Mitsubishi L200. Manual - part 294

 

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Mitsubishi L200. Manual - part 294

 

 

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-83

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
(1) Connect M.U.T.-III to the 16-pin diagnosis 

connector.

(2) Turn the ignition switch to the ON position.
(3) Diagnose the CAN bus line.

Q: Is the check result normal?

YES : 

Check and repair the A/T system.

NO : 

Repair the CAN bus lines (Refer to GROUP 
54C, CAN bus line Diagnostic flow ).

Inspection Procedure 2: Engine Does not Start

COMMENTS ON TROUBLE SYMPTOM
If the engine does not start when the selector lever is 
in P or N position, the cause is probably a malfunc-
tion of inhibitor switch system, transmission control 
cable, engine system, torque converter or oil pump.

PROBABLE CAUSES

• Malfunction of inhibitor switch

• Malfunction of transmission control cable

• Malfunction of engine system

• Malfunction of torque converter

• Malfunction of oil pump

• Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Either of diagnosis codes P1770 (P0705) or P1771 
(P0705) is set, inhibitor switch is defective.

Q: Are diagnosis codes P1770 (P0705) or P1771 

(P0705) output?
YES <diagnosis code P1770 (P0705) is set> : 

Refer 

to diagnosis code P1770 (P0705): Inhibitor 
switch system 

P.23A-46

 <4A/T>, 

P.23A-49

 

<5A/T>.

YES <diagnosis code P1771 (P0705) is set> : 

Refer 

to diagnosis code P1771 (P0705): Inhibitor 
switch system 

P.23A-51

 <4A/T>, 

P.23A-52

 

<5A/T>.

NO : 

Go to Step 2.

STEP 2. Transmission control cable check
Check the transmission control cable and inhibitor 
switch for installation condition.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Adjust the positions of the transmission 
control cable and inhibitor switch (Refer to 

P.23A-114

).

STEP 3. Engine system check

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the engine system.

STEP 4. A/T-ECU replacement
(1) Replace the A/T-ECU.
(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

Q: Does a malfunction take place again?

YES : 

Go to Step 5.

NO : 

The inspection is complete.

STEP 5. Torque converter check
Check for damaged drive plate, incorrect installation 
in the input shaft (inserted at an angle) or damaged 
splines.

Q: Is the check result normal?

YES : 

Check the oil pump for incorrect installation, 

damage and etc., and replace the oil pump 
assembly if necessary (The oil pump cannot 
be disassembled).

NO : 

If repair is possible, repair the damaged 
part. If repair is not possible because the 
splines on the drive plate or torque 
converter are damaged, replace it.

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-84

Inspection Procedure 3: Does not Move Forward

COMMENTS ON TROUBLE SYMPTOM
If the vehicle does not move forward when the selec-
tor lever is shifted N to D, 2, L range or sport mode 
(1st, 2nd gear) while the engine is idling, the cause is 
probably abnormal line pressure or a malfunction of 
the underdrive clutch or valve body.

PROBABLE CAUSES

• Malfunction of underdrive solenoid valve

• Malfunction of inhibitor switch

• Abnormal line pressure

• Malfunction of the underdrive clutch

• Malfunction of valve body

• Malfunction of the oil pump

• Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test
Item 02: Underdrive solenoid valve

OK: Operating sound can be heard.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the underdrive solenoid valve.

STEP 2. M.U.T.-III diagnosis code
Either of diagnosis codes P1770 (P0705) or P1771 
(P0705) is set, inhibitor switch is defective.

Q: Are diagnosis codes P1770 (P0705) or P1771 

(P0705) output?
YES <diagnosis code P1770 (P0705) is set> : 

Refer 

to diagnosis code P1770 (P0705): Inhibitor 
switch system 

P.23A-46

 <4A/T>, 

P.23A-49

 

<5A/T>.

YES <diagnosis code P1771 (P0705) is set> : 

Refer 

to diagnosis code P1771 (P0705): Inhibitor 
switch system 

P.23A-51

 <4A/T>, 

P.23A-52

 

<5A/T>.

NO : 

Go to Step 3.

STEP 3. Underdrive solenoid valve check
(1) Turn the ignition switch to the ON position.
(2) Shift the selector lever from N to D range.
(3) Confirm the operating sound of the underdrive 

solenoid valve.

OK: Operating sound can be heard.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the A/T-ECU.

STEP 4. Hydraulic pressure test
Measure the hydraulic pressure of the underdrive 
clutch when the selector lever is at the L range or 
sport mode (1st gear).

OK: Refer to 

P.23A-120

.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 5.

STEP 5. A/T-ECU replacement
(1) Replace the A/T-ECU.
(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

Q: Does a malfunction take place again?

YES : 

Go to Step 6.

NO : 

The inspection is complete.

STEP 6. Valve body disassembly clean and 
assembly
(1) Check the bolts for looseness and the O-ring, 

solenoid valve and valve body for damage.
Replace the valve body assembly if the damages 
are thought to be irreparable.

(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

Q: Does a malfunction take place again?

YES : 

Go to Step 7.

NO : 

The inspection is complete.

STEP 7. Oil pump check
(1) If the damage is in the oil pump assembly, 

replace the oil pump assembly.

(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

The inspection is complete.

