Mitsubishi Lancer (4A9 engine). Manual — part 216

ETACS

CHASSIS ELECTRICAL

54A-526

PROBABLE CAUSES

• Malfunction of the SRS-ECU

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

Q: Is the diagnosis code set?

YES :

Troubleshoot the SRS air bag (Refer to

GROUP 52B

− Troubleshooting ).

NO :

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0151 is set to the
KOS-ECU, WCM, radio and CD player, combination
meter, or A/C-ECU.

Q: Is the diagnosis code set?

YES :

Go to Step 4.

NO :

Go to Step 5.

STEP 4. 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 SRS-ECU.

NO :

The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the SRS-ECU and the ETACS-ECU
(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
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 trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the SRS-ECU and the ETACS-ECU
(GROUP 00

− How to use Troubleshooting/

inspection Service Points

− How to Cope

with Intermittent Malfunction ).

Code No.U0155 Meter CAN timeout

CAUTION

• If the diagnosis code No. U0155 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 combination meter cannot be
received, the ETACS-ECU sets the diagnosis code
No. U0155.

JUDGMENT CRITERIA
After the following statuses continue to be true for 5
seconds, if the communication with the combination
meter cannot be established for 2,500 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.

ETACS

CHASSIS ELECTRICAL

54A-527

PROBABLE CAUSES

• Malfunction of combination meter

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

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 combination
meter.

Q: Is the diagnosis code set?

YES :

Troubleshoot the combination meter. Refer

to .

NO :

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0155 is set to the
KOS-ECU, WCM, radio and CD player, SRS-ECU, or
A/C-ECU.

Q: Is the diagnosis code set?

YES :

Go to Step 4.

NO :

Go to Step 5.

STEP 4. 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 combination meter.

NO :

The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the combination meter 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
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 trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the combination meter and the ETACS-ECU
(Refer to GROUP 00

− How to use

Troubleshooting/inspection Service Points

−

How to Cope with Intermittent Malfunction ).

Code No.U0164 A/C/Heater control unit CAN timeout

CAUTION

• If the diagnosis code No. U0164 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 A/C-ECU cannot be received, the
ETACS-ECU sets the diagnosis code No. U0164.

JUDGMENT CRITERIA
After the following statuses continue to be true for 5
seconds, if the communication with the A/C-ECU
cannot be established for 2,500 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.

ETACS

CHASSIS ELECTRICAL

54A-528

PROBABLE CAUSES

• Malfunction of the A/C-ECU

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

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 ).

NO :

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0164 is set to the
KOS-ECU, WCM, radio and CD player, combination
meter, or SRS-ECU.

Q: Is the diagnosis code set?

YES :

Go to Step 4.

NO :

Go to Step 5.

STEP 4. 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 A/C-ECU.

NO :

The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the A/C-ECU 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
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 trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the A/C-ECU and the ETACS-ECU (Refer to
GROUP 00

− How to use Troubleshooting/

inspection Service Points

− How to Cope

with Intermittent Malfunction ).

Code No.U0168 KOS/WCM CAN timeout

CAUTION

• If the diagnosis code No. U0168 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 KOS-ECU or WCM cannot be
received, the ETACS-ECU sets the diagnosis code
No. U0168.

JUDGMENT CRITERIA
After the following statuses continue to be true for 5
seconds, if the communication with the KOS-ECU or
WCM cannot be established for 2,500 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.

ETACS

CHASSIS ELECTRICAL

54A-529

PROBABLE CAUSES

• Malfunction of the KOS-ECU

• Malfunction of the WCM

• 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. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the KOS-ECU or
WCM.

Q: Is the diagnosis code set to the any of the above?

Set to the KOS-ECU. :

Troubleshoot the KOS.

Refer to GROUP 42B

− Diagnosis Code

Chart .

Set to the WCM. :

Troubleshoot the WCM. Refer to

GROUP 42C

− Diagnosis Code Chart .

The diagnosis code is not set. :

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0168 is set to the
SRS-ECU, radio and CD player, combination meter,
or A/C-ECU.

Q: Is the diagnosis code set?

YES :

Go to Step 4.

NO :

Go to Step 5.

STEP 4. 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 KOS-ECU or WCM.

NO :

The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the KOS-ECU or WCM 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
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 trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the KOS-ECU or WCM and the ETACS-
ECU (Refer to GROUP 00

− How to use

Troubleshooting/inspection Service Points

−

How to Cope with Intermittent Malfunction ).

Code No.U0181 Headlamp automatic levelling-ECU CAN timeout

CAUTION

• If diagnosis code No. U0181 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 headlamp automatic levelling-ECU
cannot be received, the ETACS-ECU sets the diag-
nosis code No. U0181.

JUDGMENT CRITERIA
After the following statuses continue to be true for 5
seconds, if the communication with the headlamp
automatic levelling-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.