Mitsubishi 380. Instruction - page 19

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-73

STEP 9. Check the wiring harness between column switch
connector C-309 (terminal 2) and ETACS-ECU connector
C-218 (terminal 62).
Q: Is the wiring harness between column switch connector

C-309 (terminal 2) and ETACS-ECU connector C-218
(terminal 62) in good condition?
YES :
Go to Step 10.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch
(column-ECU) normally.

STEP 10. Replace the column switch.
(1) Replace the column switch.
(2) The system should communicate with the column switch

(column-ECU) normally.

Q: Can the system communicate with the column switch

(column-ECU)?
YES :
No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. The system should

communicate with the column switch (column-ECU)
normally.

54DB006A

CONNECTORS: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

45

46

48 47

49

50
59

51
60

52

53
62

65

61

54
63

56

68

64

67 66

57

58

55

54DB051A

HARNESS SIDE

CONNECTOR: C-309

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-74

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

.

CIRCUIT OPERATION

• The power supply to the ETACS-ECU is provided

by the battery and the ignition switch (IG1).

• If the power supply system from the battery is

defective, the system operates by the power sup-
ply from the ignition switch (IG1).

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

.

TECHNICAL DESCRIPTION (COMMENT)

It is suspected that the power supply circuit to the
ETACS-ECU is defective, or the wiring harness
between the SWS monitor kit and the ETACS-ECU
or their connector(s) is damaged. If the battery power
supply circuit to the ECU (terminal 20 of the

ETACS-ECU) is damaged, also check the power
supply circuit from the ignition switch (IG1) (terminal
8 of the ETACS-ECU), and repair if necessary. If the
ground circuit to the ECU (terminal 3 of the
ETACS-ECU) is damaged, also check the ground cir-
cuit to the sensor (terminal 50 of the ETACS-ECU),
and repair if necessary.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: DIAGNOSTIC TOOL (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

54DB044A

C-219

C-218 (GR)

CONNECTORS: C-218, C-219

54DB050A

CONNECTOR: C-309

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-75

STEP 1. Check ETACS-ECU connectors C-218 and C-219
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Are ETACS-ECU connectors C-218 and C-219 in good

condition?
YES :
Go to Step 2.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. The system should communicate with the

ETACS-ECU normally.

STEP 2. Check the battery power supply circuit to the
ETACS-ECU. Measure the voltage at ETACS-ECU
connector C-219.
(1) Disconnect ETACS-ECU connector C-219 and measure the

voltage available at the junction block side of the connector.

(2) Measure the voltage between terminal 20 and ground.

• The voltage should measure approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES :
Go to Step 4.
NO : Go to Step 3.

54DB045A

CONNECTORS: C-218, C-219

JUNCTION BLOCK
(REAR VIEW)

C-219

C-218 (GR)

HARNESS SIDE

C-218

C-219

JUNCTION BLOCK SIDE

45

46

48 47

49

50
59

51
60

52

53
62

65

61

54
63

56

68

64

67 66

57

58

55

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC209836

201918 171615 1413 1211 10 9 8 7 6 5 4 3 2 1

AE

CONNECTOR C-219
(JUNCTION BLOCK SIDE)

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-76

STEP 3. Check the wiring harness between ETACS-ECU
connector C-219 (terminal 20) and the battery.

NOTE: Also check junction block connector C-214 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector C-214 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Is the wiring harness between ETACS-ECU connector

C-219 (terminal 20) and the battery in good condition?
YES :
No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the ETACS-ECU normally.

STEP 4. Check the ground circuit to the ETACS-ECU.
Measure the resistance at ETACS-ECU connector C-219.
(1) Disconnect ETACS-ECU connector C-219 and measure the

resistance available at the junction block side of the
connector.

(2) Measure the resistance value between terminal 3 and

ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 6.
NO : Go to Step 5.

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

54DB057A

CONNECTOR: C-214

HARNESS SIDE

10

1

6

14

5

12

13

4

11

7

2

3

8

9

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

201918 171615 1413 1211 10 9 8 7 6 5 4 3 2 1

AC209857AB

CONNECTOR C-219
(JUNCTION BLOCK SIDE)

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