TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
AT-37
[RL4R01A]
D
E
F
G
H
I
J
K
L
M
A
B
AT
No engine braking
When overdrive control switch is set
from ON to OFF.
ON VEHICLE
1. Fluid level and fluid quality
2. Control linkage
3. Line pressure
4. Throttle wire
5. Accumulator 2-3
6. Overdrive control switch, overdrive hold
control module (if equipped), overdrive cancel
relay (if equipped), and wiring
7. Overdrive cancel solenoid valve
8. Control valve
* Pressure regulator valve
* Pressure modifier valve
* Throttle valve & detent valve
* Overrun clutch reducing valve
OFF VEHICLE
9. Overrun clutch
When shifting from 2nd to 1st in 1 posi-
tion.
ON VEHICLE
1. Fluid level and fluid quality
2. Control linkage
3. Line pressure
4. Throttle wire
6. Control valve
* Pressure regulator valve
* Pressure modifier valve
* Throttle valve & detent valve
* 1st reducing valve
OFF VEHICLE
7. Overrun clutch
8. Low & reverse clutch
Shift quality
Too low a gear change point from 2nd
to 3rd and from 3rd to 2nd.
ON VEHICLE
1. Fluid level and fluid quality
2. Line pressure
3. Governor pressure
4. Throttle wire
5. Control valve
* 2-3 throttle modifier valve
6. Governor valve
* Primary governor valve
* Secondary governor valve 1
* Secondary governor valve 2
Too high a gear change point from 2nd
to 3rd and from 3rd to 2nd.
ON VEHICLE
1. Fluid level and fluid quality
2. Line pressure
3. Governor pressure
4. Throttle wire
5. Control valve
* 2-3 shift valve
* 2-3 throttle modifier valve
6. Governor valve
* Primary governor valve
* Secondary governor valve 1
* Secondary governor valve 2
Too low a gear change point from 2nd
to 1st in 1 position.
ON VEHICLE
1. Fluid level and fluid quality
2. Line pressure
3. Governor pressure
4. Throttle wire
5. Control valve
* Pressure regulator valve
* Pressure modifier valve
* Throttle valve & detent valve
* 1st reducing valve
6. Governor valve
* Primary governor valve
* Secondary governor valve 1
* Secondary governor valve 2
Symptom
Condition
Diagnostic Item