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Home >> Mitsubishi >> 2000 >> Eclipse GT V6-3.0L SOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> L - Charts >> Inspection Procedure L-1

Inspection Procedure L-1

Fog Light Relay Drive Circuit:




Connectors:






CIRCUIT OPERATION
When the fog light switch is turned on while the front-ECU is illuminating the headlights (low-beam), the ETACS-ECU sends a 'light on' signal to the front-ECU, causing the front-ECU to illuminate the fog lights.

TECHNICAL DESCRIPTION (COMMENT)
If the headlights illuminate normally, the fog light relay, the fog light switch, the front-ECU or the ETACS-ECU may be defective.

NOTE: If only one of the fog lights or the fog light indicator light does not illuminate, the relevant bulb may be burned out or the harness wire between the defective light and the fog light relay may be defective. In this case, check the relevant circuit by referring to Fog Light

TROUBLESHOOTING HINTS
- Malfunction of the fog light relay
- Malfunction of the fog light switch
- Malfunction of the front-ECU
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS
Required Special Tools:
MB991223: Test Harness Set
MB991502: Scan Tool (MUT-II)
MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the headlight operation.
If the headlights do not illuminate normally, solve the problem first.
If the headlights illuminate normally, go to Step 2.

STEP 2. Check the input signal.
Check the input signals from the fog light switch.






CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.





1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
2. Check that the voltmeter indicator deflects once when the input signal enters.
If a defect appears, check the fog light input signal circuit. Refer to Inspection Procedure O-5.
If no defect appears, go to Step 3.







STEP 3. Check the fog light relay.
If the fog light relay is damaged, replace it. The fog lights should illuminate.
If the fog light relay is not damaged, go to Step 4.




STEP 4. Check the fog light relay power supply circuit at the fog light relay connector A-06X.
1. Disconnect the fog light relay connector A-06X and measure at the relay box side.
2. Voltage between terminal 4 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).

3. Voltage between terminal 1 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If one of the checks above does not show approximately 12 volts, go to Step 5.
If both of the checks above show approximately 12 volts, go to Step 7.




STEP 5. Check the fog light relay connector A-06X for damage.
If the fog light relay connector A-06X is damaged, repair or replace it. Refer to Harness Connector Inspection.
The fog lights should illuminate.
If the connector is in good condition, go to Step 6.




STEP 6. Check the harness wire between fog light relay connector A-06X and battery.
If the harness wire between fog light relay connector A-06X and battery is damaged, repair it.
The fog lights should illuminate.




STEP 7. Check the fog light relay connector A-06X and front-ECU connector A-09X for damage.
If the fog light relay connector A-06X and front-ECU connector are damaged, repair or replace them. Refer to Harness Connector Inspection.
The fog lights should illuminate.
If the connectors are in good condition, go to Step 8.




STEP 8. Check the harness wire between fog light relay connector A-06X and front-ECU connector A-09X.
If the harness wire between fog light relay connector A-06X and front-ECU connector A-09X is damaged, repair it. The fog lights should illuminate.
If the harness wire is in good condition, go to Step 9.







STEP 9. Check the fog light connectors A-28 and A-31 and combination meter connector C-43 for damage.
If the fog light connectors A-28 and A-31 and combination meter connector C-43 are damaged, repair or replace them. Refer to Harness Connector Inspection. The fog lights should illuminate.
If the connectors are in good condition, go to Step 10.













STEP 10. Check the harness wires between fog light relay connector A-06X and fog light connectors A-28 and A-31 and combination meter connector C-43.

NOTE: After checking intermediate connectors C-06 and C-89, check the wires. If intermediate connectors C-06 and C-89 are damaged, repair or replace them. Refer to Harness Connector Inspection.

If the harness wires between fog light relay connector A-06X and fog light connectors A-28 and A-31 are damaged, repair them.
The fog lights should illuminate.

If the harness wires are in good condition, replace the front-ECU or ETACS-ECU.
The fog lights should illuminate.
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