Mitsubishi Montero (2004+). Manual - part 925

 

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Mitsubishi Montero (2004+). Manual - part 925

 

 

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-275

DTC SET CONDITIONS

Check Conditions

• Throttle position sensor voltage: 1.5 volts or 

more.

• Output speed: 1,000 r/min or more.

• Solenoid status: OFF.

• Transmission range switch position: D.

• Time after lock up clutch release: 5 seconds or 

more.

Judgement Criteria

• Calculated slip (engine speed - input speed): 5 

r/min or less. (10 seconds)

• Calculated slip (engine speed - input speed): -5 

r/min or more. (10 seconds)

.

OBD-II DRIVE CYCLE PATTERN
Start the engine, and drive at 30 km/h (19 mph) for 
30 seconds. Then stop the vehicle, and turn OFF the 
ignition switch. After that, restart the engine, and 
drive again at 30 km/h (19 mph) for 30 seconds.

.

TROUBLESHOOTING HINTS (THE MOST LIKELY 
CAUSES FOR THIS CODE TO BE SET ARE:)

• Malfunction of the torque converter clutch sole-

noid valve

• Malfunction of the valve body

• Damaged harness, connector

• 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

STEP 1. Using scan tool MB991958, read the A/T 
diagnostic trouble code.

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) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 36 set?

YES : Refer to 

P.23A-239

, DTC 36: Torque Converter 

Clutch Solenoid Valve System.

NO :  Go to Step 2.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-276

STEP 2. Using scan tool MB991958, check data list item 52: 
Amount of Torque Converter Clutch Slippage.

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. (Warming up engine)
(3) Set scan tool MB991958 to the data reading mode.

• Item 52: Torque Converter Clutch Amount of Slippage.

• Driving at a constant speed of 80 km/h (50 mph), the 

display should be "

−10 to 10 r/min."

• If the accelerator pedal is released, the display on 

the scan tool changes (50 km/h (31 mph) and less).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the torque converter clutch slippage within the 

specified range?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-6

.

NO :  Go to Step 3.

STEP 3. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 53 set?

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

STEP 4. Replace the valve body.
(1) Replace the valve body. Refer to GROUP 23B, 

Transmission 

P.23B-14

.

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 53 set?

YES : Replace the Torque Converter. Refer to 

P.23A-563

, 

Transmission and Transfer Assembly .

NO :  The procedure is complete.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

ACX02161AD

VALVE BODY ASSEMBLY

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-277

DTC 54 (P1751): A/T Control Relay System

AC205196AB

AC204167

CONNECTOR : A-03

AT

A-03 (B)

6

12

5

3 4

2

1

9 10

8

7

11

AC204750

CONNECTOR : D-13

AB

PCM

1
3 4

2

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-278

.

CIRCUIT OPERATION

• A/T control relay (terminal 1) receives battery 

positive voltage through a battery.

• The PCM (terminal 127) applies voltage to ener-

gize the A/T control relay (terminal 4). With the 
A/T control relay energized, system voltage is 
applied to the PCM (terminals 123 and 124).

.

DESCRIPTIONS OF MONITOR METHODS
If relay output voltage is below specified value, PCM 
judges that A/T control relay has a failure.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (OTHER 
MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• DTC 41 (P0731): 1st gear incorrect ratio

• DTC 42 (P0732): 2nd gear incorrect ratio

• DTC 43 (P0733): 3rd gear incorrect ratio

• DTC 44 (P0734): 4th gear incorrect ratio

• DTC 45 (P0735): 5th gear incorrect ratio

• DTC 46 (P0736): Reverse gear incorrect ratio

• DTC 36 (P0743): Torque converter clutch sole-

noid malfunction

• DTC 31 (P0753): Low-reverse solenoid malfunc-

tion

• DTC 32 (P0758): Underdrive solenoid malfunc-

tion

• DTC 33 (P0763): Second solenoid malfunction

• DTC 34 (P0768): Overdrive solenoid malfunction

• DTC 35 (P0773): Reduction solenoid malfunction

Sensor (The sensor below is determined to be 

normal)

• Torque converter clutch solenoid

• Low-reverse solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

• Reduction solenoid

.

AC204171

CONNECTOR : D-14

AM

4

9

8

6

5

7

1 2

3

10

AC204681AD

CONNECTOR: D-136

D-136 (GR)

121 122

123

124

125 126 127 128 129 130

131 132

133

134 135

136 137 138

139 140

141

142 143

144

145

146

 

 

 

 

 

 

 

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