Mitsubishi Lancer (4A9 engine). Manual - part 218

 

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Mitsubishi Lancer (4A9 engine). Manual - part 218

 

 

ETACS

CHASSIS ELECTRICAL

54A-534

Code No. U1005 Corner sensor/back sensor-ECU CAN timeout

CAUTION

• If diagnosis code No. U1005 is set to the 

ETACS-ECU, always diagnose the CAN bus 
line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

DIAGNOSTIC FUNCTION
If the signal from corner sensor/back sensor-ECU 
cannot be received, the ETACS-ECU sets the diag-
nosis code No. U1005.

JUDGEMENT CRITERIA
After the following statuses continue to be true for 5 
seconds, if the communication with the corner sen-
sor/back sensor-ECU cannot be established for 600 
ms or more, the ETACS-ECU determines that a 
problem has occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse (IOD fuse), or the odometer value is at 80.5 
km or more.

• ETACS-ECU system voltage is at 10−16 V.

PROBABLE CAUSES

• Malfunction of the corner sensor/back sensor-

ECU

• Malfunction of the ETACS-ECU

• Malfunction of the CAN bus

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use 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 lines. (Refer to GROUP 
54C 

− Troubleshooting .)

STEP 2. Check the M.U.T.-III Diagnosis code for 
other systems
Check if a diagnosis code is set to the corner sensor/
back sensor-ECU.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting for the corner 

sensor/back sensor-ECU. (Refer to .)

NO : 

Go to Step 3.

STEP 3. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to ETACS-
ECU.
(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 corner sensor/back sensor-

ECU. Go to Step 4.

NO : 

A poor connection, open circuit, or other 
intermittent malfunction in the CAN bus line 
between the corner sensor/back sensor-
ECU and ETACS-ECU. (Refer to GROUP 
00 

− How to Use Troubleshooting/

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

STEP 4. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to ETACS-
ECU.
(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 ETACS-ECU.

NO : 

A poor connection, open circuit, or other 
intermittent malfunction in the CAN bus line 
between the corner sensor/back sensor-
ECU and ETACS-ECU. (Refer to GROUP 
00 

− How to Use Troubleshooting/

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

ETACS

CHASSIS ELECTRICAL

54A-535

Code No.U1108 Additional CAN-B ECU detected

CAUTION

If the diagnosis code No. U1108 is set to the 
ETACS-ECU, always diagnose the CAN bus line.
JUDGMENT CRITERIA
If the ETACS-ECU receives the signal from the CAN-
B line ECU which does not exist in the written variant 
code information, the ETACS-ECU sets the diagno-
sis code No. U1108.

PROBABLE CAUSES

• Malfunction of the ETACS-ECU

• Malfunction of the CAN bus

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. Variant code check
Check the variant code written to the ETACS-ECU, 
and check whether it matches the ECU connected to 
the CAN-B line.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Make a correction so that the ECU 
connected to the CAN-B line matches with 
the variant code information, and then go to 
Step 3.

STEP 3. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(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 ETACS-ECU.

NO : 

This diagnosis is complete.

Code No.U1120 Bus line (CAN-C) low input

 

Code No.U1121 Bus line (CAN-C) high input

JUDGMENT CRITERIA
When the CAN bus line voltage is in the following 
states, the ETACS-ECU set the diagnosis code.

• If the CAN bus line voltage is 0.3 V or less, the 

diagnosis code No. U1120 is set.

• If the CAN bus line voltage is 4.7 V or more, the 

diagnosis code No. U1121 is set.

PROBABLE CAUSES

• Malfunction of CAN bus line

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 diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(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 ETACS-ECU.

NO : 

The diagnosis is complete.

ETACS

CHASSIS ELECTRICAL

54A-536

Code No.B1761 Chassis No. not programmed

JUDGMENT CRITERIA
If the chassis number is not written to the ETACS-
ECU, the ETACS-ECU sets diagnosis code No. 
B1761.

PROBABLE CAUSES

• Chassis No. not programmed

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.
(1) Write the chassis number to the ETACS-ECU.
(2) Erase the diagnosis code.
(3) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(4) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace with the coded ETACS-ECU.

NO : 

The diagnosis is complete.

Code No.B210A +B power supply (low input)

 

Code No.B210B +B power supply (high input)

CAUTION

Before replacing the ECU, ensure that the input and output signal circuits are normal.

ETACS-ECU Power Source Circuit

ETACS-ECU

FUSIBLE 
LINK

36

38

NOTE

PETROL

:

DIESEL

:

RELAY BOX

ENGINE 
COMPARTMENT

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

ETACS

CHASSIS ELECTRICAL

54A-537

TROUBLE JUDGEMENT
The ETACS-ECU sets the code No. B210A if the 
power supply fuse voltage decreases to the specified 
value or less, and sets the code No. B210B if the 
power supply fuse voltage increases to the specified 
value or more. However, when the status returns to 
normal, the ETACS-ECU automatically erases the 
code Nos. B210A and B210B.

COMMENTS ON TROUBLE SYMPTOM
The power supply fuse or the ETACS-ECU may have 
a problem.

PROBABLE CAUSES

• Malfunction of power supply fuse

• Malfunction of the ETACS-ECU

• Malfunction of battery

• Malfunction of alternator

• Malfunction of harness

DIAGNOSIS PROCEDURE

STEP 1. Power supply fuse check

Q: Is the fuse in good condition?

YES : 

Go to Step 2.

NO : 

Replace the power supply fuse, and then go 
to Step 8.

STEP 2. Battery check
Refer to GROUP 54A 

− Battery Test .

Q: Is the battery in good condition?

YES : 

Go to Step 3.

NO : 

Charge or replace the battery.

STEP 3. Charging system check
Refer to GROUP 16 

− Charging System  <except 

1800-Diesel> or  <1800-Diesel>.

Q: Is the charging system in good condition?

YES : 

Go to Step 4.

NO : 

Repair or replace the charging system 
component(s).

STEP 4. Connector check: C-307 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Voltage measurement at the C-307 
ETACS-ECU connector.
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the voltage between the C-307 ETACS-

ECU connector terminal No. 2 and the body 
earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

STEP 6. Wiring harness check between the C-307 
ETACS-ECU connector terminal No. 2 and the 
fusible link (36) <except 1800-DIESEL> or (38) 
<1800-DIESEL>.
Check the power supply line for open circuit.

Q: Is the check result 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 ).

NO : 

Repair the wiring harness.

AC701240

AY

Connector: C-307 <LHD>

C-307 (B)

ETACS-ECU

AC701241

BE

Connector: C-307 <RHD>

C-307 (B)

ETACS-ECU

 

 

 

 

 

 

 

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