Mitsubishi Galant (2004+). Manual — part 1019

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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CIRCUIT OPERATION

• A 5-volt power supply is applied on the accelera-

tor pedal position sensor (sub) power terminal
(terminal No. 4) from the PCM (terminal No. 21).
The ground terminal (terminal No. 5) is grounded
with PCM (terminal No. 22).

.

TECHNICAL DESCRIPTION

• The accelerator pedal position sensor (sub) out-

puts voltage which corresponds to the accelera-
tor pedal depression.

• The PCM checks whether the voltage is within a

specified range.

.

DESCRIPTIONS OF MONITOR METHODS
Accelerator pedal position sensor (sub) output volt-

age is out of specified range.

.

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

.

DTC SET CONDITIONS

Logic Flow Chart

.

AK303907

START

END

NO

NO

YES

YES

YES

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 0.3sec

OUTPUT VOLTAGE > =4.8V

MONITORING

CONDITIONS

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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Check Conditions

• Ignition switch is "ON" position.

Judgement Criteria

• Accelerator pedal position sensor (sub) output

voltage is 4.8 volts or higher for 0.3 second.

.

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 (sub) cir-

cuit, 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 77:
Accelerator Pedal Position Sensor (sub).

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

77, Accelerator Pedal Position Sensor (sub).

• Output voltage is between 0.4 and 1.0 volts when foot is

released from accelerator pedal.

• Output voltage is 3.7 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.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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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. 5 and ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

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

AK303906

1

6 5 4 3 2

AB

C-24 (B)

CONNECTOR: C-24

HARNESS CONNECTOR:
COMPONENT SIDE

AK303906

1

6 5 4 3 2

AB

C-24 (B)

CONNECTOR: C-24

HARNESS CONNECTOR:
COMPONENT SIDE

1

6 5 4 3 2

AK203020

C-24 HARNESS
CONNECTOR:
COMPONENT SIDE

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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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