Mitsubishi Evolution X. Manual — part 965
FOG LIGHT
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CHASSIS ELECTRICAL
54A-221
TROUBLE SYMPTOM CHART
M1540401000228
Inspection
Procedure No.
Trouble symptom
Reference page
1
All the front fog lights do not illuminate normally.
2
One of the fog lights does not illuminate.
3
The front fog light indicator does not illuminate normally.
FOG LIGHT
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CHASSIS ELECTRICAL
54A-222
SYMPTOM PROCEDURES
Inspection Procedure 1: All the front fog lights do not illuminate normally.
CAUTION
Whenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the com-
munication circuit are normal.
Fog Light and ETACS-ECU Communication Circuit
FUSIBLE
LINK
36
FOG LIGHT
RELAY
RELAY BOX
ENGINE
COMPARTMENT
ETACS-ECU
FOG LIGHT
(LH) (RH)
FOG LIGHT
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CHASSIS ELECTRICAL
54A-223
.
CIRCUIT OPERATION
If all the fog lights do not illuminate normally, the
input signal circuit(s) below or the ETACS-ECU may
be defective.
• Tail light switch
• Headlight switch
• Fog light switch
• Option coding information
.
TECHNICAL DESCRIPTION (COMMENT)
When the fog lights do not illuminate normally, the
mentioned input signal circuit(s) or ETACS-ECU may
be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of the column switch
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
AC709111
Connector: A-15X
AH
AC708949AN
Connectors: A-43, A-50
A-43 (B)
A-50 (B)
AC708948AL
Connector: A-54
A-54 (B)
AC708972AP
Connector: C-312
ETACS-ECU
FOG LIGHT
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CHASSIS ELECTRICAL
54A-224
STEP 1. ETACS-ECU coding data check.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect
scan tool (M.U.T.-III)
(2) Turn the ignition switch to the "ON" position.
(3) Read out the option coding information in ETACS-ECU
(Refer to GROUP 00, Precautions before service, Coding
Table
(4) Check that the "Front fog light" is set to "YES."
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the ETACS-ECU coding data normal?
YES : Go to Step 2.
NO : Operate scan tool MB991958 to set the option coding
"Front fog light" to "Yes," and check the trouble
symptom.
STEP 2. Check that the tail/stop lights and headlights
operate.
Check that the tail/stop lights and headlights illuminate nor-
mally.
Q: Do the tail/stop lights and headlights operate normally?
YES : Go to Step 3.
NO : Check the tail/stop lights and the headlights (Refer to
trouble symptom chart
STEP 3. Using scan tool MB991958, read the other system
diagnostic trouble code.
Check if DTC is set to the ETACS-ECU.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether the ETACS-ECU related DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Troubleshoot the ETACS-ECU (Refer to ETACS,
).
NO : Go to Step 4.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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