Mitsubishi Lancer (4A9 engine). Manual — part 130
FOG LAMP
CHASSIS ELECTRICAL
54A-182
SYMPTOM PROCEDURES
Inspection Procedure 1: The front fog lamps do not illuminate normally.
CAUTION
Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the commu-
nication circuit are normal.
FOG LAMP
CHASSIS ELECTRICAL
54A-183
Front Fog Lamp And ETACS-ECU Communication Circuit
FRONT
FOG LAMP
RELAY
RELAY BOX
ENGINE
COMPARTMENT
ETACS-ECU
FUSIBLE
LINK
38
FUSIBLE
LINK
36
NOTE
:EXCEPT 1800-DIESEL
:1800-DIESEL
FRONT FOG
LAMP
(LH)
(RH)
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
FOG LAMP
CHASSIS ELECTRICAL
54A-184
CIRCUIT OPERATION
If the front fog lamps do not illuminate normally, the
input signal circuit(s) below or the ETACS-ECU may
be defective.
• Tail lamp switch
• Headlamp switch
• Fog lamp switch
• Option coding information
COMMENTS ON TROUBLE SYMPTOM
When the front fog lamps do not illuminate normally,
the mentioned input signal circuit(s) or ETACS-ECU
may be defective.
PROBABLE CAUSES
• Malfunction of column switch
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. ETACS-ECU coding data check
(1) Operate the M.U.T.-III to read the ETACS-ECU
option coding information (Refer to GROUP 00
−
Coding Table ).
(2) Check that the "Front fog lamp" is set to
"Present."
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Operate the M.U.T.-III to set the option
coding "Front fog lamp" to "Present," and
check the trouble symptom.
STEP 2. Check the operation of the position
lamps and the headlamps.
Check that the position lamps and the headlamps
illuminate normally.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Check the position lamps and the
headlamps (Refer to trouble symptom chart
).
STEP 3. M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.
Q: Is the diagnosis code set?
YES :
Troubleshoot the ETACS-ECU. Refer to .
NO :
Go to Step 4.
STEP 4. M.U.T.-III data list
Use the ETACS-ECU service data to check the sig-
nal related to the operation of front fog lamp function.
• Turn the fog lamp switch to ON.
OK: Normal condition is displayed.
Q: Is the check result normal?
AC612144
AC801941
AI
Connector: A-12X
ACA00916
A-49 (B)
Connectors: A-39, A-49
A-39 (B)
AG
ACA00886
AJ
Connector: C-312 <LHD>
ETACS-ECU
ACA00887
AJ
Connector: C-312 <RHD>
ETACS-ECU
Item No.
Item name
Normal
condition
Item 345
Fog lamp ON
ON
FOG LAMP
CHASSIS ELECTRICAL
54A-185
YES :
Go to Step 5.
NO :
Troubleshoot the ETACS-ECU. Refer to
Inspection Procedure 11 "The column
switch signal is not received" .
STEP 5. Connector check: A-12X front fog lamp
relay connector
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the defective connector.
STEP 6. Check the front fog lamp relay
Refer to .
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Replace the front fog lamp relay.
STEP 7. Voltage measurement at the A-12X front
fog lamp relay connector
(1) Remove the front fog lamp relay, and measure at
the relay box side.
(2) Measure the voltage between terminal 2 and the
body earth, and between terminal 4 and body
earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 8.
STEP 8. Wiring harness check between the A-12X
front fog lamp relay connector terminal No. 2/4
and the fusible link (36) <except 1800-DIESEL> or
(38) <1800-DIESEL>
• Check the output lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Repair the wiring harness.
STEP 9. Connector check: C-312 ETACS-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the defective connector.
STEP 10. Wiring harness check between the A-
12X front fog lamp relay connector terminal No. 1
and the C-312 ETACS-ECU connector terminal
No. 4
• Check the output lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Repair the wiring harness.
STEP 11. Wiring harness check between the A-
12X front fog lamp relay connector terminal No. 3
and the A-39 front fog lamp (LH) or A-49 front fog
lamp (RH) connector terminal No. 2
NOTE: Before the wiring harness check, check the
intermediate connector A-44, and then repair that if
necessary.
• Check the output lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the wiring harness.
STEP 12. Wiring harness check between the A-39
front fog lamp (LH) or A-49 front fog lamp (RH)
connector terminal No. 1 and the body earth
NOTE: Before the wiring harness check, check the
intermediate connector A-44, and then repair that if
necessary.
• Check the earth lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Repair the wiring harness.
STEP 13. Retest the system
Check that the front fog lamps illuminate normally.
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.
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