Mitsubishi Montero (2004+). Manual — part 364

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-943

STEP 3. Check the circuit at PCM connector D-134.
(1) Disconnect the connectors D-134 and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 69 and ground.

• Voltage should be 1 volt or less when the A/C switch is

"OFF".

• Voltage should be battery positive voltage when the A/C

switch is "ON".

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Refer to GROUP 55, Diagnosis

− Introduction To

Heater, Air Conditioning And Ventilation Diagnosis

P.55A-5

.

AK201166

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CONNECTOR: D-134

AB

PCM

D-134(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

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AK201388

D-134 HARNESS

CONNECTOR:

COMPONENT SIDE

AK201388AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-944

INSPECTION PROCEDURE 33: Accelerator Pedal Position Switch

.

CIRCUIT OPERATION

• A 5-volt voltage is applied on the accelerator

pedal position switch output terminal (terminal
No. 4) from the PCM (terminal No. 38) via the
resistor in the PCM.

• The ground terminal (terminal No.5) is grounded

with PCM (terminal No.96).

.

YELLO

W

-BLA

CK

BLA

CK

AK201165

ACCELERATOR PEDAL

POSITION

SWITCH (BUILT INTO

ACCELERATOR

PEDAL

POSITION SENSOR)

POWERTRAIN CONTROL MODULE(PCM)

5V

96

38

4

5

D-138

(MU802073)

31

35363738394041 42 43
444546474849

50 51

5253

545556

57 58

32

33 34

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-133

(MU803803)

D-135

(MU803805)

Accelerator Pedal Position Switch Circuit

6 7 8

1 2 3 4 5

AK200944AC

CONNECTOR: D-138

ACCELERATOR
PEDAL
POSITION
SWITCH

D-138(GR)

AK201038AL

CONNECTORS: D-133, D-135

PCM

D-135(GR)

D-133(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-945

COMMENT

• Accelerator pedal position switch turns OFF

when the amount of travel of the accelerator
pedal exceeds the prescribed value.

• PCM uses the signal that is input by the accelera-

tor pedal position switch for determining the
abnormal characteristics of the accelerator pedal
position sensor (sub).

.

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

• Accelerator pedal position switch failed.

• Open or shorted accelerator pedal position switch

circuit, or loose connector.

• PCM failed.

DIAGNOSIS

STEP 1. Check connector D-138 at accelerator pedal
position switch for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 2. Check the accelerator pedal position switch.
(1) Disconnect the accelerator pedal position switch connector

D-138.

(2) Check for continuity between the accelerator pedal position

switch side connector terminal No. 4 and No. 5.

• There should be continuity when the accelerator pedal

is not depressed. (400 ohms or less)

• There should be continuity when the accelerator pedal

is depressed.

Q: Does continuity exist?

YES : Go to Step 3.
NO : Replace the accelerator pedal position sensor

P.17-8

.

After converting the accelerator pedal position sensor,
adjust the accelerator pedal position sensor

P.13A-994

. Confirm that the malfunction symptom is

eliminated.

AK200945

3

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5

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AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

AK200945

3

4

5

1

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7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

1 2 3 4 5 6 7 8

AK201309 AC

Equipment side
connector

ACCELERATOR PEDAL
POSITION SWITCH

ACCELERATOR
PEDAL

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-946

STEP 3. Measure the switch supply voltage at accelerator
pedal position switch connector D-138.
(1) Disconnect the accelerator pedal position switch connector

D-138.

(2) Measure the voltage between terminal No. 4 and ground.

• Voltage should be 4 volts or more.

Q: Is the voltage normal?

YES : Go to Step 6.
NO : Go to Step 4.

STEP 4. Check connector D-133 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Confirm that the

malfunction system is eliminated.

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

3

4

5

1

2

8

6

7

AK201398

D-138 HARNESS
CONNECTOR:
COMPONENT SIDE

AK201398AB

AK200939

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AB

CONNECTOR: D-133

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-133(GR)