Mitsubishi Lancer Evolution IX. Manual - part 115

 

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Mitsubishi Lancer Evolution IX. Manual - part 115

 

 

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-23

DIAGNOSIS CODE SET CONDITIONS

If the front-ECU has sent abnormal signal to the 
ETACS-ECU for consecutively 15 communication 
cycles (0.6 second), the diagnosis code will be set. If 
the front-ECU has sent normal signal to the 
ETACS-ECU for consecutively 15 communication 
cycles (0.6 second), the ETACS-ECU will stop send-
ing the diagnosis code.

POSSIBLE CAUSES

• Malfunction of the front-ECU

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. M.U.T.-II/III diagnosis code.
(1) Ignition switch: ON
(2) On completion, check that diagnosis code No.13 

is not reset.

Q: Is diagnosis code No.13 set?

YES : 

Go to Step 5.

NO : 

Go to Step 2.

Step 2. Connector check: A-10X front-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

Step 3. Voltage measurement at A-10X front-ECU 
connector

(1) Remove the front-ECU, and measure at the relay 

box side.

(2) Voltage between A-10X front-ECU connector 

terminal No.7 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Replace the front-ECU.

NO : 

Go to Step 4.

Step 4. Check the wiring harness between A-10X 
front-ECU connector terminal No.7 and the 
battery.

• 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.

AC310572AB

Connector: A-10X

Relay box side

10

11

5

9 8 7 6

4 3

1

2

Battery

AC310572AB

Connector: A-10X

Relay box side

10

11

5

9 8 7 6

4 3

1

2

Battery

AC301541CT

5

11

9

10

8 7 6

2

4 3

1

Connector A-10X
(Relay box side)

AC310572AB

Connector: A-10X

Relay box side

10

11

5

9 8 7 6

4 3

1

2

Battery

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-24

Step 5. Connector check: A-11X front-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

Step 6. Resistance measurement at A-11X 
front-ECU connector

(1) Remove the front-ECU, and measure at the relay 

box side.

(2) Resistance between A-11X front-ECU connector 

terminal No.31 and body earth

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 7.

Step 7. Check the wiring harness between A-11X 
front-ECU connector terminal No.31 and the 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 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Repair the wiring harness.

Step 8. Connector check: C-228 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the defective connector.

AC310572AC

Connector: A-11X

Relay box side

Battery

29

31 30

28 27

25

26

24

21

22

23

AC310572AC

Connector: A-11X

Relay box side

Battery

29

31 30

28 27

25

26

24

21

22

23

AC301541CU

Connector A-11X
(Relay box side)

24

29

30

31

2827

25

26

21

2322

AC310572AC

Connector: A-11X

Relay box side

Battery

29

31 30

28 27

25

26

24

21

22

23

AC310450

Connector: C-228 <LHD>

AC

Junction block (rear view)

C-228 (GR)

Harness side

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

AC310461

Junction block (rear view)

Connector: C-228 <RHD>

AC

Harness side

C-228 (GR)

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-25

Step 9. Check the wiring harness between C-228 
ETACS-ECU connector terminal No.59 and A-11X 
front-ECU connector terminal No.22.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-101 and intermediate connector C-129, 
and repair if necessary.

• Check the communication lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the wiring harness.

AC310572AC

Connector: A-11X

Relay box side

Battery

29

31 30

28 27

25

26

24

21

22

23

AC310450

Connector: C-228 <LHD>

AC

Junction block (rear view)

C-228 (GR)

Harness side

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

AC310461

Junction block (rear view)

Connector: C-228 <RHD>

AC

Harness side

C-228 (GR)

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

AC310446

Connector: C-101 <LHD>

AW

C-101 (L)

AC310456

Connector: C-101 <RHD>

AQ

C-101 (L)

AC310446

Connector: C-129 <LHD>

AS

AC310454

Connector: C-129 <RHD>

AV

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-26

Step 10. Check whether the diagnosis code is 
reset.
Replace the column switch, and then check that the 
diagnosis code is not reset.
(1) Replace the column switch.
(2) Ignition switch: ON

(3) On completion, check that diagnosis code No.13 

is not reset.

Q: Is diagnosis code No.13 set?

YES : 

Replace the ETACS-ECU.

NO : 

The procedure is complete.

Diagnosis code 21: Short circuit in SWS communication line

CAUTION

Whenever the ECU is replaced, ensure that the 
communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS

If the SWS communication line voltage is kept at low 
level for 0.3 second, the diagnosis code will be set. If 
the ETACS-ECU data line voltage is kept at high 
level for 0.3 second, or the ETACS-ECU has 
received normal signal from the other ECUs or 
switches, the ETACS-ECU will stop sending the 
diagnosis code. While this code is set, the other 
codes will not be set.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the front-ECU

• Malfunction of the power window main switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

NOTE

: LHD
: RHD

FRONT-ECU

ETACS-ECU

COLUMN
SWITCH

POWER
WINDOW
MAIN SWITCH

COLUMN-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 : Gray     R : Red     P : Pink     V : Violet

CPU

SWS Communication Line

 

 

 

 

 

 

 

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