Mitsubishi Montero (2004+). Manual - part 178

 

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Mitsubishi Montero (2004+). Manual - part 178

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-199

• PCM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

• MD998464: Test Harness

STEP 1. Using scan tool MB991958, check data list item 39: 
Heated Oxygen Sensor Bank 1, Sensor 1 (right front).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.

(3) Set scan tool MB991958 to the data reading mode for item 

39, Heated Oxygen Sensor Bank 1, Sensor 1 (right front).

(4) Warm up the engine, 2,500 r/min.

• Output voltage repeats 0.4 volt or less and 0.6 − 1.0 volt 

10 times or more within 10 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 :  Go to Step 2.

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-200

STEP 2. Check the right bank heated oxygen sensor 
(front).

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

connector B-07 and connect test harness special tool 
MD998464 to the connector on the right bank heated 
oxygen sensor (front) 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 (front) 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 (front).

• Be careful the heater is broken when voltage of beyond 

8 volts is applied to the right bank heated oxygen sen-
sor (front) 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 (front) is normal, the output 
voltage 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 (front) with the positive terminal 
and the negative terminal of 8 volts power supply respec-
tively, then check again.

Q: Is the voltage between 0.6 and 1.0 volt?

YES : Go to Step 3.
NO :  Replace the right bank heated oxygen sensor (front). 

Then go to Step 4.

AK201274

1

2

3

4

CONNECTOR: B-07

B-07(B)

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

AKX01624

HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR

MD998464

WHITE

BLACK

AL

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-201

STEP 3. Check harness connector B-07 at right bank 
heated oxygen sensor (front) and harness connector 
D-135 at PCM for damage.

Q: Is the harness connector in good condition?

YES : Replace the PCM. Then go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 4.

STEP 4. 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 4 − 

Heated Oxygen Sensor Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0133 set?

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

AK201274

1

2

3

4

CONNECTOR: B-07

B-07(B)

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

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-202

DTC P0134: Heated Oxygen Sensor Circuit No Activity Detected (bank 1, sensor 1)

.

Heated Oxygen Sensor Circuit No Activity 
Detected (bank 1, sensor 1) Circuit

• Refer to DTC P0130 − Right Bank Heated Oxy-

gen Sensor (Front) Circuit 

P.13A-167

.

• Refer to, DTC P0201, P0202, P0203, P0204, 

P0205, P0206 

− Injector Circuit 

P.13A-421

.

.

CIRCUIT OPERATION

• Refer to DTC P0132 − Right Bank Heated Oxy-

gen Sensor (Front) Circuit 

P.13A-191

.

• Refer to, DTC P0201, P0202, P0203, P0204, 

P0205, P0206 

− Injector Circuit 

P.13A-421

.

.

TECHNICAL DESCRIPTION

• The PCM effects air/fuel ratio feedback control in 

accordance with the signals from the right bank 
heated oxygen sensor (front).

• If the right bank heated oxygen sensor (front) has 

deteriorated, corrections will be made by the right 
bank heated oxygen sensor (rear).

• DTC P0134 becomes stored in memory if a fail-

ure is detected in the above air/fuel ratio feed-
back control system.

.

DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (front) output volt-

age does not cross 0.5 volt within specified 
period.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Misfire monitor

Sensor (The sensor below is determined to be 

normal)

• Volume airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

.

 

 

 

 

 

 

 

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