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Home >> Mitsubishi >> 2012 >> Eclipse L4-2.4L (4G69) >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Fog Light >> Inspection Procedure K-1

Inspection Procedure K-1




INSPECTION PROCEDURE K-1: Front fog light: Front fog lights do not illuminate when the front fog light switch is turned on.

NOTE:
This troubleshooting procedure requires the use of scan tool MB991958 and SWS monitor kit MB991813. For details on how to use the SWS monitor, refer to "How to use SWS monitor How to Use SWS Monitor."










CIRCUIT OPERATION

- The ETACS-ECU sends a front fog light illumination request signal ("LIGHT ON" signal) to the front-ECU when the front fog light switch is turned on while the headlights are illuminating at low beam.
- Then the front-ECU switches on its relay to illuminate the front fog lights.

TECHNICAL DESCRIPTION (COMMENT)

If the headlights illuminate at low beam, the front fog light relay, the front fog light switch, the front-ECU or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS

- Trouble in input signal system
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The front fog light relay may be defective
- The front-ECU may be defective
- The ETACS-ECU may be defective

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
- MB991813: SWS Monitor Kit
- MB991806: SWS Monitor Cartridge
- MB991812: SWS Monitor Harness (For Column-ECU)
- MB991822: Probe Harness

STEP 1. Check the headlight (low-beam) operation.

Q. Do the headlights illuminate at low beam normally?

YES Go to Step 2.
NO Refer to Inspection Procedure I-2 "The headlights (low-beam) do not illuminate normally Inspection Procedure I-2."
STEP 2. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.

Set each switch to the following condition before checking input signal from the front fog light switch:

- Ignition switch: ON
- Lighting switch: "HEAD"
- Front fog light switch: ON

NOTE:
Turn the ignition switch to the "ON" position in order to disable the headlight automatic shutdown function.









(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect special tool MB991910 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.

Connect the special tool. Refer to "How to connect SWS monitor How to Connect SWS Monitor."
(2)Operate scan tool MB991958 according to the procedure below to display "F.FOG."

.....Select "Interactive Diagnosis."

.....Select "System select."

.....Select "SWS."

.....Select "SWS MONITOR."

.....Select "Function Diag."

.....Select "LIGHTING."

.....Select "F.FOG."
(3)Check that normal conditions are displayed for the items described in the table below.





Q. Does the scan tool MB991958 display the items "IG SW (IG1)" and "F.FOG LIGHT" as normal condition?

Normal conditions are displayed for all the items : Go to Step 3.

Normal condition is not displayed for "IG SW (IG1)" : Refer to Inspection Procedure M-2 "ETACS-ECU does not receive any signal from the ignition switch (IG1) Inspection Procedure M-2."

Normal condition is not displayed for "F.FOG LIGHT" : Refer to Inspection Procedure M-3 "ETACS-ECU does not receive any signal from the front fog light switch Inspection Procedure M-3."

STEP 3. Check front fog light relay connector A-07X for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is front fog light relay connector A-07X in good condition?

YES Go to Step 4.

NO Repair or replace the damaged component(s). Harness Connector Inspection. Verify that the front fog lights illuminate normally.

STEP 4. Check the front fog light relay.









Q. Is the front fog light relay in good condition?

YES Go to Step 5.

NO Replace the front fog light relay. Verify that the front fog lights illuminate normally.

STEP 5. Check the battery power supply circuit to the front fog light relay. Measure the voltage at front fog light relay connector A-07X.

CAUTION:
The top and bottom of the front fog light relay are difficult to identify. Prior to inspection, confirm the triangle mark on the relay box.





(1)Disconnect front fog light relay and measure the voltage available at the relay box side of the connector.





(2)Measure the voltage between terminal 1 and ground, and also between terminal 2 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 7.

NO Go to Step 6.

STEP 6. Check the wiring harness between front fog light relay connector A-07X (terminals 1 and 2) and the battery.

- Check the power supply line for open circuit and short circuit.





Q. Is the wiring harness between front fog light relay connector A-07X (terminals 1 and 2) and the battery in good condition?

YES No action is necessary and testing is complete.

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. Verify that the front fog lights illuminate normally.

STEP 7. Check front-ECU connector A-13X for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is front-ECU connector A-13X in good condition?

YES Go to Step 8.

NO Repair or replace the damaged component(s). Harness Connector Inspection. Verify that the front fog lights illuminate normally.

STEP 8. Check the wiring harness between front fog light relay connector A-07X (terminal 3) and front-ECU connector A-13X (terminal 11).

- Check the communication lines for open circuit and short circuit.





Q. Is the wiring harness between front fog light relay connector A-07X (terminal 3) and front-ECU connector A-13X (terminal 11) in good condition?

YES Go to Step 9.

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. Verify that the front fog lights illuminate normally.

STEP 9. Replace the ECU.

(1)Replace the front-ECU.

(2)The front fog lights should illuminate normally.

Q. Do the front fog lights illuminate normally?

YES No action is necessary and testing is complete.
NO Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Encrypted Code Registration Criteria Table. Verify that the front fog lights illuminate normally.
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