Mitsubishi Montero (2004+). Manual — part 318

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-759

STEP 7. Using scan tool MB991958, check data list item 78:
Accelerator Pedal Position Sensor (main).

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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item

78, Accelerator Pedal Position Sensor (main).

• Output voltage is between 0.905 and 1.165 volts when

foot is released from accelerator pedal.

• Output voltage is 4.035 volts or higher when accelerator

pedal is fully depressed.

(4) 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 PCM. Then go to Step 8.

STEP 8. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2123 set?

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

AK302970

AB

MB991911

MB991824

MB991827

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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DTC P2126: Accelerator Pedal Position Sensor (Sub) Circuit Range/Performance Problem

.

Accelerator Pedal Position Sensor (Sub) Circuit
Range/Performance Problem Circuit

• Refer to DTC P2127 − Accelerator Pedal Position

Sensor (Sub) Circuit

P.13A-768

.

• Refer to Diagnostic Function − OBD-II Drive

Cycle

− Procedure 33 − Accelerator Pedal Posi-

tion Switch Circuit

P.13A-944

.

.

CIRCUIT OPERATION

• Refer to DTC P2127 − Accelerator Pedal Position

Sensor (Sub) Circuit

P.13A-768

.

• Refer to Diagnostic Function − OBD-II Drive

Cycle

− Procedure 33 − Accelerator Pedal Posi-

tion Switch Circuit

P.13A-944

.

.

TECHNICAL DESCRIPTION

• PCM checks the APS (sub) output signal charac-

teristics for abnormal conditions.

.

DESCRIPTIONS OF MONITOR METHODS

• Accelerator pedal position sensor (sub) output

voltage is greater than that the specified value
when the accelerator pedal position switch is on.

.

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)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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DTC SET CONDITIONS

Logic Flow Chart

.

Check Condition

• Ignition switch is "ON" position.

• Accelerator pedal position switch: ON

• Accelerator pedal position sensor (main) failure

detected.

Judgement Criteria

• Accelerator pedal position sensor (sub) output

voltage is 2.5 volts or higher for 1 second.

.

OBD-II DRIVE CYCLE PATTERN
None.

.

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

• APS failed.

• Harness damage, or connector damage in APS

(sub) circuit.

• Accelerator pedal position switch failed.

• Shorted accelerator pedal position switch circuit,

harness damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

START

END

NO

NO

YES

YES

Yes

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 1sec

OUTPUT VOLTAGE > =2.5V

MONITORING

CONDITIONS

AK302963

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 11.

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

D-138.

(2) Measure resistance between terminal No. 1 and No. 2 and

between terminal No. 7 and No. 8.

Standard value: 3.5

− 6.5 kΩ

(3) Measure resistance between terminal No. 2 and No. 3 and

between terminal No. 6 and No. 8.

(4) Move the accelerator pedal from the idle position to the

full-open position.

• Resistance value changes in accordance with the accel-

erator pedal depression smoothly.

Q: Is the resistance normal?

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

go to Step 11.

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

6 7 8

1 2 3 4 5

AK201450

ACCELERATOR PEDAL
POSITION SENSOR
SIDE CONNECTOR

AB

6 7 8

1 2 3 4 5

AK201451

ACCELERATOR PEDAL
POSITION SENSOR
SIDE CONNECTOR

AB