Page 4129 of 4264

DIAGNOSIS (JR405E) 7A2-137
No. Z2: Mode Lamp (Power Drive or 3rd Start) Does Not Light Up
When The Power Mode or 3rd Start Mode is Turned On
Description:
The mode lamp on the instrument panel does not light up though the power mode or 3rd start mode is turned on
with the ignition switch in ON position.
Possible Cause:
Faulty mode select switch is considered.
Bulb burn out.
No. Z3: Mode Lamp (Power Drive or 3rd Start) Lights Up When
The Power Mode or 3rd Start Mode is Turned Off
Description:
The mode lamp on the instrument panel lights up though the power mode or 3rd start mode is turned off with the
ignition switch in ON position.
Possible Cause:
Faulty mode select switch is considered.
No. Z4: Oil Temperature Warning Lamp Lights up
Description:
Sometimes, the oil temperature warning lamp lights up.
Possible Cause:
When the vehicle is stuck in the mud or continues to accelerate under overload, and ATF temperature exceeds
145 C, the oil temperature warning lamp lights up.
If the oil temperature warning lamp lights up under usual service condition, following causes are considered.
ATF level has increased for some fault.
Refer to "No. Z1: Transmission overheat".
Lights up due to error of the ATF oil thermo sensor.
No. Z5: Select Lever Feeling is Faulty.
Description:
Select lever feeling is faulty.
Possible Cause:
Disordered select cable.
Disordered select lever.
Faulty Manual plate.
Page 4130 of 4264
7A2-138 DIAGNOSIS (JR405E)
No. Z6: Poor Fuel Consumption
Description:
Poor fuel consumption.
Diagnosis Hints:
Basically same causes as "No. C1 - C8: Engine races up (slip) by shift up or shift down" are considered.
No. Z7: Pattern Select Switch is Faulty
Description:
Shift pattern does not change though the pattern select switch is turned on.
Possible Cause:
Faulty mode select switch is considered.
No. Z8: Oil is Splashed During the Running
Description:
Oil is splashed during the running
Possible Cause:
ATF quantity is too high.
No. Z9: Abnormal Smell
Description:
Abnormal smell.
Diagnosis Hints:
Basically a trouble in the AT main unit.
No. Z10: ATF Quantity is Low or High
Description:
Oil quantity is low or high.
Possible Cause:
In case of oil level is high.
ATF temperature is low when ATF quantity is checked.
In case of oil level is low.
ATF leaks is considered. Check the AT main unit and cooler circuit.
Page 4131 of 4264
DIAGNOSIS (JR405E) 7A2-139
No. Z11: Abnormal Oil Pressure
Description:
Oil pressure is low or high.
Possible Cause:
Basically, the same cause as "No. C1 - C8: Engine races up (slip) by shift up or shift down" is considered.
In case of oil pressure is low, faulty oil pump is considered.
No. Z12: Reverse Buzzer Does Not Ring
Description:
Reverse buzzer does not ring in R range.
Possible Cause:
Disordered select cable.
Disordered select lever.
Disordered inhibitor switch.
Page 4132 of 4264

7A2-140 DIAGNOSIS (JR405E)
STALL TEST
CAUTION:
Because A/T may break down, do not perform the stall test continuously.
Procedure
1. Chock the four wheels.
2. Warm up the engine.
3. Apply the parking brake.
4. Step on the foot brake fully.
5. Set the select lever to either D, 3, 2, L or R range.
6. Step on the accelerator pedal fully.
7. When the engine speed becomes constant, record tha
t
value quickly.
Stall Speed
Standard: 2600±150 rpm
Evaluation
1. If the stall speed is higher than standard value in all
ranges.
Low line pressure.
Abraded oil pump.
Faulty operation of low clutch.
Adjustment error of or faulty inhibitor switch.
ATF leaking from oil pump, control valve, or
transmission case.
Fixed pressure regulator valve and pilot valve.
2. If the stall speed is higher than standard value in D, 3, 2
and L ranges.
Slip of low clutch.
Slip of low one-way clutch.
3. If the stall speed is higher than standard value in
R
range.
Slip of low & reverse brake.
Slip of reverse clutch.
4. If the stall speed is lower than standard value in all
ranges.
Slip of one-way clutch (in torque converter).
Faulty engine.
Page 4133 of 4264

