Mitsubishi Montero (2002-2004). Manual — part 979

SYMPTOM PROCEDURES <AUTOMATIC TRANSMISSION>

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SYMPTOM PROCEDURES

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STEP 3. Check intermediate connector A-03 and PCM
connector D-133 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 4.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-

2

. Then check for the symptom.

AC204167

CONNECTOR : A-03

AT

A-03 (B)

6

12

5

3 4

2

1

9 10

8

7

11

AC204681AD

CONNECTOR: D-133

D-133 (GR)

31 32

33 34

35 36 37 38 39 40 41 42 43
44 45 46 47 48 49

50 51

52 53

54 55 56

57 58

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SYMPTOM PROCEDURES

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STEP 4. Check the harness for open circuit between PCM
connector D-133 terminal 58 and fusible link.
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO : Repair or replace the harness wire.

STEP 5. Using scan tool MB991502, check data list item 61:
Transmission Range Switch.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to data reading mode for item 61,

Transmission Range Switch.

• Move the selector lever to "P," "R," "N," "D" and sport

mode positions and confirm that the selected transmis-
sion ranges match the positions shown on scan tool
MB991502. (Sport mode is indicated as "D" on scan tool
MB991502.)

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?

YES : Check for the symptom. If the symptom is not

eliminated, replace the PCM.

NO : Refer to

P.23Ac-93

,

P.23Ac-123

, DTCs 27, 28:

Transmission range switch system.

AC204681AD

CONNECTOR: D-133

D-133 (GR)

31 32

33 34

35 36 37 38 39 40 41 42 43
44 45 46 47 48 49

50 51

52 53

54 55 56

57 58

ACX01539AD

MB991502

16-PIN

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SYMPTOM PROCEDURES

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INSPECTION PROCEDURE 13: Poor Acceleration

.

COMMENT
If acceleration is poor when downshifting occurs
while driving, a malfunction of the engine system or a
brake or clutch may exist.

.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

• Malfunction of the engine system

• Malfunction of the clutch system and brake sys-

tem

• Malfunction of the PCM

DIAGNOSIS

STEP 1. Check the engine system.
Refer to GROUP 13A, Diagnosis

− Symptom Chart − Poor

Acceleration

P.13Ad-54

.

Q: Is the inspection result good?

YES : Go to Step 2.
NO : Repair or replace the engine component(s).

STEP 2. Check each brake and clutch.
Perform the torque converter stall test. Refer to

P.23Ab-14

,

Torque Converter Stall Test. Then check for the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 3.

STEP 3. Perform the hydraulic pressure test.
Perform the hydraulic pressure test. Refer to

P.23Ab-15

,

Hydraulic Pressure Test. Then check for the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 4.

STEP 4. Check each brake system and clutch system.
(1) Remove the valve body cover and valve body. Refer to

GROUP 23B, Transmission

P.23B-18

.

(2) Blow 108 kPa (15 psi) compressed air into the each brake

oil orifice and clutch oil orifice of the transmission case, and
check if each brake and clutch piston move and air
pressure is maintained.

Q: Is the air pressure maintained?

YES : The procedure is complete.
NO : Go to Step 5.

ACX02249 AF

OVERDRIVE CLUTCH
OIL ORIFICE

REVERSE
CLUTCH
OIL ORIFICE

SECOND
BRAKE OIL
ORIFICE

LOW-REVERSE
BRAKE OIL ORIFICE

UNDERDRIVE
CLUTCH OIL
ORIFICE

DIRECT
CLUTCH
OIL ORIFICE

REDUCTION
BRAKE OIL
ORIFICE

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SYMPTOM PROCEDURES

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STEP 5. Check each brake system and clutch system.
(1) Remove the transmission.
(2) Check the facing for seizure and piston seal ring for

damage and interference with retainer. Repair or replace
the faulty parts. Refer to GROUP 23B, Transmission

P.23B-

18

, Underdrive Clutch

P.23B-76

, Reverse and Overdrive

Clutches

P.23B-67

, Direct Clutch

P.23B-91

. Then check for

the symptom.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 6.

STEP 6. Replace the PCM.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Start over at Step 1.

INSPECTION PROCEDURE 14: Vibration

.

COMMENT
If vibration occurs when driving at constant speed or
when accelerating in 4th gear, abnormal torque con-
verter clutch pressure or a malfunction of the engine
system, torque converter clutch solenoid, torque con-
verter or valve body may exist.

.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

• Abnormal torque converter clutch pressure

• Malfunction of the engine system

• Malfunction of the torque converter clutch sole-

noid

• Malfunction of the torque converter

• Malfunction of the valve body

• Malfunction of the PCM

AC204883 AH

OVERDRIVE
CLUTCH

REDUCTION
BRAKE

REVERSE
CLUTCH

SECOND
BRAKE

LOW-REVERSE
BRAKE

UNDERDRIVE
CLUTCH

DIRECT
CLUTCH