Mitsubishi Evolution X. Manual - part 983

RADIO AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-293

DTC U0154: OCM CAN timeout

CAUTION

• If DTC U0154 is set, be sure to diagnose the 

CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

When the signals from occupant classification-ECU 
cannot be received, the radio and CD player sets 
DTC U0154.

.

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 occupant classification-ECU cannot be 
established for 2,500 ms or more, the radio and CD 
player determines that a problem has occurred.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective.

• The radio and CD player may be defective.

• The occupant classification-ECU may be defec-

tive.

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-537

."

(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

RADIO AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-294

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 radio and CD player.
(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 radio and CD player.
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.

.

DIAGNOSTIC FUNCTION

When the signals from combination meter cannot be 
received, the radio and CD player 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 occupant classification-ECU cannot be 
established for 2,500 ms or more, the radio and CD 
player determines that a problem has occurred.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective.

• The radio and CD player 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

RADIO AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-295

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-285

."

(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 radio and CD player.
(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 radio and CD player.
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

RADIO AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-296

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.

.

DIAGNOSTIC FUNCTION

If the signal from A/C-ECU cannot be received, the 
radio and CD player 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 radio and CD player deter-
mines that a problem has occurred.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective.

• The A/C-ECU may be defective.

• The radio and CD player 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-285

."

(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