Mitsubishi Lancer Evolution X. Manual - part 407

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-693

STEP 5. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC

again.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0121 set?

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

P.42B-11

or GROUP 42C, ID Codes

Registration Judgment Table <Vehicles with WCM>

P.42C-9

. Then go to Step 6.

NO : It can be assumed that this malfunction is intermittent

of CAN bus line between ECM and ASC-ECU. Refer
to GROUP 00, How to Use
Troubleshooting/Inspection Service Points − How to

Cope with Intermittent Malfunctions

P.00-15

STEP 6. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC

again.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0121 set?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-694

13A

DTC U0141: ETACS-ECU Time-out

CAUTION

• If the ECM output the DTC U0141, make sure

to diagnose the CAN bus line.

• Before replacing the ECU, make sure that the

communication circuit is operating normally.

DESCRIPTIONS OF MONITOR METHODS

There is no data from ETACS-ECU for the specified
time. (ETACS-ECU also detect communication error
with ECM.)

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

AK604369

Start

Yes

Continuous failure

for specified time

Malfunction

End

Good

Monitoring
conditions

Communication status

fails

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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Check Condition

• Battery positive voltage is between 10 and 16.5

volts.

Judgement Criterion

• Unable to receive ETACS-ECU signals through

the CAN bus line for 4 seconds.

COMMENT

Current Trouble

• Some of the possible causes are a harness or

connector damage between the ECM and the
ETACS-ECU on the CAN bus line, a failure in the
ETACS-ECU power supply system, a failure in
the ETACS-ECU, or a failure in the ECM.

Past Trouble

• Proceed to troubleshoot based on a harness or

connector damage on the CAN bus line between
the ECM and ETACS-ECU, and a failure in the
ETACS power supply system. Refer to "How to
cope with past trouble" (Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points − How to Treat Past Trouble

P.00-16

NOTE: If a malfunction occurred in the past, a failure
cannot be discovered through the MB991958 CAN
bus diagnosis even if there might be a problem with
the CAN bus. In this case, refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-15

Furthermore, it is possible to narrow down the areas
of the possible failures from the DTCs that are output
by the ECUs, which are communicating on the CAN
bus (Refer to GROUP 54C, CAN bus line Diagnos-
tics Flow

P.54C-11

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:)

• CAN line harness damage or connector damage.
• ETACS-ECU failed.
• 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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-696

STEP 1. Using scan tool MB991958, diagnose CAN bus
line.

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) Diagnose CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line normal?

YES : Go to Step 2.
NO : Repair the CAN bus line. Refer to GROUP 54C, Can

Bus Diagnostics Table

P.54C-17

. Then go to Step 6.

STEP 2. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Read the ETACS-DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the ETACS-DTC set?

YES : Refer to GROUP 54A, ETACS − Diagnostic Trouble

Code Chart

P.54A-106

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Read the S-AWC-DTC, TC-SST-DTC, Shift lever-DTC,

ASC-DTC, KOS-DTC or WCM-DTC, SRS-DTC, Occupant
classification-DTC, Combination meter-DTC, Radio and CD
player or CD changer-DTC, CAN box unit-DTC, Hands-free
module-DTC, Satellite radio tuner-DTC and A/C-DTC.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0141 set?

YES : Go to Step 4.
NO : Go to Step 5.

AC608435

Data link connector

MB991827

MB991824

MB991910

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