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Mitsubishi Montero Sport (2004+). Manual - part 665

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

23A-225

AC202437

CONNECTOR:B-02

B-02 (B)

TRANSMISSION
CONTROL CABLE

AC004272AM

CONNECTORS : B-02-1, B-02-2, B-02-3
B-02-4, B-02-5

B-02-1

B-02-2

B-02-3

B-02-4

B-02-5

AC202439

2021

1718

6 7

1415

4 5

1112

1 2 3

9 10

6 7 8

1516

12 13

CONNECTORS: C-41, C-96

C-41

C-96

C-41

C-96

AC202317

PCM

120

107

119

106

129 130

118

105

117

114115116

126127128

104

111

103

112

108

101102

109110

121122123

124

113

125

CONNECTOR: C-92

C-92 (GR)

AC202440

1
3 4

CONNECTOR: C-97

C-97

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

23A-226

CIRCUIT OPERATION

• The A/T control relay supplies battery positive

voltage to the solenoid valve assembly (terminals
9 and 10).

• The solenoid valve closes when energized (on),

and opens when not energized (off). The PCM
energizes the solenoid valve based on input data
from sensors such as the TP Sensor, Transmis-
sion Range Switch, Stoplight Switch, Vehicle
Speed Sensor, Input Shaft Speed Sensor, Output
Shaft Speed Sensor, and Transmission Fluid
Temperature Sensor.

• The PCM provides the ground to energize the

solenoid. The amount of time that the circuit is
grounded is displayed on scan tool MB991958 in
percent.

• When the solenoid is energized or de-energized,

fluid passes through the valve body and transmis-
sion passages to apply and release components.

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

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

• DTC 46 (P0736): Reverse gear incorrect ratio

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

noid malfunction

• DTC 32 (P0758): Underdrive solenoid malfunc-

tion

• DTC 33 (P0763): Second solenoid malfunction

• DTC 34 (P0768): Overdrive solenoid malfunction

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

Sensor (The sensor below is determined to be

normal)

• Torque converter clutch solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

• A/T control relay

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

23A-227

LOGIC FLOW CHARTS (Monitor Sequence)

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 31 (P0753) 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 low-reverse solenoid valve

• Damaged harness, connector

• Malfunction of the PCM

AC205281

Good

Malfunction

END

START

In-gear?

Shift solenoid-A is in ON
or OFF steady state

Voltage of battery > 10 V

Solenoid circuit
voltage < 3 V

Continuous failure
for 0.3 sec.

Yes

Low-reverse solenoid valve
is in ON or OFF steady state

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

23A-228

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 01: Low-Reverse 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 actuator test mode.

• Item 01: Low-Reverse Solenoid Valve.

• An audible clicking or buzzing should be heard when

the low-reverse 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.00-7

NO : Go to Step 2.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

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