Mitsubishi Lancer Evolution X. Manual - part 362

 

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Mitsubishi Lancer Evolution X. Manual - part 362

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-513

STEP 2. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function − OBD-II Drive Cycle − Pattern 23 

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q:  Is DTC P0463 set?

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

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

P.42B-11

 or GROUP 42C, ID Code 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 23 

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0463 set?

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

DTC P0500: Vehicle Speed Signal Malfunction

.

TECHNICAL DESCRIPTION

• The ECM receives the vehicle speed signal from 

the ASC-ECU by the CAN bus line.

.

DESCRIPTIONS OF MONITOR METHODS

When the signal not available as the vehicle speed 
information send from ASC-ECU, a malfunction is 
determined to have occurred.

.

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)

• Mass airflow sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-514

DTC SET CONDITIONS (Entry Conditions 
and Malfunction Thresholds)

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed since the engine 

starting sequence was completed.

• Battery positive voltage is between 10 and 16.5 

volts.

Judgement Criterion

• Vehicle speed information from ASC-ECU is fail 

for 2 seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-II DRIVE CYCLE PATTERN

None

.

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

• Wheel speed sensor of ASC system failed.
• ASC-ECU failed.
• ECM failed.

AK704731

Start

Yes

Yes

Yes

No

No

No

Vehicle speed information

from ASC-ECU is fail*

*The fail signal is sent when ASC-ECU detects all four
 wheel speed sensors failures.

Continuous

failure for 2secs

Malfunction

End

Good

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-515

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-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) Set scan tool MB991958, read the ASC-DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the ASC-DTC set?

YES : Refer to GROUP 35C, Active Stability Control System 

− Diagnostic Trouble Code Chart 

P.35C-22

.

NO :  Go to Step 2.

STEP 2. Check the speedometer.
Q: Is the indication of speedometer normal?

YES : Go to Step 3.
NO :  Replace the ASC-ECU.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-516

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the DTC has been deleted, read the DTC again.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0500 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 P0506: Idle Control Sytem RPM Lower Than Expected

.

TECHNICAL DESCRIPTION

• The amount of air taken in during idling is regu-

lated by the opening and closing of the throttle 
valve.

• The ECM checks the difference between the 

actual engine speed and the target engine speed.

.

DESCRIPTIONS OF MONITOR METHODS

Difference between actual and target idle speed is 

over the specified value.

.

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)

• Misfire monitor
• Fuel system monitor
• Vehicle speed signal monitor

Sensor (The sensor below is determined to be 

normal)

• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor

.

 

 

 

 

 

 

 

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