Mitsubishi Galant (2004+). Manual - part 1313

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-945

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, 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) Erase the DTC.
(4) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13B-5

.

(5) Check the diagnostic trouble code (DTC).
Q: Is DTC P2227 set?

YES : Replace the PCM.
NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

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

.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-946

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 approximately 50 kPa (14.8 
in.Hg) or lower (approximately 15,000 feet above 
sea level) for 10 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-5

.

.

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

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

NO

YES

AK302378

MONITORING

CONDITIONS

BAROMETRIC PRESSURE

< 50kPa (14.8in.Hg)

BAROMETRIC PRESSURE

> 113kPa (33.4in.Hg)

CONTINUOUS

FAILURE FOR 10secs

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-947

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 

P.00-6

.

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.13B-5

.

(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

.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-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 approximately 113 kPa (33.4 
in.Hg) or higher (approximately 4,000 ft below 
sea level) for 10 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-5

.

.

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

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

NO

YES

AK302378

MONITORING

CONDITIONS

BAROMETRIC PRESSURE

< 50kPa (14.8in.Hg)

BAROMETRIC PRESSURE

> 113kPa (33.4in.Hg)

CONTINUOUS

FAILURE FOR 10secs