Mitsubishi Montero Sport (2004+). Manual - part 689

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-321

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 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

Sensor (The sensor below is determined to be 

normal)

• Torque converter clutch solenoid

• Low-reverse solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

.

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-322

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Voltage of battery: 9 volts or more.

• Time after PCM turns on A/T control relay: 0.5 

second or more.

Judgement Criteria

• A/T control relay output voltage: 7 volts or less. 

(0.1 second)

• If DTC 54 (P1751) is set consecutively four times, 

the transmission is locked into 3rd gear as a 
fail-safe measure, and the "N" range light flashes 
once per second.

.

AC205241

START

END

No

Malfunction

Yes

Good

No

Yes

No

Yes

No

Yes

No

Yes

Timer start

TCM turn on A/T 
control relay

Timer > 0.5 sec.

Voltage of battery > 9 V

Output voltage from 
control relay < 7 V

Continuous failure 
for 0.1 sec.

PCM

AB

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-323

OBD-II DRIVE CYCLE PATTERN
Start the engine, and keep the vehicle stopped in P 
range for 5 seconds.

.

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

• Malfunction of the A/T control relay

• 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, check data list item 54: 
A/T Control Relay Output Voltage.

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 54: A/T Control Relay Output Voltage.

• The voltage should equal battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage equal battery positive voltage?

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.00-7

.

NO :  Go to Step 2.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-324

STEP 2. Check the A/T control relay.

(1) Remove the A/T control relay (A/T control relay connector 

C-97).

(2) Using jumper wires, connect terminal 2 to the negative 

battery terminal, and terminal 4 to the positive battery 
terminal.

(3) Measure the resistance between terminal 1 and 3 of the A/T 

control relay.

• The resistance should measure less than 2 ohms.

• Disconnect the jumper wires. The resistance between 

terminals 1 and 3 should measure over limits (open cir-
cuit).

Q: Is the measured resistance less than 2 ohms when the 

relay is energized, and open circuit when the relay is 
de-energized?
YES : Go to Step 3.
NO :  Replace the A/T control relay.

STEP 3. Check A/T control relay connector C-97 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Are the connector and terminals in good condition?

YES : Go to Step 4.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC202440

1
3 4

2

CONNECTOR: C-97

AB

C-97

AC100555

1 2
3 4

C-97 HARNESS CONNECTOR:
A/T CONTROL RELAY SIDE
 

AE

AC202440

1
3 4

2

CONNECTOR: C-97

AB

C-97