Mitsubishi Galant (2004+). Manual — part 1302

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-901

Check Conditions

• Ignition switch is "ON" position.

Judgement Criteria

• Accelerator pedal position sensor (main) output

voltage should be 4.8 volts or higher for 0.3 sec-
ond.

.

OBD-II DRIVE CYCLE PATTERN
None.

.

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

• Accelerator pedal position sensor failed.

• Open accelerator pedal position sensor (main)

circuit, harness damage 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. 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 0.7 and 1.3 volts when foot is

released from accelerator pedal.

• Output voltage is 4.0 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 : Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-902

STEP 2. Check harness connector C-24 at accelerator
pedal position sensor for damage.

Q: Is the harness 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 go to Step 8.

STEP 3. 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 4.

AK303202

1

6 5 4 3 2

ACCELERATOR
PERAL

AB

CONNECTOR: C-24

C-24 (B)

ACCELERATOR
PEDAL POSITION
SENSOR

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303202

1

6 5 4 3 2

ACCELERATOR
PERAL

AB

CONNECTOR: C-24

C-24 (B)

ACCELERATOR
PEDAL POSITION
SENSOR

HARNESS
CONNECTOR:
COMPONENT SIDE

1

6 5 4 3 2

AK303204

C-24 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-903

STEP 4. Check harness connector B-20 at PCM for
damage.

Q: Is the harness connector in good condition?

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

Connector Inspection

P.00E-2

. Then go to Step 8.

AK303092

25

21

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

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-904

STEP 5. Check for open circuit and harness damage
between accelerator pedal position sensor connector C-24
(terminal No. 2) and PCM connector B-20 (terminal No. 31).

Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO : Repair it. Then go to Step 8.

STEP 6. Replace the accelerator pedal position sensor.

(1) Replace the accelerator pedal position sensor.
(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 : Replace the PCM. Then go to Step 8.
NO : The procedure is complete.

AK303202

1

6 5 4 3 2

ACCELERATOR
PERAL

AB

CONNECTOR: C-24

C-24 (B)

ACCELERATOR
PEDAL POSITION
SENSOR

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303092

25

21

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

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

AK303202

1

6 5 4 3 2

ACCELERATOR
PERAL

AB

CONNECTOR: C-24

C-24 (B)

ACCELERATOR
PEDAL POSITION
SENSOR

HARNESS
CONNECTOR:
COMPONENT SIDE