Mitsubishi Montero (2002-2004). Manual - part 558

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13Aa-19

ACCELERATOR PEDAL POSITION SWITCH
CHECK

M1131052500012

1. Disconnect the accelerator pedal position sensor connector.
2. Check continuity between terminal No. 4 (accelerator pedal

position switch) and No. 5 (sensor earth) of the connector.

Normal condition:

3. If defective, replace the accelerator pedal position sensor

assembly.
NOTE: After replacement, adjust the accelerator pedal posi-
tion sensor. (Refer to

P.13Aa-12

HEATED OXYGEN SENSOR CHECK

M1131005000323

Required Special Tools:

• MB991316: Test Harness Set

• MD998464: Test Harness

<Left bank heated oxygen sensor (front)>
1. Using scan tool MB991502, observe HO

S reading. If

values are unsatisfactory, or if a scan tool is not available,
use the following procedure:

(1) Disconnect the heated oxygen sensor connector and

connect special tool MB991316 to the connector on the
heated oxygen sensor side.

(2) Make sure that there is continuity [4.5-8.0 kiloohms at

°C (68°F)] between terminal No. 1 (red clip of special

tool) and terminal No. 3 (blue clip of special tool) on the
heated oxygen sensor connector

(3) If there is no continuity, replace the heated oxygen

sensor.

(4) Warm up the engine until engine coolant is 80

°C (176°F)

or higher.

CAUTION

Be very careful when connecting the jumper wires; incor-
rect connection can damage the heated oxygen sensor.

(5) Use the jumper wires to connect terminal No. 1 (red clip)

of the heated oxygen sensor connector to the positive
battery terminal and terminal No. 3 (blue clip) to the
negative battery terminal.

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

(black clip) and terminal No. 4 (white clip).

2. While repeatedly revving the engine, measure the heated

oxygen sensor output voltage.

Accelerator pedal

Continuity

Depressed

No continuity

Released

Continuity (0 k

Ω)

1 2 3 4 5 6 7 8

AK201309 AC

Equipment side
connector

ACCELERATOR PEDAL
POSITION SWITCH

ACCELERATOR
PEDAL

AKX01624 AB

MB991316

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

BLUE

RED

AKX01625 AB

BLUE

JUMPER
WIRES

BLACK

RED

WHITE

MB991316

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13Aa-20

Standard value:

3. If the sensor is defective, replace the heated oxygen sensor.
NOTE: For removal and installation of the heated oxygen sen-
sor, refer to GROUP 15, Exhaust Pipe and Main Muffler

P.15-

<Right bank heated oxygen sensor (front)>
1. Using scan tool MB991502, observe HO

S reading. If

values are unsatisfactory, or if a scan tool is not available,
use the following procedure:

(1) Disconnect the heated oxygen sensor connector and

connect special tool MD998464 to the connector on the
heated oxygen sensor side.

(2) Make sure that there is continuity [4.5-8.0 kiloohms at

°C (68°F)] between terminal No. 1 (red clip of special

tool) and terminal No. 3 (blue clip of special tool) on the
heated oxygen sensor connector

(3) If there is no continuity, replace the heated oxygen

sensor.

(4) Warm up the engine until engine coolant is 80

°C (176°F)

or higher.

CAUTION

Be very careful when connecting the jumper wires; incor-
rect connection can damage the heated oxygen sensor.

(5) Use the jumper wires to connect terminal No. 1 (red clip)

of the heated oxygen sensor connector to the positive
battery terminal and terminal No. 3 (blue clip) to the
negative battery terminal.

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

(black clip) and terminal No. 4 (white clip).

2. While repeatedly revving the engine, measure the heated

oxygen sensor output voltage.

ENGINE

HEATED OXYGEN
SENSOR OUTPUT
VOLTAGE

REMARKS

When revving
engine

0.6

− 1.0 V

If you make the air/
fuel ratio rich by
revving the engine
repeatedly, a
normal heated
oxygen sensor will
output a voltage of
0.6

− 1.0 V.

