Mitsubishi Grandis. Manual — part 857
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-95
YES :
Go to Step 3.
NO :
Refer to diagnosis code 22: Input shaft
speed sensor system
STEP 3. MUT-III diagnosis code
Either of diagnosis codes 27 or 28 is set, inhibtor
switch is defective.
Q: Are diagnosis codes 27 or 28 output?
YES <diagnosis code 27 is set> :
Refer to
diagnosis code 27: Inhibitor switch system
YES <diagnosis code 28 is set> :
Refer to
diagnosis code 28: Inhibitor switch system
NO :
Go to Step 4.
STEP 4. MUT-III data list
Item 31: Low-reverse solenoid valve duty ratio (Refer
to data list reference table
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the engine-A/T-ECU.
STEP 5. Check when shift shock occurs.
Q: Does the shift shock occur when the vehicle starts
moving?
YES :
Go to Step 7.
NO :
Go to Step 6.
STEP 6. Hydraulic pressure test
Measure the hydraulic pressure for reverse clutch
and low-reverse clutch when the selector lever is
shifted from N to R range.
OK: Refer to
.
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Go to Step 9.
STEP 7. Check when shift shock occurs.
Q: Does the shift shock always occur?
YES :
Go to Step 9.
NO :
Go to Step 8.
STEP 8. 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 9.
NO :
Check the throttle position sensor system
(Refer to GROUP 13, Troubleshooting
STEP 9. Valve body disassembly clean and
assembly
(1) Check the bolts for looseness and the O-ring,
solenoid valve, 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 10.
NO :
The inspection is complete.
STEP 10. 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 9: Shift shock when shifting from N to D, 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 D
range and from N to R range while the engine is
idling, the cause is probably abnormal line pressure
or a malfunction of the oil pump, valve body.
POSSIBLE CAUSES
• Abnormal line pressure
• Malfunction of throttle position sensor
• Malfunction of oil pump
• Malfunction of valve body
• Malfunction of the engine-A/T-ECU
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-96
DIAGNOSIS
STEP 1. Hydraulic pressure test
Measure the hydraulic pressure of each element
when the selector lever is in L, 2nd or reverse.
OK: Refer to
.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Go to Step 2.
STEP 2. Line pressure adjustment
(1) Adjust the line pressure (Refer to
(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. Check when shift shock occurs.
Q: Does the shift shock occur when the vehicle starts
moving?
YES :
Go to Step 4.
NO :
Replace the oil pump assembly (Oil pump
cannot be repaired).
STEP 4. Check when shift shock occurs.
Q: Does the shift shock always occur?
YES :
Go to Step 7.
NO :
Go to Step 5.
STEP 5. 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 6.
NO :
Check the throttle position sensor system
(Refer to GROUP 13, Troubleshooting
STEP 6. 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 7.
NO :
The inspection is complete.
STEP 7. Valve body disassembly clean and
assembly
Check the bolts for looseness and the O-ring,
solenoid valve s, springs and valve body for damage.
Q: Is the check result normal?
YES :
The inspection is complete.
NO :
Replace the valve body assembly if the
damages are thought to be irreparable.
INSPECTION PROCEDURE 10: Shift shock and slipping
COMMENTS ON TROUBLE SYMPTOM
If shift shock when driving are due to upshifting or
downshifting and the transmission speed become
higher than the engine speed, the cause is probably
abnormal line pressure or a malfunction of a solenoid
valve, oil pump, valve body or of a brake or clutch.
POSSIBLE CAUSES
• Malfunction of each solenoid valve
• Abnormal line pressure
• Malfunction of valve body
• Malfunction of oil pump
• Malfunction of each brake or each clutch
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-III actuator test
• Item 01: Low-reverse solenoid valve
• Item 02: Underdrive solenoid valve
• Item 03: Second solenoid valve
• Item 04: Overdrive solenoid valve
OK: Operating sound can be heard.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the defective solenoid valve.
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-97
STEP 2. MUT-III data list
• Item 63: Shift position (Refer to data list reference
).
• Item 31, 32, 33, 34: Each solenoid valve duty
ratio (Refer to data list reference table
).
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the engine-A/T-ECU.
STEP 3. Hydraulic pressure test
Check all hydraulic pressures within the standard
value.
OK: Refer to
.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 4.
STEP 4. Line pressure adjustment
(1) Adjust the line pressure (Refer to
(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. 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 :
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 :
The inspection is complete.
STEP 6. Each clutch and 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 each clutch and brake.
INSPECTION PROCEDURE 11: Does not shift properly (all points)
COMMENTS ON TROUBLE SYMPTOM
If all shift points are early or late while driving, the
cause is probably a malfunction of the output shaft
speed sensor, throttle position sensor, or
engine-A/T-ECU.
POSSIBLE CAUSES
• Malfunction of output shaft speed sensor
• Malfunction of throttle position sensor
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-III data list
Item 0002: Output shaft speed sensor (Refer to data
list reference table
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to diagnosis code 23: Output shaft
speed sensor system
STEP 2. 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 3.
NO :
Check the throttle position sensor system
(Refer to GROUP 13, Troubleshooting
STEP 3. MUT-III actuator test
(1) Item 14: INVECS-II cancel command
(2) Test drive the vehicle (Refer to Road Test,
Inspection procedure 8
(3) Check that the gear shifting corresponds to the
standard shift line of the shift pattern diagram.
Q: Is the check result normal?
YES :
The inspection is complete.
NO :
Replace the engine-A/T-ECU.
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-98
INSPECTION PROCEDURE 12: Does not shift properly (some point)
COMMENTS ON TROUBLE SYMPTOM
If some of the shift points are early or late when
driving, the cause is probably a malfunction of valve
body, or it is due to the characteristics of the
INVECS-II system but is not an abnormality.
POSSIBLE CAUSES
• Malfunction of valve body
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. Check when the shift points early or late.
Q: Are the shift points early or late only when A/T fluid
is
−20°C or less, or 125°C or more?
YES :
The symptom is due to characteristics of the
INVECS-II system, but is not abnormal.
NO :
Go to Step 2.
STEP 2. MUT-III actuator test
(1) Item 14: INVECS-II cancel command
(2) Test drive the vehicle (Refer to Road Test,
Inspection procedure 8
(3) Check that the gear shifting corresponds to the
standard shift line of the shift pattern diagram.
Q: Is the check result normal?
YES :
The inspection is complete.
NO :
Replace the engine-A/T-ECU.
INSPECTION PROCEDURE 13: Does not shift (no diagnosis code)
COMMENTS ON TROUBLE SYMPTOM
The gear shifting does not occur while driving. If no
diagnosis codes are set, the cause is probably a
malfunction of the shift switch assembly or
engine-A/T-ECU .
POSSIBLE CAUSES
• Malfunction of Shift switch assembly
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-III data list
Item 54: A/T control relay (Refer to Data List
Reference Table
).
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the engine-A/T-ECU.
STEP 2. MUT-III data list
Item 67: Select switch (Refer to Data List Reference
Table
).
Q: Is the check result normal?
YES :
Replace the engine-A/T-ECU.
NO :
INSPECTION PROCEDURE 16: Shift
switch assembly system check (Refer to
INSPECTION PROCEDURE 14: Poor acceleration
COMMENTS ON TROUBLE SYMPTOM
If acceleration is poor when downshifting occurs
while driving, the cause is probably a malfunction of
the engine system.
POSSIBLE CAUSES
• Malfunction of engine system
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. Engine system check
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the engine system.
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