Mitsubishi Colt Ralliart. Manual - part 383

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-40

Step 6. Check the wiring harness between B-135 
column switch connector No.4 to body earth.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector B-25, and repair if necessary.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the wiring harness.

Step 7. Connector check: B-133 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the defective connector.

Step 8. Check the wiring harness from B-133 
ETACS-ECU connector terminal Nos. 54, 60 and 
63 to B-135 column switch connector terminal 
Nos. 3, 10 and 2.

• Check the communication lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

Step 9. ECU check by using the SWS monitor

• Ignition switch: OFF

ECU TO BE CHECKED

• COLUMN ECU

OK: "OK" is displayed on the "COLUMN 
ECU" menu.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Replace the column switch.

Step 10. Retest the system.
Check that the ETACS-ECU communicates with the 
column switch.

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 

P.00-13

).

NO : 

Replace the ETACS-ECU.

AC401044AC

Connector: B-135

Harness side

AC401055

Connector: B-25

AG

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

AC401044AC

Connector: B-135

Harness side

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-41

INSPECTION PROCEDURE A-3: Communication with the ETACS-ECU is not possible.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

ETACS-ECU Power Supply and SWS Communication Circuit

FUSIBLE 
LINK

IGNITION 
SWITCH (IG1)

POWER 
SOURCE

ETACS-
ECU

COLUMN-ECU

COLUMN 
SWITCH

DIAGNOSIS 
CONNECTOR

FRONT SIDE

1

J/B SIDE

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

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-42

COMMENTS ON TROUBLE SYMPTOM

It is suspected that the power supply circuit to the 
ETACS-ECU is defective, or the wiring harness 
between the SWS monitor and the ETACS-ECU or 
their connector(s) is damaged. If the battery power 
supply circuit to the ECU (terminal No.20 of the 
ETACS-ECU) is damaged, also check the power 
supply circuit from the ignition switch (IG1) (terminal 
No.8 of the ETACS-ECU), and repair if necessary. If 
the earth circuit to the ECU (terminal No.2 of the 
ETACS-ECU) is defective, also check the earth cir-
cuit to the sensor (terminal No.70 of the 
ETACS-ECU), and repair if necessary.

TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Connector check: B-134 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 B-134 
ETACS-ECU connector.

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

junction block side.

(2) Voltage between B-134 ETACS-ECU connector 

terminal No.20 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

Step 3. Check the wiring harness between B-134 
ETACS-ECU connector terminal No.20 to fusible 
link (1).

NOTE: 

Prior to the wiring harness inspection, check junction 
block connector B-108, and repair if necessary.

• Check the power supply line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

AC313826

Connector: B-134

AG

Junction block side

Junction block (Rear view)

AC313826

Connector: B-134

AG

Junction block side

Junction block (Rear view)

AC310507FC

Connector B-134 
(Junction block side)

AC313826

Connector: B-134

AG

Junction block side

Junction block (Rear view)

AC313870

Connector: B-108

BD

Junction block (Front view)

B-108(B)

Harness side

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-43

Step 4. Resistance measurement at the B-134 
ETACS-ECU connector.

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

junction block side.

(2) Resistance between B-134 ETACS-ECU 

connector terminal No.2 and body earth

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

Step 5. Check the wiring harness between B-134 
ETACS-ECU connector terminal No.2 to body 
earth.

NOTE: Prior to the wiring harness inspection, check 
junction block connector B-130, and repair if neces-
sary.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

AC313826

Connector: B-134

AG

Junction block side

Junction block (Rear view)

AC310506DY

Connector B-134 
(Junction block side)

AC313827

Connectors: B-130, B-134

AD

Junction block side

Junction block (Rear view)

B-134

B-130

B-134

Harness side

B-130

Main

Index

Group

TOC