Mitsubishi Colt Ralliart. Manual — part 324

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-40

SYMPTOM PROCEDURES

Inspection Procedure A-1: Communication with the M.U.T.-III is not possible.

CAUTION

Whenever the ECU is replaced, ensure that the
power supply circuit, the earth circuit and the
communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM

It is suspected that the power supply circuit to the
ETACS-ECU is defective, or the wiring harness
between the diagnosis connector and the
ETACS-ECU or their connector(s) is damaged.
NOTE: If the wiring harness between the
ETACS-ECU and body earth is defective, also check
B-134 ETACS-ECU connector terminal No.2, and
repair if necessary.

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check that the M.U.T.-III communicates
with the other systems.
Use the M.U.T.-III to confirm that it communicates
with the engine-ECU.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Diagnose the system, which cannot
communicate with the M.U.T.-III.

ETACS-
ECU

J/B SIDE

DIAGNOSIS
CONNECTOR

FRONT 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 : Gray R : Red P : Pink V : Violet

MUT-III Communication and ETACS-ECS Circuit

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-41

Step 2. Check that the M.U.T.-III can communicate
with the system.
When the ignition switch is turned ON, check if the
M.U.T.-III can communicate with the system.

Q: Is the check result normal?

YES :

Refer to Inspection Procedure A-2 "When

the ignition switch is at the LOCK (OFF)
position, the functions do not work normally.
Check the battery power supply circuit to
the ETACS-ECU

P.54B-43

."

NO :

Go to Step 3.

Step 3. Connector check: B-133 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the defective connector.

Step 4. Resistance measurement at the B-133
ETACS-ECU connector.

(1) Disconnect the connector, and measure at the

junction block side.

(2) Resistance between B-133 ETACS-ECU

connector terminal No.70 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-133
ETACS-ECU connector terminal No.70 and body
earth.

• Check the earth wires 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

P.00-13

).

NO :

Repair the wiring harness.

AC313826 AB

Connector: B-133

Harness side

B-133 (GR)

AC313826 AB

Connector: B-133

Harness side

B-133 (GR)

AC310506

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

AC310506EL

Connector B-133
(Harness side)

AC313826 AB

Connector: B-133

Harness side

B-133 (GR)

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-42

Step 6. Connector check: B-32 diagnosis
connector

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the defective connector.

Step 7. Check the wiring harness from B-133
ETACS-ECU connector terminal Nos. 52 and 69 to
B-32 diagnosis connector terminal Nos. 9 and 1.

• Check the communication lines for open circuit.

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the wiring harness.

Step 8. Check the wiring harness from B-133
ETACS-ECU connector terminal No.54 to B-32
diagnosis connector terminal No.3.

• 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. Retest the system.
Check whether the communication with the M.U.T.-III
is possible.

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.

AC401055

AF

Connector: B-32

B-32 (B)

Harness side

AC401055

AF

Connector: B-32

B-32 (B)

Harness side

AC313826 AB

Connector: B-133

Harness side

B-133 (GR)

AC401055

AF

Connector: B-32

B-32 (B)

Harness side

AC313826 AB

Connector: B-133

Harness side

B-133 (GR)

Main

Index

Group

TOC

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-43

Inspection Procedure A-2: When the ignition switch is at the LOCK (OFF) position, the functions do
not work normally. Check the battery power supply circuit to the ETACS-ECU.

CAUTION

Whenever the ECU is replaced, ensure that the
power supply circuit and the earth circuit are nor-
mal.

COMMENTS ON TROUBLE SYMPTOM

If this circuit is defective and the ignition switch is at
the LOCK (OFF) position, the ETACS-ECU does not
work. In this case, the functions below will be sus-
pended.

• Lamp reminder function

• Keyless entry system

• Ignition key cylinder illumination lamp

However, when the ignition switch is at the ON posi-
tion, the functions below will work.

• Reading diagnosis code and checking input sig-

nal by M.U.T.-III.

• Central door locking

• Headlamp and tail lamp

• Hazard warning lamp

• Interior lamps

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

ETACS-ECS Power Supply Circuit

1

FUSIBLE
LINK

ETACS-
ECU

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