Mitsubishi Evolution X. Manual — part 1007

MMCS

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CHASSIS ELECTRICAL

54A-389

STEP 4. Check the wiring harness between CAN box unit
connector C-15 (terminal 4, 5, 6) and multivision display
connector C-10 (terminal 49, 33, 38).
Q: Is the wiring harness between CAN box unit connector

C-15 (terminal 4, 5, 6) and multivision display connector
C-10 (terminal 49, 33, 48) in good condition?
YES : Go to Step 5.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the CAN box unit.
(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 : Go to Step 6.
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 6. Recheck for diagnostic trouble code.
Temporarily replace the multivision display, and check if the
DTC is set to the CAN box unit.
(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 CAN box unit.
NO : Replace the multivision display.

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CHASSIS ELECTRICAL

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DTC B2477: VIN not programmed

CAUTION

• If DTC B2477 is set, be sure to diagnose the

CAN bus line.

• When replacing the ECU, always check that

the communication circuit is normal. (Check
that the voltage is 10 V or more.)

.

TROUBLE JUDGMENT

With the ignition switch at the ON position, if the VIN
code is not written to the CAN box unit, DTC B2477
is stored.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective.

• The ETACS-ECU may be defective.

• The CAN box unit 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-382

."

(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 ETACS-ECU
diagnostic trouble code
Check again if the DTC is set to the ETACS-ECU.
Q: Is the DTC set?

YES : Troubleshoot the ETACS-ECU (Refer to

P.54A-582

).

NO : Go to Step 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

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CHASSIS ELECTRICAL

54A-391

STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the CAN box unit.
(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 CAN box unit.
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. (Check
that the voltage is 10 V or more.)

.

DIAGNOSTIC FUNCTION

If the CAN-B circuit malfunction occurs, the CAN box
unit sets DTC U0019.

.

JUDGMENT CRITERIA

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

− 16 volts (data from

ETACS-ECU), if the CAN box unit becomes unable
to transmit data normally due to the CAN-B bus cir-
cuit malfunction, the CAN box unit determines 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)

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CHASSIS ELECTRICAL

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STEP 1. Recheck for diagnostic trouble code.
Check again if the DTC is set to the CAN box unit.

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-382

."

(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 U0141: ETACS CAN timeout

CAUTION

• If DTC U0141 is set, be sure to diagnose the

CAN bus line.

• When replacing the ECU, always check that

the communication circuit is normal. (Check
that the voltage is 10 V or more.)

.

DIAGNOSTIC FUNCTION

If the signal from ETACS-ECU cannot be received,
the CAN box unit sets the DTC U0141.

.

JUDGMENT 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 ETACS-ECU cannot be established for
2,500 ms or more, the CAN box unit determines that
a problem has occurred.

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB