Mitsubishi Galant 9G. Manual - part 876

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-946

STEP 14. Check for harness damage between accelerator
pedal position sensor connector C-24 (terminal No. 6) and
PCM connector B-20 (terminal No. 27).
Q: Is the harness wire in good condition?

YES : Go to Step 15.
NO : Repair it. Then go to Step 16.

STEP 15. 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 P2138 set?

YES : Replace the PCM. Then go to Step 16.
NO : The inspection is complete.

AK303906

6 5 4 3 2

C-24 (B)

CONNECTOR: 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

AK303906

6 5 4 3 2

C-24 (B)

CONNECTOR: C-24

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-947

STEP 16. 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 P2138 set?

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

DTC P2228: Barometric Pressure Circuit Low Input

CAUTION

If DTC P2228 has been set, TCL related DTC
U1120 is also set. After P2228 has been diag-
nosed, don't forget to erase DTC U1120.

TECHNICAL DESCRIPTION

• The barometric pressure sensor outputs a volt-

age which corresponds to the barometric pres-
sure.

• The PCM checks whether this voltage is within a

specified range.

DESCRIPTIONS OF MONITOR METHODS

Barometric pressure sensor output voltage is out of

reasonable barometric pressure 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

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-948

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• 2 seconds or more have passed since the engine

starting sequence was completed.

• Battery positive voltage is higher than 8 volts.

Judgement Criteria

• Barometric pressure sensor output signal has

continued to be 49 kPa (14.5 in.Hg) or lower
(approximately 15,000 ft above sea level) for 10
seconds.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13A-6

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

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

START

END

YES

MALFUNCTION

GOOD

YES

AK401684

MONITORING

CONDITIONS

BAROMETRIC PRESSURE

< 49kPa (14.5in.Hg)

CONTINUOUS

FAILURE FOR

10secs

BAROMETRIC PRESSURE

> 113kPa (33.4in.Hg)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-949

STEP 1. Using scan tool MB991958, check data list item 25:
Barometric Pressure Sensor.

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

25, Barometric Pressure Sensor.

• When altitude is 0 m (0 foot), 101 kPa (29.8 In.Hg).

• When altitude is 600 m (1,969 feet), 95 kPa (28.1

In.Hg).

• When altitude is 1,200 m (3,937 feet), 88 kPa (26.0

In.Hg).

• When altitude is 1,800 m (5,906 feet), 81 kPa (23.9

In.Hg).

(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 : Replace the PCM, then go to Step 2.

STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Procedure 6 −

Other Monitor

P.13A-6

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P2228 set?

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

DTC P2229: Barometric Pressure Circuit High Input

CAUTION

If DTC P2229 has been set, TCL related DTC
U1120 is also set. After P2229 has been diag-
nosed, don't forget to erase DTC U1120.

TECHNICAL DESCRIPTION

• The barometric pressure sensor outputs a volt-

age which corresponds to the barometric pres-
sure.

• The PCM checks whether this voltage is within a

specified range.

DESCRIPTIONS OF MONITOR METHODS

Barometric pressure sensor output voltage is out of

reasonable barometric pressure 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

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

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