STEP 8. Underdrive clutch check
(1) Check the facing for seizure and the piston seal 

ring for damage and interference with the 
retainer.

(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-85

Q: Is the check result normal?

YES : 

The inspection is complete.

NO : 

Repair or replace the underdrive clutch.

Inspection Procedure 4: Does not Move Backward

COMMENTS ON TROUBLE SYMPTOM
If the vehicle does not move backward when the 
selector lever is shifted to R range while the engine is 
idling, the cause is probably abnormal pressure of 
the reverse clutch and low-reverse brake or a mal-
function of the reverse clutch, low-reverse brake, or 
valve body.

PROBABLE CAUSES

• Abnormal reverse clutch pressure

• Abnormal low-reverse brake pressure

• Malfunction of low-reverse solenoid valve

• Malfunction of the reverse clutch

• Malfunction of low-reverse brake

• Malfunction of valve body

• Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test
Item 01: Low-reverse solenoid valve

OK: Operating sound can be heard.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the low-reverse solenoid valve.

STEP 2. Hydraulic pressure test
Measure the hydraulic pressure for reverse clutch 
and low-reverse brake when the selector lever is at 
the R range.

OK: Refer to 

P.23A-120

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 3.

STEP 3. A/T-ECU replacement
(1) Replace the A/T-ECU.
(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

Q: Does a malfunction take place again?

YES : 

Go to Step 4.

NO : 

The inspection is complete.

STEP 4. Valve body disassembly clean and 
assembly
(1) Check the bolts for looseness and the O-ring, 

solenoid valve and valve body for damage.
Replace the valve body assembly if the damages 
are thought to be irreparable.

(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

Q: Does a malfunction take place again?

YES : 

Go to Step 5.

NO : 

The inspection is complete.

STEP 5. Reverse clutch and low-reverse brake 
check
Check the facing for seizure and the piston seal ring 
for damage and interference with the retainer.

Q: Is the check result normal?

YES : 

The inspection is complete.

NO : 

Repair or replace the reverse clutch and 
low-reverse brake.

Inspection Procedure 5: Does not Move (Forward or Backward)

COMMENTS ON TROUBLE SYMPTOM
If the vehicle does not move forward or backward 
when the selector lever is shifted to any position 
while the engine is idling, the cause is probably an 
abnormal line pressure, a malfunction of the power 
train components, oil pump or valve body.

PROBABLE CAUSES

• Abnormal line pressure

• Malfunction of valve body

• Malfunction of torque converter

• Malfunction of oil pump

• Malfunction of each element

• Malfunction of power train components

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-86

DIAGNOSIS PROCEDURE

STEP 1. Hydraulic pressure test
Measure the hydraulic pressure of each element 
when the selector lever is 2, L range, sport mode 
(1st, 2nd gear) or reverse.

OK: Refer to 

P.23A-120

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 2.

STEP 2. Valve body disassembly clean and 
assembly
(1) Check the bolts for looseness and the O-ring, 

solenoid valve and valve body for damage.
Replace the valve body assembly if the damages 
are thought to be irreparable.

(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

Q: Does a malfunction take place again?

YES : 

Go to Step 3.

NO : 

The inspection is complete.

STEP 3. Torque converter check
Check for damaged drive plate, incorrect installation 
in the input shaft (inserted at an angle) or damaged 
splines.

Q: Is the check result normal?

YES : 

Check the oil pump for incorrect installation, 

damage and etc., and replace the oil pump 
assembly if necessary (The oil pump cannot 
be disassembled.) 

NO : 

If repair is possible, repair the damaged 
part. If repair is not possible because the 
splines on the drive plate or torque 
converter are damaged, replace it.

STEP 4. Power train components check
Disassemble the transmission and check the input 
shaft, planetary carrier, output shaft differential and 
each element, etc.

Q: Is the check result normal?

YES : 

The inspection is complete.

NO : 

Repair or replace each power train 
components.

Inspection Procedure 6: Engine Stalls During Shifting

COMMENTS ON TROUBLE SYMPTOM
If the engine stalls when the selector lever is shifted 
from N to D or R range while the engine is idling, the 
cause is probably a malfunction of the engine sys-
tem, damper clutch solenoid valve, valve body or 
torque converter (damper clutch).

PROBABLE CAUSES

• Malfunction of engine system

• Malfunction of damper clutch solenoid valve

• Malfunction of valve body

• Malfunction of torque converter (damper clutch)

• Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test
Item 06: Damper clutch solenoid valve

OK: Operating sound can be heard.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the damper clutch solenoid valve.

STEP 2. Valve body disassembly clean and 
assembly
(1) Check the bolts for looseness and the O-ring, 

solenoid valve and valve body for damage.
Replace the valve body assembly if the damages 
are thought to be irreparable.

(2) Test drive the vehicle.
(3) Verify that the condition described by the 

customer exists.

Q: Does a malfunction take place again?

YES : 

Go to Step 3.

NO : 

The inspection is complete.

STEP 3. Torque converter check
Check for damaged drive plate, incorrect installation 
in the input shaft (inserted at an angle), damaged 
splines or damper clutch sealing.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

If repair is possible, repair the damaged 
part. If repair is not possible because the 
splines on the drive plate or torque 
converter are damaged, replace it.

 

 

 

 

 

 

 

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