Mitsubishi Lancer Evolution IX. Manual — part 196
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-43
COMMENTS ON TROUBLE SYMPTOM
It is suspected that the power supply circuit to the
front-ECU is defective, or the wiring harness
between the SWS monitor and the front-ECU or their
connector(s) is damaged. If the battery power supply
circuit to the ECU (terminal No.5 of the front-ECU) is
damaged, also check the power supply circuit from
the ignition switch (IG2) (terminal No.22 of the
front-ECU), and repair if necessary.
POSSIBLE CAUSES
• Malfunction of the front-ECU
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the
ETACS-ECU and the SWS communication lines are
normal.
• Ignition switch: OFF
ECUS TO BE CHECKED
• ETACS ECU
OK: "OK" is displayed on the "ETACS ECU"
menu.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure A-3
"Communication with the ETACS-ECU is
not possible
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) Disconnect the connector, and measure at the
relay box side.
(2) Ignition switch: ON
(3) Voltage between A-10X front-ECU connector
terminal No.7 and body earth
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
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.
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
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-44
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
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) Disconnect the connector, 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 terminal connector terminal No.31 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
Cope with Intermittent Malfunction
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
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-45
Step 9. Check the wiring harness between A-11X
front-ECU connector terminal No.22 and C-228
ETACS-ECU connector terminal No.59.
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
AC310447
AG
Connectors: C-101, C-129 <LHD>
C-101 (L)
C-129
C-129
C-101
AC310456
Connector: C-101 <RHD>
AQ
C-101 (L)
AC310454
Connector: C-129 <RHD>
AV
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-46
Step 10. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the
front-ECU and the SWS communication lines are
normal.
• Ignition switch: ON
ECUS TO BE CHECKED
• FRONT ECU
OK: "OK" is displayed on the "FRONT ECU"
menu.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Replace the front-ECU.
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