Mitsubishi Lancer Evolution IX. Manual — part 169

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-239

INPUT SIGNAL PROCEDURES

INSPECTION PROCEDURE L-1: The ignition switch (ACC) signal is not received.

CAUTION

Whenever the ECU is replaced, ensure that the
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the ignition switch (ACC) is used to
operate the functions below. If the signal is abnormal,
these functions will not work normally.

• Windshield wiper and washer

• Interior lamp automatic shutdown function

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

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

ETACS-ECU

IGNITION
SWITCH (ACC)

J/B SIDE

Ignition Switch (ACC) Input Circuit

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-240

DIAGNOSTIC PROCEDURE

Step 1. Connector check: C-226 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-226
ETACS-ECU connector

(1) Remove the ETACS-ECU, and measure at the

junction block side.

(2) Ignition switch: ACC position

(3) Voltage between C-226 ETACS-ECU connector

terminal No.18 and body earth

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 3.

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side

AC301541GT

Connector C-226
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-241

Step 3. Check the wiring harness between C-226
ETACS-ECU connector terminal No.18 and the
ignition switch (ACC).

NOTE:

Prior to the wiring harness inspection, check junction
block connector C-211, and repair if necessary.

• 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

Cope with Intermittent Malfunction

P.00-5

).

NO :

Repair the wiring harness.

Step 4. Retest the system.
Check that the ignition switch (ACC) signal is
received normally.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

Cope with Intermittent Malfunction

P.00-5

).

NO :

Replace the ETACS-ECU.

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side

AC310448

Harness side

Junction block (front view)

Connector: C-211

AB

<LHD>

4

6 5

3

2

1

AC310458

Harness side

Junction block (front view)

Connector: C-211

AB

<RHD>

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-242

INSPECTION PROCEDURE L-2: The ignition switch (IG1) signal is not received.

CAUTION

Whenever the ECU is replaced, ensure that the
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the ignition switch (IG1) is used to
operate the functions below. If the signal is abnormal,
these functions will not work normally.

• Lamp reminder function

• Ignition key cylinder illumination lamp

• Headlamp automatic shutdown function

• Turn signal lamp

• Room lamps

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Connector check: C-226 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the defective connector.

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

ETACS-ECU

IGNITION
SWITCH (IG1)

J/B SIDE

Ignition Switch (IG1) Input Circuit

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side