Mitsubishi Montero (2002-2004). Manual - part 927

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-191

STEP 12. Check the harness for an open or short circuit to 
ground between A/T control solenoid valve assembly 
connector C-03 (terminals 3, 4 and 5) and PCM connector 
D-136 (terminals 136, 137 and 138).
Q: Are the harness wires in good condition?

YES : Go to Step 13.
NO :  Repair or replace the harness wire(s).

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

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

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-192

STEP 13. Check the harness for an open or short circuit to 
ground between A/T control solenoid valve assembly 
connector C-03 (terminals 3, 4, 5 and 9) and solenoid valve 
connectors C-03-1, C-03-2 and C-03-3.
Q: Is the harness wire in good condition?

YES : Replace the PCM.
NO :  Replace the harness wire.

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

AC204749

1
2

CONNECTORS : C-03-1, C-03-2, C-03-3

C-03-1

C-03-1

1
2

C-03-2

1
2

C-03-3

C-03-2

C-03-3

AB

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-193

DTC 35: Reduction Solenoid Valve System

.

Solenoid Valve System Circuit
Refer to 

P.23Ac-147

.

.

CIRCUIT OPERATION
Refer to 

P.23Ac-147

.

.

DTC SET CONDITIONS
If the resistance value for the reduction solenoid 
valve circuit is greater than 3.5 ohms (open) or less 
than 2.6 ohms (short) for 4 seconds, DTC 32 is set. 
The transmission is locked into 3rd gear as a fail-
safe measure, and the "N" range light flashes once 
per second.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Malfunction of reduction solenoid valve

• Damaged harness, connector

• Malfunction of the PCM

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check actuator test 
item 05: Reduction Solenoid Valve.

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to actuator test mode for item 05, 

Reduction Solenoid Valve.

• An audible clicking or buzzing should be heard when the 

reduction solenoid valve is energized.

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

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 Malfunctions 

P.00-6

.

NO :  Go to Step 2.

ACX01539AD

MB991502

16-PIN

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-194

STEP 2. Using scan tool MB991502, read the A/T 
diagnostic trouble code.
(1) Connect scan tool MB991502 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 54 set? (DTC 54 may be set along with multiple 

DTCs.)
YES : Refer to 

P.23Ac-237

 DTC 54: A/T Control Relay 

System.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991502, read the A/T 
diagnostic trouble code.
(1) Connect scan tool MB991502 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: Are DTC 31 and DTC 36 set? (Multiple DTCs may be set.)

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

STEP 4. Measure the reduction solenoid valve resistance 
at A/T control solenoid valve assembly connector C-03.
(1) Disconnect connector C-03 and measure at the solenoid 

valve side.

(2) Measure the resistance between solenoid valve assembly 

connector C-03 terminals 8 and 10.

Resistance value: 2.7 

− 3.4 ohms [at 20°C (68°F)]

Q: Is the measured resistance 2.7 

− 3.4 ohms [at 20°C 

(68

°F)]?

YES : Go to Step 6.
NO :  Go to Step 5.

ACX01539AD

MB991502

16-PIN

ACX01539AD

MB991502

16-PIN

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

AC204918

C-03 HARNESS CONNECTOR : 
SOLENOID VALVE SIDE

CY

6

10

4

9

5

3

8

2

7

1