Mitsubishi Montero Sport (2004+). Manual - part 697

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-353

STEP 4. Replace the torque converter assembly.

(1) Remove the transmission.
(2) Replace the torque converter assembly. Refer to GROUP 

23B, Transmission 

P.23B-19

. Then check the symptom.

Q: Is the symptom eliminated?

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

STEP 5. Replace the PCM.
Q: Is the symptom eliminated?

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

INSPECTION PROCEDURE 6: Shift Shock when Shifting from "N" to "D" and Long Delay

.

COMMENT
If abnormal shock or delay of two seconds or more 
occurs when the selector lever is shifted from "N" to 
"D" range while the engine is idling, the cause is 
probably abnormal underdrive clutch pressure or a 
malfunction of the underdrive clutch, valve body or 
TP sensor.

.

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

• Abnormal underdrive clutch pressure

• Malfunction of the underdrive solenoid valve

• Malfunction of the underdrive clutch

• Malfunction of the valve body

• Malfunction of the TP sensor

• 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

AC103774

TORQUE CONVERTER

AE

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-354

STEP 1. Using scan tool MB991958, check actuator test 
item 02: Underdrive Solenoid Valve.

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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to actuator test mode.

• Item 02: Underdrive Solenoid Valve.

• An audible clicking or buzzing should be heard when 

the underdrive solenoid valve is energized.

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

YES : Go to Step 2.
NO :  Repair or replace the underdrive solenoid valve. 

Refer to GROUP 23B, Valve Body 

P.23B-67

. Then 

confirm that the symptom is eliminated.

STEP 2. Check when shift shock occurs.
Q: When does the shift shock occur?

When engaging from N to D : Go to Step 3.
When the vehicle starts moving : Go to Step 6.

STEP 3. Check the hydraulic pressure (for underdrive 
clutch).

Measure the hydraulic pressure for underdrive clutch when the 
selector lever is shifted from "N" to "D" range. Check if the 
hydraulic pressure is within the standard value. Refer to 

P.23A-26

, Hydraulic Pressure Test.

Q: Is the hydraulic pressure within the standard value?

YES : Go to Step 4.
NO :  Go to Step 8.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-355

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

P.23A-453

, Transmission and Transfer Assembly and refer 

to GROUP 23B, Transmission 

P.23B-19

.

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

clutch oil orifice of the transmission case, and check if the 
underdrive clutch piston moves and air pressure is 
maintained in that condition.

Q: Is the air pressure maintained?

YES : Go to Step 8.
NO :  Go to Step 5.

STEP 5. Check the underdrive clutch.
(1) Remove the transmission assembly.

(2) Check the facing for seizure and the piston seal ring for 

damage and interference with the retainer. Repair or 

replace the faulty parts. Refer to GROUP 23B 

P.23B-63

, 

Underdrive Clutch. Then check the symptom.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 9.

STEP 6. Check shift shock.
Q: Does shift shock occur?

YES : Go to Step 7.
NO :  Go to Step 8.

ACX02249AB

UNDERDRIVE
CLUTCH OIL
ORIFICE

AC103774

UNDERDRIVE CLUTCH

AG

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-356

STEP 7. Using scan tool MB991958, check data list item 11: 
TP Sensor.

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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to data reading mode.

• Item 11: TP Sensor.

• With the throttle valve in the idle position, voltage 

should measure between 535 and 735 mV.

• With the throttle valve in the full-open position, volt-

age should measure between 4,500 and 5,500 mV.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 535 and 735mV at idle, 

and between 4,500 and 5,500 mV in the full-open 
position? 
YES : Go to Step 8.
NO :  Check the TP sensor. Refer to GROUP 13A, 

On-vehicle Service 

P.13A-890

. Then check the 

symptom.

STEP 8. 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-67

.

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 9.

STEP 9. Replace the PCM.
Q: Is the symptom eliminated?

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

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC004272

VALVE BODY ASSEMBLY

AB