Mitsubishi Lancer Evolution IX. Manual - part 261

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-303

COMMENTS ON TROUBLE SYMPTOM

Vehicle speed sensor signal is used to operate the 
windshield wiper (vehicle speed-dependent wiper 
function). If this signal is abnormal, the windshield 
wipers do not work normally.

POSSIBLE CAUSES

• Malfunction of the vehicles speed sensor

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the speedometer.
Check that the speedometer works normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Diagnose the combination meter (Refer to 
GROUP 54A 

− Combination meter 

P.54A-34

).

Vehicle Speed Signal Input Circuit <RHD>

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple

ETACS-ECU

VEHICLE
SPEED SENSOR

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-304

Step 2. Connector check: B-04 vehicles speed 
sensor connector and C-228 ETACS-ECU 
connector

Q: Are the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector. 

Step 3. Check the wiring harness between B-04 
vehicles speed sensor connector terminal No.3 
and C-228 ETACS-ECU connector terminal No.63.

AC310450

Connector: C-228

AH

Junction block 
(rear view)

Harness side

<LHD>

51

52

53

54

55

56

57

58

59

58 5756 55 54 53 52 51 60

74 7372

71 70 69

AC310461

Harness side

Junction block (rear view)

Connector: C-228

AG

<RHD>

51

52

53

54

55

56

57

58

59

58 5756 55 54 53 52 51 60

74 7372

71 70 69

AC310439AB

B-04(B)

Harness side

Connector: B-04
<LHD>

AC310477

Connector: B-04
<RHD>

AB

Harness side

B-04(B)

AC310450

Connector: C-228

AH

Junction block 
(rear view)

Harness side

<LHD>

51

52

53

54

55

56

57

58

59

58 5756 55 54 53 52 51 60

74 7372

71 70 69

AC310461

Harness side

Junction block (rear view)

Connector: C-228

AG

<RHD>

51

52

53

54

55

56

57

58

59

58 5756 55 54 53 52 51 60

74 7372

71 70 69

AC310439AB

B-04(B)

Harness side

Connector: B-04
<LHD>

AC310477

Connector: B-04
<RHD>

AB

Harness side

B-04(B)

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-305

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-21 <LH driver vehicles>, combination 
meter connector C-101 <RH drive vehicles> and 
intermediate connector B-27 and C-124, and repair if 
necessary.

• Check the input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

Step 4. Pulse check
Check the vehicle speed sensor signal.

OK: The M.U.T.-II/III sounds or the voltmeter 
needle fluctuates.

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.

AC310447

Connector: C-21,C-124
<LHD>

AD

C-21 (B)

C-124 (B)

C-124

C-21

AC310456

Connector: C-101
<RHD>

AF

Harness side

AC310439

Connector: B-27 <LHD>

AC

System switch

Check condition

Vehicle speed sensor 
signal

When the vehicle speed 
has reached 10 km/h or 
more

AC310477

Connector: B-27 <RHD>

AC

AC310454

Connector: C-124
<RHD>

AD

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-306

INSPECTION PROCEDURE L-14: Each switch signal of the keyless entry transmitter is not received.

CAUTION

Whenever the ECU is replaced, ensure that the 
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the keyless entry transmitter is 
used to operate the keyless entry system. If the sig-
nal is abnormal, the keyless entry system will not 
work normally.

POSSIBLE CAUSES

• Malfunction of the keyless entry transmitter

• Defective battery of the keyless entry transmitter

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

Step 1. Pulse check
Check whether the ETACS-ECU receives signal from 
a transmitter or not. For this check, you should use 
the 2-button-type transmitter (integrated with a key), 
which cover screw is silver and has already been 
registered.
NOTE: For how to register the keyless entry trans-
mitter encrypted code, refer to GROUP 42 

−

 

On-vehicle Service 

P.42-43

.

OK: The M.U.T.-II/III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Go to Step 4.

Step 2. Check the transmitter battery.
Refer to GROUP 42 

− Keyless entry system 

P.42-46

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the keyless entry transmitter 
battery.

Step 3. Register the encrypted code, and then 
retest the system.
(1) Register the keyless entry transmitter again.
(2) Check that each signal is received from the 

keyless entry transmitter.

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 keyless entry transmitter.

Step 4. Retest the system.
Check that each signal is received from the keyless 
entry transmitter.

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.

W3Z10E39AA

KEYLESS ENTRY 
TRANSMITTER

KEYLESS ENTRY 
RECEIVER

ETACS-ECU

Transmitter Input Circuit

System switch

Check condition

Keyless entry transmitter 
"LOCK/UNLOCK" switch

When the switch is 
turned from off to on