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
<5A/T>.
YES <diagnosis code P1771 (P0705) is set> :
Refer
to diagnosis code P1771 (P0705): Inhibitor
switch system
<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
).
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
<5A/T>.
YES <diagnosis code P1771 (P0705) is set> :
Refer
to diagnosis code P1771 (P0705): Inhibitor
switch system
<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
.
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.
.
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.
.
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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