Mitsubishi Montero (2004+). Manual - part 936

 

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Mitsubishi Montero (2004+). Manual - part 936

 

 

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-319

STEP 5. Check the reverse clutch system and low-reverse 
brake system.
(1) Remove the valve body cover and valve body. Refer to 

P.23A-563

, Transmission and Transfer Assembly and refer 

to GROUP 23B, Transmission 

P.23B-14

.

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

clutch oil orifice of the transmission case, and check if the 
reverse clutch piston moves and air pressures are 
maintained in that condition. Repeat for the low-reverse 
brake.

Q: Are both air pressures maintained?

YES : Go to Step 6.
NO :  Go to Step 9.

STEP 6. Check the reverse clutch and low-reverse brake.
(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, 
Transmission 

P.23B-14

, Reverse and Overdrive Clutch 

P.23B-50

. Then retest the system.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 11.

STEP 7. Check shift shock.
Q: Does shift shock occur sometimes?

YES : Go to Step 8.
NO :  Go to Step 9.

ACX02249AC

REVERSE
CLUTCH OIL
ORIFICE

LOW-REVERSE
BRAKE OIL
ORIFICE

AC204883

REVERSE
CLUTCH

LOW-REVERSE
BRAKE

AC

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-320

STEP 8. 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 the data reading mode.

• Item 11: TP Sensor.

• With the throttle valve in the idle position, voltage 

should measure between 200 and 800 mV.

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

age should measure between 3,800 and 4,900 mV.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 200 and 800 mV at 

idle, and between 3,800 and 4,900 mV in the full-open 
position? 
YES : Go to Step 10.
NO :  Go to Step 9.

STEP 9. Using scan tool MB991958, read the MFI 
diagnostic trouble code.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check for MFI diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are MFI DTC Nos. of TP sensor system set?

YES : Refer to GROUP 13A, Diagnosis 

− Diagnostic 

Trouble Code Chart 

P.13A-26

.

NO :  Go to Step 11.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-321

STEP 10. 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 11.

STEP 11. Replace the PCM.
Q: Is the symptom eliminated?

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

INSPECTION PROCEDURE 8: Shift Shock when Shifting from "N" to "D," "N" to "R" and Long Delay

.

COMMENT
If abnormal shock or delay of two seconds or more 
occurs when the selector lever is moved from "N" to 
"D" range or from "N" to "R" range while the engine is 
idling, the cause is probably abnormal line pressure 
or a malfunction of the transmission oil pump or 
valve body.

.

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

• Abnormal line pressure

• Malfunction of the transmission oil pump

• Malfunction of the valve body

• Malfunction of the PCM

DIAGNOSIS

STEP 1. Check the hydraulic pressure.
(1) Measure the hydraulic pressure of each element when the 

transmission is in 1st, 2nd or reverse. Check if each 
hydraulic pressure is within the standard value. Refer to 

P.23A-26

, Hydraulic Pressure Test.

(2) If some elements pressure are within the standard value 

and some are not, recheck the symptom.

Q: Are all hydraulic pressures within the standard value?

YES : Go to Step 3.
NO :  Go to Step 2.

STEP 2. Adjust line pressure.
Adjust line pressure. Refer to 

P.23A-41

, Line Pressure Adjust-

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

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

ACX02161AD

VALVE BODY ASSEMBLY

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-322

STEP 3. Check when shift shock occurs.
Q: When does the shift shock occur?

When engaging from "N" to "D" and "N" to "R" : Go to 

Step 4.

When the vehicle starts moving : Go to Step 5.

STEP 4. Replace the transmission oil pump.
(1) Remove the transmission.
(2) Replace the transmission oil pump. (Oil pump cannot be 

repaired). Refer to GROUP 23B, Transmission 

P.23B-14

. 

Then check the symptom.

Q: Is the symptom eliminated?

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

STEP 5. Disassemble and clean the valve body.
Check the installation bolts for looseness and the O-ring, 
valves and 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 6.

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

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

INSPECTION PROCEDURE 9: Shift Shock and Slipping

.

COMMENT
If shift shock when driving is due to upshifting or 
downshifting and the transmission speed become 
higher than the engine speed, the cause is probably 
abnormal line pressure or a malfunction of a solenoid 
valve, transmission oil pump, valve body or of a 
brake or clutch.

.

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

• Abnormal line pressure

• Malfunction of each solenoid valve

• Malfunction of the transmission oil pump

• Malfunction of the valve body

• Malfunction of each brake or each clutch

• Malfunction of the PCM

AC204883 AD

ACX02161AD

VALVE BODY ASSEMBLY

 

 

 

 

 

 

 

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