Mitsubishi Lancer (4A9 engine). Manual - part 177

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-370

Code No.U0164 A/C-ECU CAN timeout

CAUTION

• If the diagnosis code No. U0164 is set, be sure 

to diagnose the CAN bus line.

• When replacing the CAN box unit, always 

check that the communication circuit is nor-
mal. (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 the diagnosis code No. U0164.

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

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the A/C-ECU

• Malfunction of CAN box unit

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 if diagnosis code is set to the A/C-ECU .

Q: Is the diagnosis code set?

YES : 

Troubleshoot the A/C-ECU (Refer to 

GROUP 55A 

− Troubleshooting ), and then 

go to Step 3.

NO : 

Go to Step 3.

STEP 3. Check the M.U.T.-III Diagnosis code for 
other systems
Check if the diagnosis code No. U0164 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 CAN 
box unit.
(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 A/C-ECU.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the CAN box unit and the A/C-
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 CAN 
box unit.
(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 CAN box unit.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the CAN box unit and the A/C-
ECU. (Refer to GROUP 00 

− How to Use 

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

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-371

Code No.U0168 WCM/KOS CAN timeout

CAUTION

• If diagnosis code No. U0168 is set, be sure to 

diagnose the CAN bus line.

• When replacing the CAN box unit, always 

check that the communication circuit is nor-
mal. (Check that the voltage is 10 V or more.)

DIAGNOSTIC FUNCTION
If the signal from KOS-ECU or WCM cannot be 
received, the CAN box unit sets the diagnosis code 
No. U0168.

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

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the KOS-ECU

• Malfunction of the WCM

• Malfunction of CAN box unit

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 KOS-
ECU or WCM.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the KOS or WCM (Refer to 

GROUP 42B 

− Diagnosis Code Chart  

<KOS> or GROUP 42C 

− Diagnosis Code 

Chart  <WCM>).

NO : 

Go to Step 3.

STEP 3. Check the M.U.T.-III Diagnosis code for 
other systems
Check if the diagnosis code No. U0168 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 CAN 
box unit.
(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 KOS <Vehicles with KOS-

ECU> or WCM <Vehicles with WCM>.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the CAN box unit and the KOS 
<Vehicles with KOS-ECU> or WCM 
<Vehicles with WCM>. (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 CAN 
box unit.
(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 CAN box unit.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the CAN box unit and the KOS 
<Vehicles with KOS-ECU> or WCM 
<Vehicles with WCM>. (Refer to GROUP 00 
− How to Use Troubleshooting/Inspection 
Service Points - How to Cope with 
Intermittent Malfunction .)

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-372

Code No.U1415 Coding not completed/Data fail

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 CAN box unit, be sure to 

check that the power supply circuit, earth cir-
cuit, and communication circuit are normal. 
(Check that the voltage is 10 V or more.)

TROUBLE JUDGEMENT
When the vehicle information data is not registered 
to the CAN box unit, the CAN box unit sets the diag-
nosis code No.U1415.

COMMENTS ON TROUBLE SYMPTOM
The can box unit, ETACS-ECU, or CAN bus line may 
have a problem.

PROBABLE CAUSES

• Malfunctions of CAN box unit

• Malfunction of the ETACS-ECU

• 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. M.U.T.-III other system diagnosis code
Check if the diagnosis code relating to the coding 
error is set to the ETACS-ECU.

Q: Is the diagnosis code set?

YES : 

Diagnose the ETACS-ECU (Refer to 

ETACS 

− Troubleshooting ).

NO : 

Go to Step 3.

STEP 3. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the CAN 
box unit.
(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 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 ).

Code No.U1417 Implausible coding data

CAUTION

• If diagnosis code U1417 is set in CAN box 

unit, always diagnose the CAN bus lines. If 
there is any fault in the CAN bus lines, an 
incorrect diagnosis code may be set. In this 
case, the set diagnosis code is not highly reli-
able.

• Before replacing the ECU, ensure that the 

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

• When the diagnosis code U1417 is set in CAN 

box unit, the diagnosis code may also be set 
in ETACS-ECU. When the diagnosis code is 
set in ETACS-ECU, carry out the diagnosis of 
the diagnosis code for ETACS-ECU first.

CIRCUIT OPERATION

CAN box unit receives the vehicle information stored 
in the ETACS-ECU via CAN bus lines.

JUDGEMENT CRITERIA
CAN box unit communicates with ETACS-ECU via 
CAN bus lines. This diagnosis code is set when the 
vehicle information received from the ETACS-ECU is 
invalid.

PROBABLE CAUSES

• Malfunction of ETACS-ECU

• Malfunction of the ETACS-ECUs have been inter-

changed between two vehicles.

• Malfunction of the CAN box unit

• External noise interference

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-373

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 if the diagnosis code relating to the coding 
error is set to the ETACS-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the ETACS (Refer to ETACS, 

Diagnosis ).

NO  : 

Go to Step 3.

STEP 3. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the CAN 
box unit.
(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 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 ).

TROUBLE SYMPTOM CHART

M1546001801830

Inspection 
procedure 
No.

Trouble symptom

Reference 
page

1

No navigation screen is displayed.

<Vehicles without Auto Stop & Go 
(AS&G) System>
<Vehicles with Auto Stop & Go 
(AS&G) System>

2

No sound is heard.

<Vehicles without audio amplifier>
<Vehicles with audio amplifier>

3

Not sound is heard from one of the 
speakers.

<Except vehicles for RUSSIA 
(vehicles without audio amplifier)>
<Vehicles for RUSSIA (vehicles 
without audio amplifier)>
<Except vehicles for RUSSIA 
(vehicles with audio amplifier)>
<Vehicles for RUSSIA (vehicles 
with audio amplifier)>

4

The navigation system can be operated while the vehicle is driven.

5

The screen is not normal in the navigation 
mode. (The own vehicle mark is dislocated.)

<Except vehicles for RUSSIA>
<Vehicles for RUSSIA>

6

The FM/MW/LM radio broadcasting can not be received.

7

GPS signal can not be received.

<Except vehicles for RUSSIA>
<Vehicles for RUSSIA>

8

CD/DVD cannot be Played.

9

Image of a DVD is played, but no sound is played.

10

Sound of a DVD can be played, but no image is played.

11

The picture and sound of audio and video adapter’s input are not played.

12

Check the CAN box unit power supply circuit. <Vehicles for RUSSIA>