Mitsubishi Montero (2004+). Manual — part 910

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

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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.

DTC 34 (P0768): Overdrive Solenoid Valve System

.

SOLENOID VALVE SYSTEM CIRCUIT
Refer to

P.23A-177

.

.

CIRCUIT OPERATION
Refer to

P.23A-177

.

.

DESCRIPTIONS OF MONITOR METHODS
If solenoid terminal voltage is below specified value
when shift control is not in progress, PCM judges
that overdrive solenoid 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

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

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• 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 35 (P0773): Reduction solenoid malfunction

• DTC 54 (P1751): A/T control relay malfunction

Sensor (The sensor below is determined to be

normal)

• Torque converter clutch solenoid

• Low-reverse solenoid

• Underdrive solenoid

• Second solenoid

• Reduction solenoid

• A/T control relay

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

AC205284

Good

Malfunction

END

START

In-gear?

Shift solenoid-D is in ON
or OFF steady state

Voltage of battery > 10 V

Solenoid circuit
voltage < 3 V

Continuous failure
for 0.3 sec.

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Overdrive solenoid valve is in
ON or OFF steady state

AB

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DTC SET CONDITIONS

Check Conditions

• Solenoid status: either solid ON or OFF.

• Shift status: in-gear.

• Voltage of battery: 10 volts or more.

Judgement Criteria

• Solenoid voltage: 3 volts or less. (0.3 second)

• If DTC 34 (P0768) 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.

.

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 overdrive solenoid valve

• 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 actuator test
item 04: Overdrive 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 the actuator test mode.

• Item 04: Overdrive Solenoid Valve.

• An audible clicking or buzzing should be heard when

the overdrive 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.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

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AUTOMATIC TRANSMISSION

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STEP 2. Using scan tool MB991958, read the A/T
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 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.23A-277

DTC 54: A/T Control Relay

System.

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read the A/T
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 A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are DTC 32 and DTC 33 set? (Multiple DTCs may be set).

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

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR