Mitsubishi Lancer (4A9 engine). Manual — part 228
ETACS
CHASSIS ELECTRICAL
54A-574
Inspection Procedure 11: The column switch signal is not received.
CAUTION
Before replacing the ECU, ensure that the com-
munication circuit is normal.
COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU receives the column switch signal
via the LIN communication. If there is an abnormality
to column switch or LIN bus line, the lamps and
wiper/washer do not work normally.
PROBABLE CAUSES
• Malfunction of column switch
• Faulty LIN bus line
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.
Q: Is the diagnosis code set?
YES :
Refer to Diagnosis code chart .
NO :
Go to Step 2.
STEP 2. Column switch check
• Check the continuity for wiper switch. Refer to .
• Check the continuity for column switch (switch
body part). Refer to .
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the wiper switch or column switch
(switch body part).
STEP 3. Check of the troubles
Check that the column switch signal input is normal.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Replace the lighting switch.
Inspection Procedure 12: The hood latch switch signal is not received.
CAUTION
Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.
Hood Switch Input Circuit
ETACS-
ECU
HOOD
SWITCH
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 SI : Silver
ETACS
CHASSIS ELECTRICAL
54A-575
COMMENTS ON TROUBLE SYMPTOM
If there is an error to the hood latch switch input sig-
nal, the hood latch switch signal is no longer output
to the communication line.
PROBABLE CAUSES
• Malfunction of hood latch switch
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check the installation condition.
Check that the hood latch switch is installed to the
body correctly.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Correct the installation condition.
STEP 2. Connector check: A-57 hood latch
switch connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the defective connector.
STEP 3. hood latch switch check
Refer to GROUP 42A
− Hood .
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the hood latch switch.
STEP 4. Resistance measurement at the A-57
hood latch switch connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance between the A-57 hood
latch switch connector terminal No. 1 and the
body earth.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
STEP 5. Wiring harness check between the A-57
hood latch switch connector terminal No. 1 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
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Repair the wiring harness.
STEP 6. Connector check: C-312 ETACS-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the defective connector.
STEP 7. Wiring harness check between the A-57
hood latch switch connector terminal No. 2 and
the C-312 ETACS-ECU connector terminal No. 12
Check the input lines for open circuit and short cir-
cuit.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the wiring harness.
AC607202
AM
Connector: A-57
A-57 (B)
ACA00886
AJ
Connector: C-312 <LHD>
ETACS-ECU
ACA00887
AJ
Connector: C-312 <RHD>
ETACS-ECU
ETACS
CHASSIS ELECTRICAL
54A-576
STEP 8. M.U.T.-III data list
Open the hood.
OK: Normal condition is displayed.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Replace the ETACS-ECU.
Inspection Procedure 13: The stop lamp switch signal is not received.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the earth circuit and the communi-
cation circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
The stop lamp switch input signal is used for the
operation judgment of the functions below. If the sig-
nal is abnormal, these functions will not work.
• ABS, ASC
• AS&G system
PROBABLE CAUSES
• Malfunction of stop lamp switch
• Malfunction of ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-24 stop lamp switch
connector, C-304, C-312 ETACS-ECU connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
STEP 2. Check the stop lamp switch.
Check the stop lamp switch. Refer to GROUP 35A
−
Brake Pedal .
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the stop lamp switch.
STEP 3. Measure the voltage at the C-312 ETACS-
ECU connector
(1) Measure by backprobing without disconnecting
the ETACS-ECU connector and stop lamp switch
connector.
(2) Measure the voltage between the C-312 ETACS-
ECU connector terminal No.16 and the body
earth.
OK:
When the brake pedal is released: Approxi-
mately 0 V
− 5 V (pulse)
When the brake pedal is depressed:
Approximately 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 C-312
ETACS-ECU connector terminal No.16 and C-24
stop lamp switch connector terminal No.1
• Check the signal line for open circuit or short cir-
cuit.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the wiring harness.
STEP 5. Check the wiring harness between C-304
ETACS-ECU connector terminal No.1 and C-24
stop lamp switch connector terminal No.2
• Check the power supply line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 6. M.U.T.-III data list
Brake pedal: depress
OK: Normal condition is displayed.
Q: Is the check result normal?
Item No.
Item name
Normal
conditio
ns
Item 266
Hood latch switch
ON
Item No.
Item name
Normal
condition
Item 290
Stop lamp switch
ON
ETACS
CHASSIS ELECTRICAL
54A-577
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Replace the ETACS-ECU.
CHECK WITH TERMINAL VOLTAGE
M1545004800480
CONNECTOR: C-301
ACA01377
C-304
C-307
C-309
C-312
C-301
C-313
C-311
C-314
C-315
C-317
C-316
AC
AC507030AB
Terminal
No.
Check item
Check condition
Normal
condition
1
−9
−
−
−
10
Input to front passenger's door lock
actuator (unlock)
Front passenger's door lock: Unlocked
1 V or less
11
Input to driver's door lock actuator
(lock)
Driver's door lock: Locked
1 V or less
12
Defogger output
Defogger switch: ON
1 V or less
13
−18
−
−
−
19
Hazard warning lamp switch input
Hazard warning lamp switch: ON
1 V or less
20
−
−
−
21
Windshield wiper backup input
Windshield low-speed wiper switch or
windshield high-speed wiper switch: ON
1 V or less
22
Input to driver's door lock actuator
(unlock)
Driver's door lock: Unlocked
1 V or less
23
−
−
−
24
Input to remote controlled mirror
switch (folding/unfolding switch)
Remote controlled mirror switch (folding/
unfolding switch): ON
1 V or less
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