Mitsubishi Galant 9G. Manual - part 873

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-934

DTC SET CONDITIONS

Logic Flow Chart

AK303910

START

END

NO

NO

YES

YES

YES

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 1sec

{APS (SUB) +0.3V} -

APS (MAIN)

> =1.0V

MONITORING

CONDITIONS

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-935

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.

AK303911

START

END

NO

NO

YES

YES

YES

NO

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-936

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.

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.

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

AK203017

C-24 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-937

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.

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