replace valve body assembly.
Higher than standard level in
“R” range
Slippery direct clutch
Replace.
Slippery reverse brake
Replace.
Leakage from “R” range fluid pressure
circuit
Overhaul or replace valve body
assembly.
Defective pressure control solenoid
valve (Low line pressure)
Inspect.
If NG, replace valve body assembly.
Defective primary regulator valve
(Low line pressure)
Replace valve body assembly.
High than standard level in
Clogged oil strainer
Wash strainer.
g
both “D” and “R” range
Defective O / D clutch and O / D
one-way clutch
Replace.
Malfunction of oil pump
Replace.
Leakage from fluid pressure circuit
Overhaul or replace valve body
assembly.
