Mitsubishi Grandis. Manual — part 150

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-62

Step 8. Check the wiring harness from C-221
ETACS-ECU connector terminal Nos.59 and 68 to
C-301 column switch connector terminal Nos.3
and 2.

NOTE:

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

• 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

ECUS 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

Cope with Intermittent Malfunction

P.00-5

).

NO :

Replace the ETACS-ECU.

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)

AC310153AB

Connector: C-301 <LHD>

Harness side

AC310183

AB

Connector: C-301 <RHD>

Harness side

AC310613

AE

Connector: C-01 <LHD>

AC310631AE

Connector: C-01 <RHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-63

Inspection Procedure A-3: Communication with the ETACS-ECU is not possible.

CAUTION

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

ETACS-ECU Power Supply and SWS Communication Circuit <LHD>

FUSIBLE
LINK

IGNITION
SWITCH (IG1)

POWER
SOURCE

ETACS-
ECU

COLUMN-ECU

COLUMN
SWITCH

DIAGNOSIS
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

FRONT SIDE

26

REALAY
BOX

J/B SIDE

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-64

ETACS-ECU Power Supply and SWS Communication Circuit <RHD>

FUSIBLE
LINK

IGNITION
SWITCH (IG1)

POWER
SOURCE

ETACS-
ECU

COLUMN-ECU

COLUMN
SWITCH

DIAGNOSIS
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

FRONT SIDE

26

REALAY
BOX

J/B SIDE

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-65

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.3 of the
ETACS-ECU) is defective, also check the earth
circuit to the sensor (terminal No.56 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: C-219 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-219
ETACS-ECU connector.

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

junction block side.

(2) Voltage between C-219 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.

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block
(Rear view)

<RHD>

AB

Junction block side

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block
(Rear view)

<RHD>

AB

Junction block side

AC310507BP

Connector C-219
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1