Mitsubishi Montero (2004+). Manual — part 187

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-235

STEP 12. Check for harness damage between right bank
heated oxygen sensor (rear) connector C-14 (terminal No.
2) and PCM connector D-135 (terminal No. 96).

NOTE: Check harness after checking intermediate connector
E-112. If intermediate connector E-112 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion

P.00E-2

. Then go to Step 15.

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO : Repair it. Then go to Step 15.

AK201276

1

2

3

4

CONNECTOR: C-14

C-14(GR)

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

AK200947

91

92

93

94

95

96

97

98

99

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

AB

PCM

D-135(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-236

STEP 13. Check for short circuit to ground and harness
damage between right bank heated oxygen sensor (rear)
connector C-14 (terminal No. 4) and PCM connector D-135
(terminal No. 117).

NOTE: Check harness after checking intermediate connector
E-112. If intermediate connector E-112 is damaged, repair or
replace them. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. Then go to Step 15.

Q: Is the harness wire in good condition?

YES : Go to Step 14.
NO : Repair it. Then go to Step 15.

AK201276

1

2

3

4

CONNECTOR: C-14

C-14(GR)

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

AK200947

91

92

93

94

95

96

97

98

99

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

AB

PCM

D-135(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-237

STEP 14. Check the right bank heated oxygen sensor
(rear).

(1) Disconnect the right bank heated oxygen sensor (rear)

connector C-14 and connect test harness special tool
MB991316 to the connector on the right bank heated
oxygen sensor (rear) side.

(2) Warm up the engine until engine coolant temperature

reaches 80

°C (176°F) or higher.

(3) Perform a racing for 5 minutes or more with the engine

speed of 4,500 r/min.

(4) Connect a digital voltage meter between terminal No. 2

(black clip of special tool) and terminal No. 4 (white clip of
special tool).

(5) While repeatedly revving the engine, measure the right

bank heated oxygen sensor (rear) output voltage.

Standard value: 0.6

− 1.0 volt

CAUTION

• Be very careful when connecting the jumper wire;

incorrect connection can damage the right bank heated
oxygen sensor (rear).

• Be careful the heater is broken when voltage of beyond

8 volts is applied to the right bank heated oxygen sen-
sor (rear) heater.
NOTE: If the sufficiently high temperature [of approximate
400

°

C(752

°

F) or more] is not reached although the right

bank heated oxygen sensor (rear) is normal, the output volt-
age would be possibly low although the rich air/fuel ratio.
Therefore, if the output voltage is low, use a jumper wire to
connect the terminal No. 1 (red clip of special tool) and the
terminal No. 3 (blue clip of special tool) of the right bank
heated oxygen sensor (rear) with the positive terminal and
the negative terminal of 8 volts power supply respectively,
then check again.

Q: Is the voltage between 0.6 and 1.0 volt?

YES : Replace the PCM. Then go to Step 15.
NO : Replace the right bank heated oxygen sensor (rear).

Then go to Step 15.

STEP 15. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Procedure 6 −

Other Monitor

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0136 set?

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

AK201276

1

2

3

4

CONNECTOR: C-14

C-14(GR)

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

AKX01624

HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR

MB991316

WHITE

BLACK

AN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-238

DTC P0137: Heated Oxygen Sensor Circuit Low Voltage (bank 1, sensor 2)

WHITE

BL

ACK

BL

ACK

WHITE

BL

ACK

BL

ACK

BL

ACK

2

1

4 5 6

3

AK201133

TO PCM

FROM MFI RELAY

96

117

2

4

3

1

1

12

23 24 25 26

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

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

E-112

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

POWERTRAIN CONTROL
MODULE (PCM)

9

9

5

4

7

4

3

1 2

C-14

MU802665

Right Bank Heated Oxygen Sensor (rear) Circuit

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)