Mitsubishi Evolution X. Manual — part 1009

MMCS

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CHASSIS ELECTRICAL

54A-397

STEP 2. Using scan tool MB991958, read the occupant
classification-ECU diagnostic trouble code.
Check if DTC is set to the occupant classification-ECU.
Q: Is the DTC set?

YES : Troubleshoot the SRS (Refer to GROUP 52B,

Diagnosis

P.52B-297

).

NO : Go to Step 3.

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 U0155: Meter CAN timeout

CAUTION

• If DTC U0155 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

When the signals from combination meter cannot be
received, the CAN box unit sets DTC U0155.

.

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-
nications with combination meter cannot be estab-
lished for 2,500 ms or more, the CAN box unit
determines that a problem has occurred.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective.

• The CAN box unit may be defective.

• The combination meter may be defective.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

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CHASSIS ELECTRICAL

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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 combination
meter diagnostic trouble code.
Check whether a combination meter DTCs are set or not.
(1) Turn the ignition switch to the "ON" position.
(2) Check for combination meter DTCs.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the combination meter (Refer to

combination meter, Diagnosis

P.54A-28

).

NO : Go to Step 3.

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

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

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CHASSIS ELECTRICAL

54A-399

DTC U0164: A/C CAN timeout

CAUTION

• If DTC U0164 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 A/C-ECU cannot be received, the
CAN box unit sets DTC U0164.

.

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

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective.

• The A/C-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-384

."

(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

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

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CHASSIS ELECTRICAL

54A-400

STEP 2. Using scan tool MB991958, read the A/C
diagnostic trouble code.
Check if DTC is set to the A/C-ECU.
Q: Is the DTC set?

YES : Troubleshoot the A/C (Refer to GROUP 55, Diagnosis

P.55-9

).

NO : Go to Step 3.

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 U0168: WCM CAN timeout

CAUTION

• If DTC U0168 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 KOS-ECU <vehicles with KOS> or
WCM <vehicles with WCM> cannot be received, the
CAN box unit sets DTC U0168.

.

JUDGMENT CRITERIA

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

− 16 V (data from ETACS-ECU),

power supply fuse is OK, or odometer value is 80.5
km (50 miles) or more, and the communication with
KOS-ECU <vehicles with KOS> or WCM <vehicles
with WCM> cannot be established for 2,500 ms or
more, the CAN box unit determines that a problem
has occurred.

.

TROUBLESHOOTING HINTS

• Malfunction of CAN bus line may be defective.

• Malfunction of the KOS-ECU may be defective.

<vehicles with KOS>

• Malfunction of the WCM may be defective. <vehi-

cles with WCM>

• Malfunction of 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)