Mitsubishi Lancer (4A9 engine). Manual - part 157

 

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Mitsubishi Lancer (4A9 engine). Manual - part 157

 

 

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-290

STANDARD FLOW OF DIAGNOSTIC 
TROUBLESHOOTING

M1544004800528

Refer to GROUP 00 

− Contents of troubleshooting .

DIAGNOSIS FUNCTION

M1544013200267

HOW TO READ DIAGNOSIS CODE

GROUP 00 

− Diagnosis function .

HOW TO ERASE DIAGNOSIS CODE

GROUP 00 

− Diagnosis function .

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using 
M.U.T.-III.
When detecting fault and storing the diagnosis code, 
the ECU connected to CAN bus line obtains the data 
before the determination of the diagnosis code and 
the data when the diagnosis code is determined, and 
then stores the ECU status of that time. By analysing 
each data from M.U.T.-III, the troubleshooting can be 
performed more efficiently. The displayed items are 
as the table below.

i CONNECT

 

i RETRY

iPod cannot be 
authenticated.

iPod is not authenticated. Reconnect. If the error code is not 
erased after that, the USB box communication may have a 
problem. Carry out the troubleshooting of "The USB adapter 
data cannot be replayed". (Refer to  <Vehicles without Auto 
Stop & Go (AS&G) System> or  <Vehicles with Auto Stop & Go 
(AS&G) System>.)

U NO SONG No playable music file is 

found.

No playable music file is stored in the USB memory. Store 
music files to the USB memory.

U FILE 
ERROR

Playback of unplayable file 
(copyright protected file, 
etc.) is attempted.

Displayed when the playback of unplayable file such as a 
copyright protected file is attempted. The error code is 
displayed approximately for 3 seconds, and then a next 
playable file is played automatically.

UNSUPPOR
TED DEVICE

Unsupported device

The USB memory is not supported by the USB box. Use the 
supported USB memory.

UNSUPPOR
TED 
FORMAT

Unsupported format

USB BUS 
PWR

Overcurrent abnormality

There is a communication error with the USB box. Carry out the 
troubleshooting of "The USB adapter data cannot be replayed". 
(Refer to  <Vehicles without Auto Stop & Go (AS&G) System> 
or  <Vehicles with Auto Stop & Go (AS&G) System>.)

U CONNECT 

 

U RETRY

USB memory cannot be 
authenticated.

The USB memory is not authenticated. Reconnect. If the error 
code is not erased after that, the USB box communication may 
have a problem. Carry out the troubleshooting of "The USB 
adapter data cannot be replayed". (Refer to  <Vehicles without 
Auto Stop & Go (AS&G) System> or  <Vehicles with Auto Stop 
& Go (AS&G) System>.)

U LSI 
ERROR

USB box internal error

This error code will be shown when there is a problem in the 
USB box. Replace the USB box.

Error code

Cause

Cause of trouble and its solution

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-291

Display item list

DIAGNOSIS CODE CHART

M1544012900478

CAUTION

On troubleshooting, if the ignition switch is 
turned ON while disconnecting connector(s), 
diagnosis code(s) associated with other system 
may be set. On completion, confirm all systems 
for diagnosis code(s). If diagnosis code(s) are 
set, erase them all.

DIAGNOSIS CODE PROCEDURES

Code No.U0019 Bus off (CAN-B)

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnosis code may be set. Prior 
to this diagnosis, always diagnose the CAN 
bus lines.

• Before replacing the radio and CD player, be 

sure to check that the power supply circuit, 

earth circuit, and communication circuit are 
normal.

TROUBLE JUDGMENT
When the radio and CD player is returned from the 
bus off state, or when the bus error is indicated to the 
radio and CD player state, the diagnosis code U0019 
(CAN-B) is set.

Item No.

Item name

Data item

Unit

1

Odometer

Total driving distance after the diagnosis code is 
generated

km

2

Ignition cycle

Number of times the ignition switch is turned "ON" or 
"LOCK (OFF)" after the past failure transition

Number of 
counts is 
displayed.

4

Accumulated minute Cumulative time for current malfunction of diagnosis 

code

min

Diagnosis 
code No.

