Mitsubishi Pajero Pinin. Manual — part 177
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-18
INSPECTION PROCEDURE 3
Does not move forward only
Probable cause
When the engine is idling, the vehicle does not move forward even if the selector
lever is shifted from N to D, 2 or L range. In such cases, the cause is probably
a malfunction of the clutch or brake.
D
Malfunction of forward clutch
D
Malfunction of direct clutch
D
Malfunction of one-way clutch No. 2
D
Malfunction of brake No. 1, No. 2, No. 3
D
Malfunction of A/T-ECU
L
: Refer to the Transmission Workshop Manual.
Does not vehicle move forward in D,
2 and L range?
No
Check the forward clutch.
L
Yes
Does not vehicle move forward in D
and 2 range?
No
Check one-way clutch No. 2.
L
Yes
Does not vehicle move forward in 2
range?
No
Check the brake No. 3.
L
Yes
Which is the drive gear in D range?
2nd
Check the brake No. 1, No. 2.
L
3rd
Check the direct clutch.
L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
INSPECTION PROCEDURE 4
Does not reverse only
Probable cause
When the engine is idling, the vehicle does not reverse even if the selector lever
is shifted from N to R range. In such cases, the cause is probably a malfunction
of a clutch, brake or the valve body.
D
Malfunction of brake No. 1, No. 3
D
Malfunction of direct clutch
D
Malfunction of valve body
D
Malfunction of planetary gear
D
Malfunction of A/T-ECU
L
: Refer to Transmission Workshop Manual.
Check the drive gear in D range.
2nd
Check the brake No. 1.
L
1st
3rd
Check the planetary gear.
L
Does the A/T shift up to 2nd gear?
No
Malfunction of 1-2 shift valve.
L
Yes
Is there any slippage in 3rd gear in
D range?
NG
Check the direct clutch.
L
OK
Check the brake No. 3.
L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-19
INSPECTION PROCEDURE 5
Upshifting does not occur
Probable cause
Upshifting does not occur under conditions when upshifting should occur. Check
shifting from 1
→
2, 2
→
3 and 3
→
4 respectively.
D
Malfunction of solenoid valve No. 1, No. 2
D
Malfunction of A/T-ECU
D
Malfunction of power train internal parts
L
: Refer to the Transmission Workshop Manual.
Is a normal diagnostic code output?
No
To Inspection Chart For Each Diagnosis
Code (Refer to P. 23-9.)
Yes
Does not the A/T shift from 1
→
2?
No
Does the A/T shift to 2nd gear in 2
range?
No
Malfunction of 1-2 shift valve.
L
Malfunction of solenoid valve No.
2.
L
Yes
Yes
Check the brake No. 2 system.
L
Check one-way clutch No. 1.
L
Does not the A/T shift from 2
→
3?
No
Does the vehicle reverse in R range?
No
Check the direct clutch system.
L
Yes
Yes
Malfunction of 2-3 shift valve.
L
Malfunction of solenoid valve No. 1.
L
A/T does not shift from 3
→
4.
Does the vehicle move in 1st gear in
D range?
No
Malfunction of solenoid valve No.
2.
L
Yes
Inspection Procedure 15 – Overdrive
Switch System (Refer to P. 23-25.)
NG
Repair
OK
Malfunction of 3-4 shift valve.
L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-20
INSPECTION PROCEDURE 6
Downshifting does not occur
Probable cause
Downshifting does not occur under conditions when downshifting should occur. Check
shifting from 2
→
1, 3
→
2 and 4
→
3 respectively.
D
Malfunction of solenoid No. 1, No. 2
D
Malfunction of A/T-ECU
D
Malfunction of power train internal parts
L
: Refer to the Transmission Workshop Manual.
Is a normal diagnosis code output?
No
To Inspection Chart For Diagnosis
Code (Refer to P. 23-9.)
Yes
Does not the A/T shift from 4
→
3?
No
Which gear is engaged when the A/T
is shifted from D range to 2 range
(accelerator OFF) while in 3rd gear?
