Mitsubishi Galant (2004+). Manual - part 1022

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-905

STEP 5. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

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) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2135 set?

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

DTC P2138: Accelerator Pedal Position Sensor (main and sub) Circuit Range/Performance Problem

CAUTION

If DTC P2138 has been set, TCL related DTC
U1120 and U1400 are also set. After P2138 has
been diagnosed, don't forget to erase DTC U1120
and U1400.

ACCELERATOR PEDAL POSITION SENSOR
(MAIN AND SUB) RANGE/PERFORMANCE
PROBLEM CIRCUIT

• Refer to DTC P2122 − Accelerator Pedal Position

Sensor (main) Circuit

P.13A-865

• Refer to DTC P2127 − Accelerator Pedal Position

Sensor (sub) Circuit

P.13A-882

CIRCUIT OPERATION

• Refer to DTC P2122 − Accelerator Pedal Position

Sensor (main) Circuit

P.13A-865

• Refer to DTC P2127 − Accelerator Pedal Position

Sensor (sub) Circuit

P.13A-882

TECHNICAL DESCRIPTION

• PCM checks the accelerator pedal position sen-

sor output signal characteristics for abnormal
conditions.

DESCRIPTIONS OF MONITOR METHODS
Detect malfunction if the relation between accelera-

tor pedal position sensor (main) and accelerator
pedal position sensor (sub) is wrong.

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

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-906

DTC SET CONDITIONS

Logic Flow Chart

AK303910

START

END

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 1sec

{APS (SUB) +0.3V} -

APS (MAIN)

> =1.0V

MONITORING

CONDITIONS

AK303911

START

END

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 0.2secs

MONITORING

CONDITIONS

APS (MAIN) -

{APS (SUB) +0.3V}

> =1.0V

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-907

Check Condition

• Ignition switch is "ON" position.

• Accelerator pedal position sensor (main) output

voltage is between 0.6 and 4.8 volts.

• Accelerator pedal position sensor (sub) output

voltage is between 0.2 and 4.8 volts.

• Change of accelerator pedal position sensor

(sub) output voltage per 25 milliseconds is lower
than 0.06 volt.

Judgement Criteria

• Voltage obtained with the formula given below is

1.0 volt or higher for 1 second: [accelerator pedal
position sensor (sub) output voltage +0.3 volt]

−

accelerator pedal position sensor (main) output
voltage.
or

• Voltage obtained with the formula given below is

1.0 volt or higher for 0.2 second: [accelerator
pedal position sensor (main) output voltage

−

[accelerator pedal position sensor (sub) output
voltage +0.3 volt].

OBD-II DRIVE CYCLE PATTERN
None.

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

• Accelerator pedal position sensor failed.

• Harness damage in accelerator pedal position

sensor circuit or connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Check harness connector C-24 at accelerator
pedal position sensor for damage.

Q: Is the harness 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 16.

AK303906

6 5 4 3 2

C-24 (B)

CONNECTOR: C-24

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-908

STEP 2. Check the continuity at accelerator pedal position
sensor harness side connector C-24.

(1) Disconnect the connector C-24 and measure at the harness

side.

(2) Measure the continuity between terminal No. 2 and ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 6.
NO : Go to Step 3.

STEP 3. Check harness connector B-20 at PCM for
damage.

Q: Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 16.

AK303906

6 5 4 3 2

C-24 (B)

CONNECTOR: C-24

HARNESS CONNECTOR:
COMPONENT SIDE

6 5 4 3 2

AK203017

C-24 HARNESS
CONNECTOR:
COMPONENT SIDE

AK303092

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

CONNECTOR: B-20

B-20

PCM

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

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