Mitsubishi Montero (2002-2004). Manual — part 938

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STEP 4. Check A/T control solenoid valve assembly
connector C-03 and PCM connector D-136 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connectors and terminals in good condition?

YES : Replace the torque converter clutch solenoid valve.

Refer to GROUP 23B, Valve Body

P.23B-80

.

NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-

2

.

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

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STEP 5. Using scan tool MB991502, check data list item 52:
Amount of Torque Converter Clutch Slippage. (Second
check)
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at constant speed of 60 km/h (37

mph). (Gear range: 3rd gear)

(3) Set scan tool MB991502 to data reading mode for item 52,

Amount of Torque Converter Clutch Slippage.

• Driving at constant speed of 60 km/h (31 mph), the dis-

play 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 6.

STEP 6. 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 7.
NO : The procedure is complete.

STEP 7. Replace the valve body.
(1) Replace the valve body. Refer to GROUP 23B,

Transmission

P.23B-18

.

(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.23Aa-37

,

Transmission and Transfer Assembly.

NO : The procedure is complete.

ACX01539AD

MB991502

16-PIN

ACX02161AD

VALVE BODY ASSEMBLY

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DTC 54: 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

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.

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).

.

DTC SET CONDITIONS
If the A/T control relay voltage is less than 7 volts at
the PCM (terminals 123 and 124) when the ignition
switch is in the "ON" position, DTC 54 is set. The
transmission is locked into the 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 the A/T control relay

• Damaged harness, connector

• Malfunction of the PCM

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