Mitsubishi Grandis. Manual — part 856
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-91
STEP 4. Hydraulic pressure test
Measure the hydraulic pressure of the underdrive
clutch when the selector lever is at the L range.
OK: Refer to
.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 5.
STEP 5. Engine-A/T-ECU replacement
(1) Replace the engine-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, cleaning, check
and assembly
(1) Check the bolts for looseness and the O-ring,
solenoid valves, springs 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.
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
malfunction of the reverse clutch, low-reverse brake,
or valve body.
POSSIBLE 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 engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-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 (Refer to
).
OK: Refer to
.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 3.
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-92
STEP 3. Engine-A/T-ECU replacement
(1) Replace the engine-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 valves, springs 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.
POSSIBLE 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
DIAGNOSIS
STEP 1. Hydraulic pressure test
Measure the hydraulic pressure of each element
when the selector lever is in 1st, 2nd gear or reverse.
OK: Refer to
.
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 valves, springs 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.
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-93
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
system, damper clutch solenoid valve, valve body or
torque converter (damper clutch).
POSSIBLE CAUSES
• Malfunction of engine system
• Malfunction of damper clutch solenoid valve
• Malfunction of valve body
• Malfunction of torque converter (damper clutch)
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-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 valves, spring 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.
STEP 4. Engine system check
Q: Is the check result normal?
YES :
Replace the engine-A/T-ECU.
NO :
Repair the engine system.
INSPECTION PROCEDURE 7: Shift shock when shifting from N to D and long delay
COMMENTS ON TROUBLE SYMPTOM
If abnormal shock or delay of two seconds or more
occurs when the selector lever is shifted from N to D
range while the engine is idling, the cause is
probably abnormal underdrive clutch pressure or a
malfunction of the underdrive clutch, valve body or
throttle position sensor.
POSSIBLE CAUSES
• Malfunction of underdrive solenoid valve
• Malfunction of input shaft speed sensor
• Abnormal underdrive clutch pressure
• Malfunction of throttle position sensor
• Malfunction of the underdrive clutch
• Malfunction of valve body
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-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. MUT-III data list
Item 0001: Input shaft speed sensor (Refer to data
list reference table
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Refer to diagnosis code 22: Input shaft
speed sensor system
.
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-94
STEP 3. MUT-III data list
Item 32: Underdrive solenoid valve duty ratio.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the engine-A/T-ECU.
STEP 4. Check when shift shock occurs.
Q: Does the shift shock occur when the vehicle starts
moving?
YES :
Go to Step 6.
NO :
Go to Step 5.
STEP 5. Hydraulic pressure test
Measure the hydraulic pressure for underdrive clutch
when the selector lever is shifted from N to D range
(Refer to
).
OK: Refer to
.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 8.
STEP 6. Check when shift shock occurs.
Q: Does the shift shock always occur?
YES :
Go to Step 8.
NO :
Go to Step 7.
STEP 7. MUT-III data list
Item 11: Throttle position sensor (Refer to data list
reference table
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Check the throttle position sensor system
(Refer to GROUP 13, Troubleshooting
STEP 8. Valve body disassembly clean and
assembly
(1) Check the bolts for looseness and the O-ring,
solenoid valves, springs 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 9.
NO :
The inspection is complete.
STEP 9. Underdrive clutch 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 underdrive clutch.
INSPECTION PROCEDURE 8: Shift shock when shifting from N to R and long delay
COMMENTS ON TROUBLE SYMPTOM
If abnormal shock or delay of two seconds or more
occurs when the selector lever is shifted from N to R
range while the engine is idling, the cause is
probably abnormal pressure in reverse clutch and
low-reverse clutch or a malfunction of the reverse
clutch, low-reverse brake, valve body or throttle
position sensor.
POSSIBLE CAUSES
• Malfunction of low-reverse solenoid valve
• Malfunction of input shaft speed sensor
• Malfunction of the inhibitor switch
• Abnormal reverse clutch pressure
• Abnormal low-reverse brake pressure
• Malfunction of throttle position sensor
• Malfunction of the reverse clutch
• Malfunction of low-reverse brake
• Malfunction of valve body
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-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. MUT-III data list
Item 0001: Input shaft speed sensor (Refer to data
list reference table
Q: Is the check result normal?
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