Mitsubishi Lancer Evolution X. Manual - part 402

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-673

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 − Pattern 22 

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P2195 set?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 3.

NO :  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.00-15

.

STEP 3. 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 − Pattern 22 

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P2195 set?

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

DTC P2228: Barometric Pressure Circuit Low Input

.

TECHNICAL DESCRIPTION

• The barometric pressure sensor outputs a volt-

age which corresponds to the barometric pres-
sure.

• The ECM 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

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-674

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 8 volts or higher.

Judgement Criterion

• 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.

.

FAIL-SAFE AND BACKUP FUNCTION

• Control as if the barometric pressure is 101kPa.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 23 

P.13A-9

.

.

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

• ECM failed. 

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A

AK704299

Good

Malfunction

End

No

No

No

No

Barometric pressure

< 49kPa (14.5 in. Hg)

Barometric pressure

> 113kPa (33.4 in. Hg)

Start

Yes

Yes

Yes

Yes

Continuous

failure for 10secs

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-675

STEP 1. Test the OBD-II drive cycle.

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) Carry out the test drive with the drive cycle pattern. Refer to 

DIagnostic Function − OBD-II Drive Cycle − Pattern 23 

P.13A-9

.

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

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. 

NO :  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.00-15

.

DTC P2229: Barometric Pressure Circuit High Input

.

TECHNICAL DESCRIPTION

• The barometric pressure sensor outputs a volt-

age which corresponds to the barometric pres-
sure.

• The ECM 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

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-676

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 8 volts or higher.

Judgement Criterion

• Barometric pressure sensor output signal has 

continued to be 113 kPa (33.4 in.Hg) or higher 
(approximately 4,000 ft below sea level) for 10 
seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• Control as if the barometric pressure is 101kPa.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 23 

P.13A-9

.

.

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

• ECM failed. 

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A

AK704299

Good

Malfunction

End

No

No

No

No

Barometric pressure

< 49kPa (14.5 in. Hg)

Barometric pressure

> 113kPa (33.4 in. Hg)

Start

Yes

Yes

Yes

Yes

Continuous

failure for 10secs

Monitoring
conditions