Mitsubishi Montero (2004+). Manual - part 938

 

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Mitsubishi Montero (2004+). Manual - part 938

 

 

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-327

STEP 4. Using scan tool MB991958, check data list.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991958 to the data reading mode for 

following items.

a. Item 31: Low-Reverse Solenoid Valve Duty Percent
b. Item 32: Underdrive Solenoid Valve Duty Percent

c. Item 33: Second Solenoid Valve Duty Percent

d. Item 34: Overdrive Solenoid Valve Duty Percent
e. Item 35: Reduction Solenoid Valve Duty Percent

• Check that the values shown below are displayed 

when each data list item is entered.

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

YES : Go to Step 5.
NO :  Go to Step 7.

STEP 5. Adjust the line pressure.
Adjust the line pressure. Refer to 

P.23A-41

, Line Pressure 

Adjustment. Then check the symptom.
Q: Is the symptom eliminated?

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

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

DRIVING CONDITION

DATA LIST ITEM
31

32

33

34

35

Driving at constant speed of 10 km/h (6.2 mph) in 1st gear

0%

0%

100%

100%

0%

Driving at constant speed of 30 km/h (19 mph) in 2nd gear

100%

0%

0%

100%

0%

Driving at constant speed of 50 km/h (31 mph) in 3rd gear

100%

0%

100%

0%

0%

Driving at constant speed of 50 km/h (31 mph) in 4th gear

0%

0%

100%

0%

100%

Driving at constant speed of 70 km/h (44 mph) in 5th gear

100%

100%

0%

0%

100%

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-328

STEP 6. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and the valve 
body for damage. Repair or replace the faulty parts. Refer to 
GROUP 23B, Valve Body 

P.23B-63

.

Replace the valve body assembly if the damages are thought 
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 8.

STEP 7. Replace each solenoid valve.
Replace the faulty solenoid valve with a new one.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 8.

STEP 8. Replace the PCM.
Q: Is the symptom eliminated?

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

INSPECTION PROCEDURE 11: Early or Late Shifting in Some Gears

.

COMMENT
If some of the shift points are early or late when driv-
ing, the cause is probably a malfunction of the valve 
body, or it is due to the characteristics of the 
INVECS-II system but is not an abnormality.

.

TROUBLESHOOTING HINTS (THE MOST LIKELY 
CAUSES FOR THIS CASE:)

• Malfunction of the valve body

• Malfunction of the PCM

DIAGNOSIS

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

ACX02161AD

VALVE BODY ASSEMBLY

ACX02161AF

LOW-REVERSE
SOLENOID 
VALVE

TORQUE CONVERTER 
CLUTCH SOLENOID VALVE

OVER DRIVE 
SOLENOID VALVE

SECOND 
SOLENOID
VALVE

UNDERDRIVE 
SOLENOID VALVE

REDUCTION
SOLENOID
VALVE <5A/T>

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-329

STEP 1. Using scan tool MB991958, check actuator test 
item 14: INVECS-II Cancel Command.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. 
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991958 to the actuator test mode.

• Item14: INVECS-II Cancel Command.

• Drive the vehicle and confirm the gear shifting corre-

spond to the standard shift line of the shift pattern 
diagram. Refer to 

P.23A-3

.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the gear shifting correspond to the standard shift 

line of the shift pattern diagram?
YES : The symptom is due to characteristics of the 

INVECS-II system, but is not abnormal.

NO :  Go to Step 2.

STEP 2. Check the shift points.
Q: Are the shift points early or late only when transmission 

fluid is -29

°C (84°F) or less (early), or 125°C (257°F) or 

more (late)?
YES : The symptom is due to characteristics of the 

INVECS-II system, but is not abnormal.

NO :  Go to Step 3.

STEP 3. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and the valve 
body for damage. Repair or replace the faulty parts. Refer to 
GROUP 23B, Valve Body 

P.23B-63

.

Replace the valve body assembly if the damages are thought 
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?

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

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

ACX02161AD

VALVE BODY ASSEMBLY

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-330

STEP 4. Replace the PCM.
Q: Is the symptom eliminated?

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

INSPECTION PROCEDURE 12: No Diagnostic Trouble Codes (Does not Shift)

AC205198 AC

Backup Power Supply Circuit

AC204167

CONNECTOR : A-03

AT

A-03 (B)

6

12

5

3 4

2

1

9 10

8

7

11

 

 

 

 

 

 

 

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