(DRIVE 1ST)
Malfunction of solenoid valve No.
2
L
Yes
(DRIVE 2ND, 4TH)
Malfunction of 3-4 shift valve
L
Does not the A/T shift from 3
→
2?
No
Does the vehicle move in 1st gear in
D range?
(DRIVE 4TH)
Malfunction of 2–3 shift valve
L
Yes
(DRIVE 1ST)
Malfunction of solenoid valve No. 1
L
A/T does not shift from 2
→
1.
Does the A/T shift from 3
→
4 in D range?
No
Malfunction of solenoid valve No.
2
L
Yes
Does the vehicle move forward in L
range?
No
Malfunction of 1–2 shift valve
L
Yes
Does the vehicle reverse in R range?
No
Check the brake No. 1.
L
Yes
Check the brake No. 2.
L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
INSPECTION PROCEDURE 7
Shifting point abnormality
Probable cause
Shifting occurs at points which are different from the shift pattern. Note that the
shift pattern will vary in different modes and at high A/T fluid temperatures.
D
Malfunction of A/T fluid temperature sensor
D
Malfunction of A/T-ECU
Is a normal diagnosis code output?
No
To Inspection Chart For Diagnosis
Code (Refer to P. 23-9.)
Yes
MUT-
II
SERVICE DATA
D
15 – A/T fluid temperature sensor
OK: 70 – 90
_
C after engine
warmed-up
NG
Code No. 15, 16 – A/T fluid temperature
sensor system (Refer to P. 23-10.)
OK
Replace the A/T-ECU.
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-21
INSPECTION PROCEDURE 8
Upshifting occurs spontaneously
Probable cause
Upshifting occurs in ranges where upshifting should not occur, e. g. upshifting to
2nd gear in L range, 3rd gear in 2 range or 4th gear in D range when overdrive
is disconnected.
D
Malfunction of inhibitor switch
D
Malfunction of overdrive switch
D
Malfunction of A/T-ECU
MUT-
II
SERVICE DATA
D
37 – Inhibitor switch
OK: MUT-
II
display and selector
lever position should match
NG
Inspection Procedure 14 – Inhibitor
switch system (Refer to P. 23-25.)
OK
MUT-
II
SERVICE DATA
D
35 – Overdrive switch
OK: MUT-
II
display and mode
selected should match
NG
Inspection Procedure 15 – Overdrive
switch system (Refer to P. 23-25.)
OK
Replace the A/T-ECU.
INSPECTION PROCEDURE 9
Incorrect drive gear position
Probable cause
Vehicle starts off in 2nd, 3rd or 4th gear when in D range. Often occurs when starting
off is not smooth.
D
Malfunction of inhibitor switch
D
Malfunction of direct clutch
D
Malfunction of planetary gear
D
Malfunction of valve body
D
Malfunction of forward clutch
D
Malfunction of solenoid valve No. 1
D
Malfunction of A/T-ECU
L
: Refer to the Transmission Workshop Manual.
MUT-
II
SERVICE DATA
D
37 – Inhibitor switch
OK: MUT-
II
display and selector
lever position should match
NG
Inspection Procedure 14 – Inhibitor
switch system (Refer to P. 23-25.)
OK
Does the vehicle move forward in 2nd
gear?
Yes
Inspection Procedure 6 – Downshifting
does not occur (Refer to P. 23-20.)
No
Does the vehicle move forward in 3rd
gear? (D range)
Yes
Does the vehicle reverse in R range?
Yes
Check the direct clutch.
L
No
No
Check the planetary gear.
L
Does the vehicle move forward in 3rd
gear? (2, L range)
Yes
Malfunction of 2–3 shift valve
L
Malfunction of solenoid valve No. 1
L
No
Does the vehicle move forward in 4th
gear?
Yes
Does the vehicle reverse in R range?
Yes
Malfunction of solenoid valve No.
1
L
No
No
Check the forward clutch.
L
Malfunction of 2–3 shift valve
L
Check the trouble symptoms.
NG
Replace the A/T-ECU.
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