Mitsubishi Lancer (4A9 engine). Manual — part 222

ETACS

CHASSIS ELECTRICAL

54A-550

ECU connector terminal No. 1 and the body
earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Go to Step 8.

STEP 8. Wiring harness check between the C-309
ETACS-ECU connector terminal No. 1 and the
fusible link (34) <except 1800-Diesel> or (44)
<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.

STEP 9. Retest the system
Check that the ETACS-ECU functions work normally.

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 :

Replace the ETACS-ECU.

TROUBLE SYMPTOM CHART FOR INPUT
SIGNAL

M1545004900540

Trouble symptom

Inspection
Procedure No.

Reference
page

The ignition switch (ACC) signal is not received.

1

The ignition switch (IG1) signal is not received.

2

The key reminder switch signal is not received.

3

The front door lock actuator signal is not
received.

LH drive vehicles

4

RH drive vehicles

The front door switch (driver’s side) signal is not received.

5

The front door switch (passenger’s side) signal is not received.

6

The rear door switch (RH) signal is not received.

7

The rear door switch (LH) signal is not received.

8

The trunk lid latch signal is not received.

LANCER

9

The tailgate switch signal is not received.

LANCER SPORTBACK

The hazard warning lamp switch signal is not received.

10

The column switch signal is not received.

11

The hood latch switch signal is not received.

12

The stop lamp switch signal is not received.

13

ETACS

CHASSIS ELECTRICAL

54A-551

INPUT SIGNAL PROCEDURES

Inspection Procedure 1: The ignition switch (ACC) signal is not received.

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
If there is an error to the ignition switch (ACC) input
signal, or the ACC relay inside the ETACS-ECU does
not operate, the ignition switch (ACC) signal is no
longer output to the communication line.

PROBABLE CAUSES

• Malfunction of the ETACS-ECU

• Malfunction of the ignition switch

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-317 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the defective connector.

STEP 2. Voltage measurement at the C-317
ETACS-ECU connector.
(1) Measure by backprobing without disconnecting

the connector.

(2) Turn the ignition switch to the "ACC" position.
(3) Measure the voltage between the C-317 ETACS-

ECU connector terminal No. 7 and the body
earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 3.

Ignition Switch (ACC) Input Circuit

ETACS-ECU

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

IGNITION
SWITCH (ACC)

AC701240

AO

Connector: C-317 <LHD>

ETACS-ECU

AC701241

AC

Connector: C-317 <RHD>

ETACS-ECU

ETACS

CHASSIS ELECTRICAL

54A-552

STEP 3. Wiring harness check between the C-317
ETACS-ECU connector terminal No. 7 and the
ignition switch (ACC)

• Check the power supply (ACC) line for open cir-

cuit and short circuit.

Q: Is the check result normal?

YES :

Troubleshoot the ignition switch. Refer to

Inspection Procedure 2 "Malfunction of the
ignition switch power supply system."

NO :

Repair the wiring harness.

STEP 4. M.U.T.-III data list

• Turn the ignition switch to the ACC position.

OK: Normal condition is displayed.

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 :

Replace the ETACS-ECU.

Inspection Procedure 2: The ignition switch (IG1) signal is not received.

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.

Item No.

Item name

Normal
condition

Item 288

ACC switch

ON

Ignition Switch (IG1) Input Circuit

ETACS-ECU

IGNITION
SWITCH (IG1)

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

AC701240

AO

Connector: C-317 <LHD>

ETACS-ECU

AC701241

AC

Connector: C-317 <RHD>

ETACS-ECU

ETACS

CHASSIS ELECTRICAL

54A-553

COMMENTS ON TROUBLE SYMPTOM
If there is an error to the ignition switch (IG1) input
signal, or the IG relay inside the ETACS-ECU does
not operate, the ignition switch (IG1) signal is no
longer output to the communication line.

PROBABLE CAUSES

• Malfunction of the ignition switch

• Malfunction of the ETACS-ECU

• Malfunction of fuse

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-317 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the defective connector.

STEP 2. Voltage measurement at the C-317
ETACS-ECU connector.
(1) Measure by backprobing without disconnecting

the connector.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the C-317 ETACS-

ECU connector terminal No. 6 and the body
earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 3.

STEP 3. Wiring harness check between the C-317
ETACS-ECU connector terminal No. 6 and the
ignition switch (IG1)
Check the power supply (IG1) line for open circuit
and short circuit.

Q: Is the check result normal?

YES :

Troubleshoot the ignition switch. Refer to

Inspection Procedure 2 "Malfunction of the
ignition switch power supply system."

NO :

Repair the wiring harness.

STEP 4. M.U.T.-III data list
Turn the ignition switch to the ON position.

OK: Normal condition is displayed.

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 :

Replace the ETACS-ECU.

Item No.

Item name

Normal
condition

Item 254

IG voltage

System voltage