Mitsubishi Evolution X. Manual - part 920

COMBINATION METER

TSB Revision

CHASSIS ELECTRICAL

54A-41

STEP 1. Using scan tool MB991958, read the ETACS-ECU 
diagnostic trouble code
Check if DTC is set to the ETACS-ECU.

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. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.54A-25

."

(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Troubleshoot the ETACS-ECU (Refer to 

P.54A-582

).

NO :  Go to Step 2.

STEP 2. Using scan tool MB991958, diagnose the CAN bus 
line.
(1) Turn the ignition switch to the "ON" position.
(2) Diagnose the CAN bus line.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

STEP 3. Combination meter operation check
Check that the combination meter works normally.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Check the power supply circuit of combination meter 

(Refer to 

P.54A-60

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

COMBINATION METER

TSB Revision

CHASSIS ELECTRICAL

54A-42

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the combination meter.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the combination meter.
NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to use 

Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

DTC U0019: Bus off (CAN-B)

CAUTION

• If DTC U0019 is set, be sure to diagnose the 

CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

If the CAN-B circuit malfunction occurs, the combina-
tion meter sets DTC U0019.

.

JUDGEMENT CRITERIA

With the ignition switch at the ON position and the 
system voltage at 10 

− 16 volts (data from 

ETACS-ECU), if the combination meter becomes 
unable to transmit data normally due to the CAN-B 
bus circuit malfunction, the combination meter deter-
mines that a problem has occurred.

.

TROUBLESHOOTING HINTS

The CAN bus line may be defective

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

COMBINATION METER

TSB Revision

CHASSIS ELECTRICAL

54A-43

STEP 1.Recheck for diagnostic trouble code.
Check again if the DTC is set to the combination meter.

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. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.54A-25

."

(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Go to Step 2.
NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to use 

Troubleshooting/inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

STEP 2. Using scan tool MB991958, diagnose the CAN bus 
line.
(1) Turn the ignition switch to the "ON" position.
(2) Diagnose the CAN bus line.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to use 

Troubleshooting/inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

DTC U0100: Engine control module CAN timeout

CAUTION

• If DTC U0100 is set, be sure to diagnose the 

CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

The combination meter sets DTC U0100 when it can-
not receive "CHECK ENGINE" signals from the 
engine control module.

.

JUDGEMENT CRITERIA

With the ignition switch in the ON position, system 
voltage between 10

−16 volts (data from 

ETACS-ECU), power supply fuse is OK, or odometer 
value is 80.5 km (50 miles) or more, and the commu-
nication with engine control module cannot be estab-
lished for 600 ms or more, the combination meter 
determines that a problem has occurred.

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

COMBINATION METER

TSB Revision

CHASSIS ELECTRICAL

54A-44

PROBABLE CAUSES

• The CAN bus line may be defective.

• The combination meter may be defective.

• The engine control module may be defective.

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the 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. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.54A-25

."

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

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

Diagnosis 

P.54C-14

).

STEP 2. Using scan tool MB991958, read the MFI 
diagnostic trouble code
Check if DTC is set to the engine control module.
Q: Is the DTC set?

YES : Troubleshoot the MFI (Refer to GROUP 13A, 

Diagnosis Code Chart 

P.13A-44

).

NO :  Go to Step 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB