Mitsubishi Grandis. Manual — part 11

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-41

COMMENTS ON TROUBLE SYMPTOM

The front-ECU, the ETACS-ECU, connector(s), or
wiring harness between the two may be defective.

POSSIBLE CAUSES

• Malfunction of the front-ECU

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. MUT-III CAN bus diagnostics

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus line (Refer to GROUP
54D

− Diagnosis

P.54D-16

).

Step 2. MUT-III diagnosis code
(1) Ignition switch: ON
(2) On completion, check that diagnosis code No.03

is not reset.

Q: Is diagnosis code No.03 set?

YES :

Go to Step 6.

NO :

Go to Step 3.

Step 3. Connector check: A-14X front-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the defective connector.

Step 4. Voltage measurement at A-14X front-ECU
connector.

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

box side.

(2) Voltage between A-14X 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 5.

Step 5. Check the wiring harness between A-14X
front-ECU connector terminal No.7 and the
fusible link (26).

• 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.

AC311521AB

Connector: A-14X

Relay box side

AC311521AB

Connector: A-14X

Relay box side

AC301541

AC301541IF

Connector A-11X
(Relay box side)

AC311521AB

Connector: A-14X

Relay box side

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-42

Step 6. Connector check: A-15X front-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the defective connector.

Step 7. Resistance measurement at A-15X
front-ECU connector.

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

box side.

(2) Resistance between A-15X front-ECU connector

terminal No.31 and body earth

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Go to Step 8.

Step 8. Connector check: A-25 earth connector

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the defective connector.

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC301541

21

22

23

24

25

26

27

28

29

30

31

AC301541IG

Connector A-15X
(Relay box side)

AC310403

A-25 (GR)

AE

Connector: A-25 <LHD>

Harness side

AC310398

A-25 (GR)

AE

Connector: A-25 <RHD>

Harness side

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-43

Step 9. Check the wiring harness between A-15X
front-ECU connector terminal No.31 and the A-25
earth connector terminal No.5.

• 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 10. Connector check: C-221 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Repair the defective connector.

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC310403

A-25 (GR)

AE

Connector: A-25 <LHD>

Harness side

AC310398

A-25 (GR)

AE

Connector: A-25 <RHD>

Harness side

AC310626

Connector: C-221

Junction block (Rear view)

<LHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

AC310620

Connector: C-221

Junction block
(Rear view)

<RHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-44

Step 11. Check the wiring harness between C-221
ETACS-ECU connector terminal No.59 and A-15X
front-ECU connector terminal No.22.

NOTE:

Prior to the wiring harness inspection, check joint
connector C-01 and intermediate connector C-125,
and repair if necessary.

• Check the communication lines for open circuit.

Q: Is the check result normal?

YES :

Go to Step 12.

NO :

Repair the wiring harness.

AC311521AC

Connector: A-15X

Relay box side

21

22

23

24

25

26

27

28

29

30

31

AC310626

Connector: C-221

Junction block (Rear view)

<LHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

AC310620

Connector: C-221

Junction block
(Rear view)

<RHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

AC310614

AT

Connectors: C-01, C-125 <LHD>

C-125

C-125

C-01

C-01

AC310631AE

Connector: C-01 <RHD>

AC310628AB

Connector: C-125 <RHD>