AKX01624

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

MD998464

BLUE

RED

AKX01625AC

BLUE

RED

BLACK

JUMPER
WIRES

WHITE

MD998464

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13Aa-21

Standard value:

3. If the sensor is defective, replace the heated oxygen sensor.
NOTE: For removal and installation of the heated oxygen sen-
sor, refer to GROUP 15, Exhaust Pipe and Main Muffler

P.15-

<Left bank heated oxygen sensor (rear)>
1. Using scan tool MB991502, observe HO

S reading. If

values are unsatisfactory, or if a scan tool is not available,
use the following procedure:

(1) Disconnect the heated oxygen sensor connector and

connect special tool MD998464 to the connector on the
heated oxygen sensor side.

(2) Make sure that there is continuity [11 - 18 kiloohms at

°C (68°F)] between terminal No. 1 (red clip of special

tool) and terminal No. 3 (blue clip of special tool) on the
heated oxygen sensor connector

(3) If there is no continuity, replace the heated oxygen

sensor.

(4) Warm up the engine until engine coolant is 80

°C (176°F)

or higher.

CAUTION

Be very careful when connecting the jumper wires; incor-
rect connection can damage the heated oxygen sensor.

(5) Use the jumper wires to connect terminal No. 1 (red clip)

of the heated oxygen sensor connector to the positive
battery terminal and terminal No. 3 (blue clip) to the
negative battery terminal.

(6) Connect a digital voltage meter between terminal 2 (black

clip) and terminal No. 4 (white clip).

2. While repeatedly revving the engine, measure the heated

oxygen sensor output voltage.

ENGINE

HEATED OXYGEN
SENSOR OUTPUT
VOLTAGE

REMARKS

When revving
engine

0.6

− 1.0 V

If you make the air/
fuel ratio rich by
revving the engine
repeatedly, a
normal heated
oxygen sensor will
output a voltage of
0.6

− 1.0 V.

AKX01624

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

MD998464

BLUE

RED

AKX01625AC

BLUE

RED

BLACK

JUMPER
WIRES

WHITE

MD998464

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13Aa-22

Standard value:

3. If the sensor is defective, replace the heated oxygen sensor.
NOTE: For removal and installation of the heated oxygen sen-
sor, refer to GROUP 15, Exhaust Pipe and Main Muffler

P.15-

<Right bank heated oxygen sensor (rear)>
1. Using scan tool MB991502, observe HO

S reading. If

values are unsatisfactory, or if Scan tool is not available, use
the following procedure:

(1) Disconnect the heated oxygen sensor connector and

connect special tool MB991316 to the connector on the
heated oxygen sensor side.

(2) Make sure that there is continuity [11-18 kiloohms at

°C (68°F)] between terminal No. 1 (red clip of special

tool) and terminal No. 3 (blue clip of special tool) on the
heated oxygen sensor connector

(3) If there is no continuity, replace the heated oxygen

sensor.

(4) Warm up the engine until engine coolant is 80

°C (176°F)

or higher.

CAUTION

Be very careful when connecting the jumper wires; incor-
rect connection can damage the heated oxygen sensor.

(5) Use the jumper wires to connect terminal No. 1 (red clip)

of the heated oxygen sensor connector to the positive
battery terminal and terminal No. 3 (blue clip) to the
negative battery terminal.

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

(black clip) and terminal No. 4 (white clip).

2. While repeatedly revving the engine, measure the heated

oxygen sensor output voltage.

ENGINE

HEATED OXYGEN
SENSOR OUTPUT
VOLTAGE

REMARKS

When revving
engine

0.6

− 1.0 V

If you make the air/
fuel ratio rich by
revving the engine
repeatedly, a
normal heated
oxygen sensor will
output a voltage of
0.6

− 1.0 V.

AKX01624 AB

MB991316

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

BLUE

RED

AKX01625 AB

BLUE

JUMPER
WIRES

BLACK

RED

WHITE

MB991316

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