Mitsubishi Galant 9G. Manual — part 865

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-902

STEP 11. 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 P2122 set?

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

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-903

DTC P2123: Accelerator Pedal Position Sensor (main) Circuit High Input

CAUTION

If DTC P2123 has been set, TCL related DTC
U1120 and U1400 are also set. After P2123 has
been diagnosed, don't forget to erase DTC U1120
and U1400.

.

22

21

23 24 25

26 27 28 29

30 31 32 33 34

35 36 37 38

39 40 41 42 43

6

1 2 3 4 5

AK303903

YELLO

W

-GREEN

GRA

Y

BR

O

W

N-WHITE

C-24

5 V

30

1

ACCELERATOR PEDAL

POSITION SENSOR
(MAIN)

POWERTRAIN CONTROL
MODULE (PCM)

26

31

3

2

Accelerator Pedal Position Sensor (main) Circuit

B-20

HALL IC

AC305244

AK303904AB

ACCELERATOR
PEDAL POSITION
SENSOR

CONNECTOR: C-24

C-24 (B)

AK303085

CONNECTOR: B-20

PCM

AB

AIR CLEANER

B-20

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-904

CIRCUIT OPERATION

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

tor pedal position sensor (main) power terminal
(terminal No. 1) from the PCM (terminal No. 30).
The ground terminal (terminal No. 2) is grounded
with PCM (terminal No. 31).

.

TECHNICAL DESCRIPTION

• The accelerator pedal position sensor (main) 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 (main) 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>

13A-905

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 0.735 and 1.335 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

− How to

Cope with Intermittent Malfunctions

P.00-14

.

NO : Go to Step 2.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827