Mitsubishi Evolution X. Manual — part 966

FOG LIGHT

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CHASSIS ELECTRICAL

54A-225

STEP 4. Using scan tool MB991958, check data list.
Use the ETACS-ECU data list to check the signals related to
the fog light function.

• Turn the ignition switch to the "ACC" position.

• Turn the fog light switch to ON.

Q: Does scan tool MB991958 display the items "Front fog

light" as normal condition?
YES : Go to Step 5.
NO : Troubleshoot the ETACS-ECU. Refer to ETACS,

Diagnosis - Inspection Procedure 12 "ETACS-ECU
does not receive any signal from the column switch
signal."

P.54A-639

.

STEP 5. Check fog light relay connector A-15X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog light relay connector A-15X in good condition?

YES : Go to Step 6.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

.

STEP 6. Check the fog light relay.
Refer to

P.54A-237

.

Q: Is the fog light relay in good condition?

YES : Go to Step 7.
NO : Replace the fog light relay.

Item No.

Item name

Normal
condition

Item 212

Front fog light

ON

FOG LIGHT

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CHASSIS ELECTRICAL

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STEP 7. Check the battery power supply circuit to the fog
light relay. Measure the voltage at fog light relay connector
A-15X.

CAUTION

The top and bottom of the fog light relay are difficult to
identify. Prior to inspection, confirm the triangle mark on
the relay box.
(1) Disconnect fog light relay connector A-15X and measure

the voltage available at the relay box side of the connector.

(2) Measure the voltage between terminal 2 and ground, and

between terminal 4 and ground.

• The voltage should measure approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Go to Step 9.
NO : Go to Step 8.

STEP 8. Check the wiring harness between fog light relay
connector A-15X (terminal 2 and 4) and fusible link (36).

• Check the power supply line for open circuit.

Q: Is the wiring harness between fog light relay connector

A-15X (terminal 2 and 4) and fusible link (36) in good
condition?
YES : Go to Step 13.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

STEP 9. Check ETACS-ECU connector C-312 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-312 in good condition?

YES : Go to Step 10.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

.

AC608254 BA

Relay box side: A-11X

FOG LIGHT

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CHASSIS ELECTRICAL

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STEP 10. Check the wiring harness between fog light relay
connector A-15X (terminal 1) and ETACS-ECU connector
C-312 (terminal 4).
Q: Is the wiring harness between fog light relay connector

A-15X (terminal 1) and ETACS-ECU connector C-312
(terminal 4) in good condition?
YES : Go to Step 11.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

STEP 11. Check the wiring harness between fog light relay
connector A-15X (terminal 3) and fog light (LH) connector
A-43 (terminal 2) or fog light (RH) connector A-54 (terminal
2).
NOTE: Also check intermediate connector A-50 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector A-50 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

.

• Check the power supply line for open circuit.

Q: Is the wiring harness between fog light relay connector

A-15X (terminal 3) and fog light (LH) connector A-43
(terminal 2) or fog light (RH) connector A-54 (terminal 2)
in good condition?
YES : Go to Step 12.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

STEP 12. Check the wiring harness between fog light (LH)
connector A-43 (terminal 1) or fog light (RH) connector
A-54 (terminal 1) and ground.
NOTE: Also check intermediate connector A-50 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector A-50 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

.

• Check the ground wires for open circuit.

Q: Is the wiring harness between fog light (LH) connector

A-43 (terminal 1) or fog light (RH) connector A-54
(terminal 1) and ground in good condition?
YES : Go to Step 13.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

FOG LIGHT

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CHASSIS ELECTRICAL

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STEP 13. Retest the system.
Q: Does the fog lights illuminate in good condition?

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

P.00-15

).

NO : Replace the ETACS-ECU.

Inspection Procedure 2: One of the fog lights does not illuminate.

Fog Light Circuit

FOG LIGHT
RELAY

RELAY BOX

ENGINE
COMPARTMENT

FOG LIGHT
(LH) (RH)