Mitsubishi Montero (2002-2004). Manual - part 717

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-565

STEP 11. Check for open circuit and short circuit to ground
and harness damage between manifold differential
pressure sensor connector B-28 (terminal No. 1) and PCM
connector D-135 (terminal No. 101).
Q: Is the harness wire in good condition?

YES : Replace the manifold differential pressure sensor.

Then go to Step 12.

NO : Repair it. Then go to Step 12.

STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

GROUP 13A, Procedure 6

− Other Monitor

P.13Ab-2

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P1400 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.

AK200975

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-28

B-28(B)

AK200947

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-135(GR)

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-566

P1601 Communication Malfunction (between PCM and Throttle Actuator Control Module)

TECHNICAL DESCRIPTION

• PCM checks the communication lines for abnor-

mal conditions.

DTC SET CONDITIONS

Check Conditions

• Battery positive voltage is higher than 6.3 volts.

Judgement Criteria

• PCM detects an error in communication with the

throttle actuator control module for 0.05 seconds.

• Throttle actuator control module detects an error

in communication with the PCM for 0.12 seconds.

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

• PCM failed.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC)

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) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P01601 set?

YES : Replace the PCM.
NO : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points

P.00-6

ACX01539

16-PIN

MB991502

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-567

DTC P1603: Battery Backup Line Malfunction

TECHNICAL DESCRIPTION

• The PCM is checks the open circuit of battery

backup line.

NOTE: When the system detects an open circuit in
the battery backup line, it makes 1 failure judgment
of other diagnostic trouble codes (DTCs).

DTC SET CONDITIONS

Check Conditions

• Starting sequence was completed.

• Battery positive voltage is higher than 10 volts.

Judgement Criteria

• Battery backup line voltage has continued to be 6

volts or lower for 2 seconds.

AK201151

WHITE-BLA

FUSIBLE
LINK(5)

BATTERY
BACKUP

POWERTRAIN CONTROL
MODULE (PCM)

Battery Backup Circuit

35363738394041 42 43
444546474849

50 51

5253

545556

57 58

33 34

D-133

(MU803803)

A-03

(MU802611)

1 2 3 4 5 6
7 8 9 10 11 12

AK201038

CONNECTOR: D-133

PCM

D-133(GR)

AK201046

A-03(B)

CONNECTOR: A-03

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-568

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

• Open or shorted battery backup line, or loose

connector.

• PCM failed.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC).

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) Erase the DTC.
(4) Start the engine and run it at idle.
(5) Read the DTC.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P1603 set?

YES : Go to Step 2.
NO : The inspection is complete.

STEP 2. Measure the backup power supply voltage at PCM
connector D-133 by backprobing.
(1) Do not disconnect the PCM connector D-133.

(2) Measure the voltage between terminal No. 58 and ground

by backprobing.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 5.
NO : Go to Step 3.

ACX01539

16-PIN

MB991502

AK200939

CONNECTOR: D-133

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-133(GR)

AK201427

35363738394041 42 43
444546474849

50 51

5253

545556

57 58

33 34

D-133 HARNESS
CONNECTOR:
HARNESS SIDE

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