Diagnostic item

Reference page

U0019

Bus off (CAN-B)

U0141

ETACS-ECU CAN timeout

U0151

SRS-ABG CAN timeout

U0155

Meter CAN timeout

U0164

A/C-ECU CAN timeout

U0168

WCM/KOS CAN timeout

U1415

Coding not completed/Data fail

B2420

Power integrated circuit

B2421

Radio tuner

B2423

6-disc CD player error

B2424

CD player error

B2450

Switch panel communication

B2451

Audio panel type error

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-292

COMMENTS ON TROUBLE SYMPTOM
The radio and CD player, power supply for the radio 
and CD player, earth circuit, or CAN bus line may 
have a problem.

PROBABLE CAUSES

• Malfunctions of radio and CD player

• Malfunction of CAN bus line wiring harness and 

connector

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. Check whether the M.U.T.-III can 
communicate with the radio and CD player.

Q: Is the check result normal?

YES : 

 Erase the diagnosis code. This diagnosis is 

complete.

NO : 

Check the power supply circuit of the radio 
and CD player, and repair if necessary.

Code No.U0141 ETACS-ECU CAN timeout

CAUTION

• If the diagnosis code No. U0141 is set, be sure 

to diagnose the CAN bus line.

• When replacing the radio and CD player, 

always check that the communication circuit 
is normal.

DIAGNOSTIC FUNCTION
If the signal from ETACS-ECU cannot be received, 
the radio and CD player sets the diagnosis code No. 
U0141.

JUDGMENT CRITERIA
With the statuses that the ignition switch is at ON 
position, system voltage is 10 

− 16 V (data from 

ETACS-ECU), and there is no malfunction to the 
power supply fuse (IOD fuse), or odometer value is 
80.5 km or more, if the communication with ETACS-
ECU cannot be established for 2,500 ms or more, 
the radio and CD player determines that a problem 
has occurred.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of radio and CD player

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the 
ETACS-ECU.

Q: Is the diagnosis code set?

YES : 

Diagnose the ETACS-ECU (Refer to 

GROUP 54A 

− ETACS-ECU − 

Troubleshooting ).

NO : 

Go to Step 3.

STEP 3. Check the M.U.T.-III Diagnosis code for 
other systems
Check if the diagnosis code No. U0141 is set to com-
bination meter.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the radio 
and CD player.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF) 

position to the ON position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-293

YES : 

Replace the ETACS-ECU.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the radio and CD player and the 
ETACS-ECU. (Refer to GROUP 00 

− How 

to Use Troubleshooting/Inspection Service 
Points - How to Cope with Intermittent 
Malfunction .)

STEP 5. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the radio 
and CD player.
(1) Erase the diagnosis code.

(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the radio and CD player.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the radio and CD player and the 
ETACS-ECU. (Refer to GROUP 00 

− How 

to Use Troubleshooting/Inspection Service 
Points - How to Cope with Intermittent 
Malfunction .)

Code No.U0151 SRS-ABG CAN timeout

CAUTION

• If the diagnosis code No. U0151 is set, be sure 

to diagnose the CAN bus line.

• When replacing the radio and CD player, 

always check that the communication circuit 
is normal.

DIAGNOSTIC FUNCTION
If the signal from SRS-ECU cannot be received, the 
radio and CD player sets the diagnosis code No. 
U0151.

JUDGMENT CRITERIA
With the statuses that the ignition switch is at ON 
position, system voltage is 10

−16 V (data from 

ETACS-ECU), and there is no malfunction to the 
power supply fuse (IOD fuse), or odometer value is 
80.5 km or more, if the communication with SRS-
ECU cannot be established for 2,500 ms or more, 
the radio and CD player determines that a problem 
has occurred.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the SRS-ECU

• Malfunction of radio and CD player

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the SRS-
ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the SRS-ECU (Refer to 

GROUP 52B 

− Troubleshooting ).

NO : 

Go to Step 3.

STEP 3. Check the M.U.T.-III Diagnosis code for 
other systems
Check if the diagnosis code No. U0151 is set to com-
bination meter.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the radio 
and CD player.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF) 

position to the ON position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the SRS-ECU.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the radio and CD player and the 
SRS-ECU. (Refer to GROUP 00 

− How to 

Use Troubleshooting/Inspection Service 
Points - How to Cope with Intermittent 
Malfunction .)

 

 

 

 

 

 

 

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