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
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
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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