Mitsubishi Lancer Evolution 7. Manual — part 389
54B-1
SMART WIRING
SYSTEM (SWS)
CONTENTS
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Before Commencing Troubleshooting
Standard Flow of Diagnostic Troubleshooting
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Diagnosis Code Inspection Procedures
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SWS -
Special Tools/Troubleshooting
54B-2
SPECIAL TOOLS
Tool
Number
Name
Use
MB991502
MUT-II subassem-
bly
For SWS inspections (diagnosis code display
and input signal check by MUT-II)
MB991529
Diagnosis code
check harness
For checking input signals by voltmeter
A
B
C
D
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Test harness
B: LED harness
C: LED harness
adapter
D: Probe
For checking voltage (continuity and value) at
harnesses and connectors
A: For checking connector pin contact voltage
B: For checking power supply circuits
C: For checking power supply circuits
D: For connection to commercially available
testers
TROUBLESHOOTING
BEFORE COMMENCING TROUBLESHOOTING
Before starting troubleshooting, check the following two points to ensure there are no defects.
D
Check the state of the connector couplings to the ETACS-ECU and junction box.
D
Check that the fuses and fusible links relating to all systems are not fused.
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points.
DIAGNOSTIC FUNCTIONS
READING DIAGNOSIS CODES
Read the diagnosis codes using MUT-II. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points.)
NOTE
1. Connect MUT-II to the 16-pin diagnosis connector (black).
2. The diagnosis code cannot be read when there is an ETACS-ECU fault or when the power is first
turned ON (voltage rising). In this case, refer to “No Communication with MUT-II” (P. 54B-10) on
Fault Symptom Inspection Procedure, and perform troubleshooting.
SWS -
Troubleshooting
54B-3
INPUT SIGNAL CHECK
1. Check the inputs using MUT-II or a voltmeter. (Refer to GROUP 00 - How to Use
Troubleshooting/Inspection Service Points.)
2. The following input signals can be checked using MUT-II or a voltmeter connected to the diagnosis
connector.
NOTE
When fault is detected during input signal inspection, refer to Trouble Symptom Chart to perform
troubleshooting. (Refer to P.54B-7).
Input Signal Check Function
Input signal
Buzzer operation condition
Ignition switch (ACC)
When ignition switch turned from “LOCK” (OFF)
to ACC.
Ignition switch (IG1)
When ignition switch turned from “ACC” to “ON”.
Hazard warning lamp switch
When switch turned from OFF to ON.
Rear fog lamp switch
Driver’s door switch
When driver’s door opened from closed
All door switches
When any door opened when all doors were
closed.
Driver’s door lock actuator
When the driver’s side key cylinder or inside lock
knob is moved from the locked to unlocked
position or vice versa.
Vehicle speed signal
Vehicle speed changes from less than 10 km/h to
10 km/h or more.
Column switches
Tail lamp switch
When lighting switch turned from automatic
lighting to tail lamp position.
Headlamp switch
When lighting switch turned from tail lamp to
headlamp position.
Dimmer switch
When switch turned from OFF to ON.
Passing switch
Left-hand turn signal lamp switch
Right-hand turn signal lamp switch
Windshield mist wiper switch
Windshield wiper intermittent timing switch
Windshield wiper LO speed switch
Windshield wiper HI speed switch
Windshield washer switch
When switch turned from OFF to ON.
Power window
main switch
All switches
When switch turned from OFF to ON.
DIAGNOSIS CODE CHART
Code No.
Diagnosis item
Reference page
11
ETACS-ECU-related failure
54B-4
12
Column switch-related failure or fault in connecting to ETACS-ECU
54B-4
13
Front-ECU-related failure or fault in connecting to ETACS-ECU
54B-5
21
Short circuit in communication lines
54B-6
SWS -
Troubleshooting
54B-4
DIAGNOSIS CODE INSPECTION PROCEDURES
Code No. 11 ETACS-ECU-related failure
Probable cause
The ETACS-ECU monitors its own communication data, outputting this diagnosis
code when data error occurs 15 consecutive times (for 0.6 seconds). The
diagnosis code output stops when the ETACS-ECU confirms that its data was
transmitted normally 15 consecutive times (for 0.6 seconds).
D
ETACS-ECU fault
Replace ETACS-ECU.
Code No. 12 Column switch-related fault or fault in
connecting to ETACS-ECU
Probable cause
This diagnosis code is output when a column switch outputs a signal (at least
three times a second) that is not in accordance with the transmission request
signal from ETACS-ECU. The diagnosis code output stops when the column
switch continuously outputs for one second a signal that accords with the
transmission request signal from ETACS-ECU.
D
Column switch fault
D
ETACS-ECU fault
D
Harness or connector fault
OK
Replace column switch.
NG
Replace ETACS-ECU.
OK
Check the trouble
symptoms.
OK
Check the trouble symptoms.
NG
Check the harness between the
column switch and the body earth,
and repair if necessary.
NG
Check the following connectors:
C-203, C-08
NG
Repair
NG
Repair
NG
Check the harness between the
column switch and the battery.
OK
Check the trouble
symptoms.
NG
Replace ETACS-ECU.
OK
Replace column switch.
Check the trouble symptoms.
NG
Check the harness between the
column switch and ETACS-ECU.
NG
Repair
OK
Check the trouble symptoms.
YES
Test at the C-203 column switch
connector.
D
Disconnect the connector and
test on the harness side.
D
Continuity between terminal 4
and body earth
OK : Continuity confirmed.
OK
Check the following connectors:
C-203, C-102, C-228
NG
Repair
Is code 12 output when the ignition
switch is in the ON position?
NO
Test at the C-203 column switch
connector.
D
Disconnect the connector and
test on the harness side.
D
Voltage between terminal 1 and
body earth
OK : System voltage
NG
Check the following connectors:
<L.H. drive vehicles>
C-203, C-05, C-209
<R.H. drive vehicles>
C-203, C-05, C-135
NG
Repair
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