Mitsubishi Pajero Pinin 1999 Workshop Manual page 312

23-20
AUTOMATIC TRANSMISSION ±
INSPECTION PROCEDURE 6
Downshifting does not occur
Downshifting does not occur under conditions when downshifting should occur. Check
→ →
shifting from 2 1, 3 2 and 4
L : Refer to the Transmission Workshop Manual.
Is a normal diagnosis code output?
Yes
Does not the A/T shift from 4
Yes
Does not the A/T shift from 3
Yes
→
A/T does not shift from 2 1.
INSPECTION PROCEDURE 7
Shifting point abnormality
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.
Is a normal diagnosis code output?
Yes
MUT- II SERVICE DATA
15 ± A/T fluid temperature sensor
OK: 70 ± 90 _ C after engine
warmed-up
OK
Replace the A/T-ECU.
→
3 respectively.
No
To Inspection Chart For Diagnosis
Code (Refer to P. 23-9.)
No
→
3? Which gear is engaged when the A/T
is shifted from D range to 2 range
(accelerator OFF) while in 3rd gear?
Malfunction of 3-4 shift valve L
No
→
2? Does the vehicle move in 1st gear in
D range?
Malfunction of solenoid valve No. 1 L
Does the A/T shift from 3
Does the vehicle move forward in L
range?
Does the vehicle reverse in R range?
Check the brake No. 2. L
No
To Inspection Chart For Diagnosis
Code (Refer to P. 23-9.)
NG
Code No. 15, 16 ± A/T fluid temperature
sensor system (Refer to P. 23-10.)
Troubleshooting <A/T>
Probable cause
Malfunction of solenoid No. 1, No. 2
Malfunction of A/T-ECU
Malfunction of power train internal parts
(DRIVE 1ST)
(DRIVE 2ND, 4TH)
(DRIVE 4TH)
(DRIVE 1ST)
No
→
4 in D range?
Yes
No
Yes
No
Yes
Probable cause
Malfunction of A/T fluid temperature sensor
Malfunction of A/T-ECU
Malfunction of solenoid valve No.
2 L
Malfunction of 2±3 shift valve L
Malfunction of solenoid valve No.
2 L
Malfunction of 1±2 shift valve L
Check the brake No. 1. L
Check the trouble symptoms.
NG
Replace the A/T-ECU.