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

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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

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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

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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

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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