AUTOMATIC TRANSMISSION (4 A / T)
7B1-25
ROAD TEST
This test is to check if upshift and downshift take place at specified speed while actually driving vehicle on a level
road.
WARNING:
D
Carry out test in very little traffic area to prevent an accident.
D
Test requires 2 persons, a driver and a tester.
1) Warm up engine.
2) With engine running at idle, shift select lever “D”.
3) Accelerate vehicle speed by depressing accelerator pedal gradually.
4) While driving in “D” range, check if gear shift and lock-up occur properly as shown in “GEAR SHIFT DIAGRAM
AND LOCK-UP DIAGRAM” in this section.
TROUBLESHOOTING
Condition
Possible cause
Correction
Malfunction of shift solenoid-B valve
Inspect shift solenoid-B valve.
If NG, replace.
1
!
2 upshift fails to occur
Defective valve body component
Replace valve body assembly.
Defective 2nd brake
Replace.
Defective one-way clutch No.1
Replace.
2
3 upshift fails to occur
Malfunction of shift solenoid-A valve
Inspect shift solenoid-A valve and its
circuit. If NG, replace.
2
!
3 upshift fails to occur
Defective valve body component
Replace valve body assembly.
Defective direct clutch
Replace.
Malfunction of shift solenoid-B valve
Inspect. If NG, replace.
Defective valve body component
Replace valve body assembly.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
3
!
O / D upshift fails to
occur
Malfunction of acceleration stroke sensor
Inspect referring to Section 6E3. If NG,
replace.
occur
Malfunction of O / D off switch
Refer to “DIAGNOSTIC FLOW TABLE
Malfunction of 4WD low switch
Refer to “DIAGNOSTIC FLOW TABLE
A-1” in this section
Malfunction of transmission range sensor
A-1 in this section.
Defective O / D brake
Replace.
Defective shift solenoid-A or -B valve
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If lNG, replace.
Gear shift point is incorrect
Malfunction of acceleration stroke sensor
Inspect referring to Section 6E3. If NG,
replace.
Defective valve body component
Replace valve body assembly.
Malfunction of TCC (lock-up) solenoid
Inspect. If NG, replace.
Defective valve body component
Replace valve body assembly.
Malfunction of input shaft speed sensor
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
TCC (lock-up) function does
Malfunction of acceleration stroke sensor
Inspect referring to Section 6E3. If NG,
replace.
(
)
not operate
Malfunction of brake light switch
Malfunction of 4WD low switch
Refer to “DIAGNOSTIC FLOW TABLE
Malfunction of transmission fluid
Refer to DIAGNOSTIC FLOW TABLE
A-2” in this section
temperature sensor
A-2 in this section.
Malfunction of transmission range sensor
Defective torque converter
Replace.
