Mitsubishi Montero (2002-2004). Manual - part 620

 

  Index      Mitsubishi     Mitsubishi Montero - service repair manual 2002-2004 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  618  619  620  621   ..

 

 

Mitsubishi Montero (2002-2004). Manual - part 620

 

 

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-177

.

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the PCM (ter-
minal No. 117) from the output terminal (terminal 
No. 4) of the right bank heated oxygen sensor 
(rear).

• Terminal No. 2 of the right bank heated oxygen 

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

.

TECHNICAL DESCRIPTION

• The output signal of the right bank heated oxygen 

sensor (front) is compensated by the output sig-
nal of the right bank heated oxygen sensor (rear).

• The PCM checks for an open circuit in the right 

bank heated oxygen sensor (rear) output line.

.

DTC SET CONDITIONS

Check Conditions

• Engine coolant temperature is higher than 76°C 

(169

°F).

• The right bank heated oxygen sensor (front) is 

active.

• The cumulative volume airflow sensor output fre-

quency for every 2 seconds is higher than 4,000 
Hz.

• Repeat 3 or more times: drive

*1

, stop

*2

.

Drive

*1

• Engine speed is higher than 1,500 r/min.

• Volumetric efficiency is higher than 40 per-

cent.

• Vehicle speed is higher than 30 km/h (18.7 

mph).

• A total of more than 10 seconds have 

elapsed with the above mentioned condi-
tions, and more than 2 seconds have 
elapsed with the fuel shut off.

AK201275

CONNECTOR: C-14

C-14(GR)

AB

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

AK201049

D-14

AB

CONNECTOR: D-14

AK201049

CONNECTOR: D-116

D-116

AC

AK201038AF

CONNECTOR: D-135

PCM

D-135(GR)

AK201052

E-112

AB

CONNECTOR: E-112

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-178

Stop

*2

:

• Vehicle speed is lower than 1.5 km/h (0.9 

mph).

Judgement Criteria

• Change in the output voltage of the right bank 

heated oxygen sensor (rear) is lower than 0.313 
volt.

NOTE: Monitoring stops after fuel has been shut 
off for more than 38 seconds.

.

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

• Right bank heated oxygen sensor (rear) failed.

• PCM failed.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 69: 
Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).

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) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item 

69, Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).

(4) Warm up the engine.

• After increasing the output voltage 0.15 volt or more by 

the engine revving, finish it. Then confirm that the output 
voltage reduces to 0.15 volt or less within 3 seconds.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent. 

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

P.00-6

.

NO :  Replace the heated oxygen sensor (rear). Then go to 

Step 2. 

STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

GROUP 13A, Procedure 4 

− Heated Oxygen Sensor 

Monito

P.13Ab-2

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0139 set?

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

ACX01539

16-PIN

MB991502

AC

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-179

DTC P0141: Heated Oxygen Sensor Heater Circuit (bank 1, sensor 2)

TO PCM

TO PCM

WHITE-

BL

ACK

WHITE-

BL

ACK

AK201134

RED

YELL

OW

-BL

ACK

YELL

OW

-BL

ACK

RED

RIGHT BANK HEATED
OXYGEN SENSOR (REAR)

4

1 2
3

B-22X

3

2

4

1

BATTERY

4

12

9

6

10

17

18

29

2

3 4

7 8

19 20

30 31

12

11

24

33 34 35

21

32

27

26

36 37

28

38

25

13

15

14

16

23

22

1

5

E-114

1

3

2

4

24

MFI
RELAY

POWERTRAIN
CONTROL
MODULE (PCM)

4

3

1 2

C-14

MU802665

Right Bank Heated Oxygen Sensor (rear) Heater Circuit

1

2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

D-132

(MU803802)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-180

.

CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal 

No. 1) to the right bank heated oxygen sensor 
(rear) heater.

• The PCM (terminal No. 24) controls continuity to 

the right bank heated oxygen sensor (rear) 
heater by turning the power transistor in the PCM 
"ON" and "OFF".

.

BACKGROUND

• The PCM checks whether the heater current is 

within a specified range when the heater is ener-
gized.

.

DTC SET CONDITIONS

Check Conditions

• 60 seconds have elapsed from the start of the 

previous monitoring.

• Engine coolant temperature is higher than 20°C 

(68

°F).

• While the right bank heated oxygen sensor (rear) 

heater is on.

• Battery positive voltage is at between 11 and 16 

volts.

Judgment Criteria

• Heater current of the right bank heated oxygen 

sensor (rear) heater has continued to be lower 
than 0.16 ampere or higher than 5.0 ampere for 4 
seconds.

.

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

• Open or shorted right bank heated oxygen sen-

sor (rear) heater circuit.

• Open circuit in right bank heated oxygen sensor 

(rear) heater.

• PCM failed.

AK201039

MFI RELAY

B-22X

AB

CONNECTOR: B-22X

AK201275

CONNECTOR: C-14

C-14(GR)

AB

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

AK201038

CONNECTOR: D-132

AB

PCM

D-132(GR)

AK201052

CONNECTOR: E-114

E-114

AC

 

 

 

 

 

 

 

Content   ..  618  619  620  621   ..