DIAGNOSIS (JR405E) 7A2-141
LINE PRESSURE TEST
Procedure
1. Chock the four wheels.
2. Remove the test plug of the transmission case and fit the oil
pressure gauge.
3. Warm up the engine.
4. Apply the parking brake.
5. Step on the foot brake fully.
6.Set the select lever to either D, 3, 2, L or R range.
7. Record the oil pressure at idling.
8. When stepping over the accelerator pedal fully and the
engine speed becomes constant, record the oil pressure
quickly.
Line Pressure
Standard:
Engine Line Pressure (Kpa)
Speed D, 3, 2 or L Range R Range
Idling 350 - 480 450 - 650
Stall 1,050 - 1,250 1.400 - 1,630
Evaluation
1. If the line pressure is lower than standard value at
idling in all ranges.
Abraded oil pump.
Faulty operation of each solenoid.
Sticking of pressure regulator valve or pilot valve.
Fatigued pressure regulator valve or pilot valve spring.
ATF leaking from oil strainer, oil pump, pressure
regulator valve, torque converter relief valve or pressure
relief valve.
2. If the line pressure is lower than standard value at
idling in D, 3, 2 and L ranges.
ATF leaking from low clutch hydraulic circuit.
3. If the line pressure is lower than standard value at
idling in R range.
ATF leaking from reverse hydraulic circuit.
ATF leaking from low and reverse brake hydraulic
circuit.
Page 4134 of 4264
7A2-142 DIAGNOSIS (JR405E)
1. Oil Cooler Out
2. R Range Line Pressure Detection Port
(Low & Reverse Brake Pressure Detection Port)
3. D, 3, 2 & L Range Line Pressure Detection Port
(Low Clutch Pressure Detection Port)
4. Oil Cooler In
4. If the line pressure is lower than standard value at
idling in L and R ranges.
ATF leaking from low and reverse brake hydraulic
circuit.
5. If the line pressure is higher than standard value at
idling in all ranges.
Throttle opening signal reception error.
Faulty oil temperature sensor.
Faulty operation of low clutch solenoid.
Sticking pilot valve.
Sticking pressure regulator valve or plug.
6. If the line pressure is lower than standard value at stall
speed in all ranges.
Throttle opening signal reception error.
Faulty operation of line pressure solenoid.
Faulty operation of low clutch solenoid.
Sticking pilot valve.
Sticking pressure regulator valve or plug.
Page 4135 of 4264

DIAGNOSIS (JR405E) 7A2-143
TIME LAG TEST
Procedure
1. Chock the four wheels.
2. Warm up the engine.
3. Apply the parking brake.
4. Step on the foot brake fully.
5. Set the select lever from N to D or N to R range.
6. Record the time from when moving the select button until
feeling shock.
Time Lag
Standard:
N to D Range: Below 0.7 Seconds
N to R Range: Below 1.2 Seconds
Evaluation
1. If the time lag is out of standard value when shifting N
to D range.
Forward range line pressure is low.
Slip of low clutch.
Slip of low one-way clutch.
Trouble in control valve body (faulty operation, sticking,
clogged oil passage).
Faulty low clutch duty solenoid operation.
Shortage or faulty quality of ATF.
2. If the time lag is out of standard value when shifting N
to R range.
Reverse range line pressure is low.
Slip of low & reverse brake.
Slip of reverse clutch.
Trouble in control valve body (faulty operation, sticking,
clogged oil passage).
Faulty low & reverse brake duty solenoid operation.
Shortage or faulty quality of ATF.
Page 4136 of 4264

7A2-144 DIAGNOSIS (JR405E)
TEST DRIVE
NOTE:
Perform the test at normal operation ATF temperature 50 -
80
C.
Drive the vehicle on level ground so as not to change to
up and down hill control.
1. D range test in Normal and Power shift pattern.
1) Shift into the D range and hold the accelerator pedal
constant at the 50% and 100% throttle angle.
2) 1-2, 2-3, 3-4 and lock-up, up-shift should take place, and
shift points should confirm to those shown in the
diagram.
3) Also check to see that downshift is made from 4-3, 3-2
and 2-1 down-shift point is within the limits shown in the
diagram.
2. 3 range test in Normal and Power shift pattern.
1) Shift into the 3 range and hold the accelerator pedal
constant at the 50% and 100% throttle angle.
2) 1-2, 2-3 and lock-up, up-shift should take place, and
shift points should confirm to those shown in the
diagram.
3) While running in the 3 rages, does not up-shift 3-4.
4) Also check to see that down-shift is made from 4-3, 3-2
and 2-1 down-shift point is within the limits shown in the
diagram.
3. 2 range test in Normal shift pattern.
1) Shift into the 2 range and hold the accelerator pedal
constant at the 50% and 100% throttle angle.
2) 1-2 and up-shift should take place, and shift points
should confirm to those shown in the diagram.
3) While running in the 2 rages, does not up-shift 2-3 or 3-
4, and lock-up does not operate.
4) Also check to see that down-shift is made from 4-3, 3-2
and 2-1 down-shift point is within the limits shown in the
diagram.
4. L range test in Normal shift pattern.
1) While running in the L rages, does not up-shift 1-2, 2-3
or 3-4, and lock-up does not operate.
2) Also check to see that down-shift is made from 4-3, 3-2
and 2-1 down-shift point is within the limits shown in the
diagram.