Mitsubishi Montero (2002-2004). Manual - part 607

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-125

STEP 4. Check for short circuit to ground between right
bank heated oxygen sensor (front) connector B-07
(terminal No. 4) and PCM connector D-135 (terminal No.
109).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 5.
NO : Repair it. Then go to Step 5.

STEP 5. Perform the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

GROUP 13A, Trouble Code Diagnosis

− OBD-II Drive Cycle

− Procedure 6 − Other Monitor

P.13Ab-2

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0131 set?

YES : Repeat the troubleshooting.
NO : The procedure is complete.

AK201274

CONNECTOR: B-07

B-07(B)

HARNESS
CONNECTOR:
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

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)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-126

DTC P0132: Heated Oxygen Sensor Circuit High Voltage (bank 1, sensor 1)

ACK

TO PCM

FROM MFI RELAY

WHITE

AK201131

109

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

POWERTRAIN CONTROL
MODULE (PCM)

1 2

B-07

MU802605

23 24 25 26

20 21 22

27 28 29 30 31 32 33

10 11

D-116

1
5

7 8

3 4
9 10

2
6

D-14

MU801335

Right Bank Heated Oxygen Sensor (front) Circuit

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)

AK201273

CONNECTOR: B-07

B-07(B)

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

AK201038AF

CONNECTOR: D-135

PCM

D-135(GR)

AK201049

D-14

CONNECTOR: D-14

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-127

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the PCM (ter-
minal No. 109) from the output terminal (terminal
No. 4) of the right bank heated oxygen sensor
(front).

• Terminal No. 2 of the right bank heated oxygen

sensor (front) is grounded with PCM (terminal
No. 96).

TECHNICAL DESCRIPTION

• The right bank heated oxygen sensor (front)

detects the concentration of oxygen in the
exhaust gas; it converts those data to voltage,
and inputs the resulting signals to the PCM.

• When the right bank heated oxygen sensor

(front) begins to deteriorate, the heated oxygen
sensor signal response becomes poor.

• The PCM forcibly varies the air/fuel mixture to

make it leaner and richer, and checks the
response speed of the right bank heated oxygen
sensor (front). In addition, the PCM also checks
for an open circuit in the right bank heated oxy-
gen sensor (front) output line.

DTC SET CONDITIONS

Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

Judgment Criteria

• Right bank heated oxygen sensor (front) output

voltage has continued to be 1.2 volts or higher for
2 seconds.

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

• Short circuit in right bank heated oxygen sensor

(front) output line.

• PCM failed.

AK201049

CONNECTOR: D-116

D-116

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-128

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Check connector B-07 at right bank heated
oxygen sensor (front) and connector D-135 at PCM for
damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 3.

AK201274

CONNECTOR: B-07

B-07(B)

HARNESS
CONNECTOR:
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

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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