Curiosii for ever!: Car repair manuals for everyone.
Home >> Mitsubishi >> 2003 >> Lancer L4-2.0L SOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> J - Charts >> Inspection Procedure J-12

Inspection Procedure J-12

Headlight and Taillight: When the daytime running light function is operating, the headlights (high-beam) continue lighting even if the headlight switch turns on.

Daytime Running Light Power Supply Circuit:






TECHNICAL DESCRIPTION (COMMENT)
The daytime running light-ECU may be defective if the daytime running light function does not operate normally.

TROUBLESHOOTING HINTS
- The daytime running light-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991502: Scan Tool (MUT-II)

STEP 1. Check the headlight relay (low) circuit to the daytime running light-ECU. Test at daytime running light-ECU connector A-28.




1. Disconnect daytime running light-ECU connector A-28 and measure the voltage available at the wiring harness side of the connector.
2. Turn the headlight switch to "ON" position.




3. Measure the voltage between terminal 5 and ground.
- The voltage should equal approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery positive voltage)?

YES: Replace the daytime running light-ECU. The daytime running light function should now work normally.

NO: Go to Step 2.







STEP 2. Check daytime running light-ECU connector A-28 and front-ECU connector A-10X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is the daytime running light-ECU connector A-28 and front-ECU connector A-10X in good condition?

YES: Go to Step 3.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The daytime running light function should now work normally.







STEP 3. Check the wiring harness between daytime running light-ECU connector A-28 (terminal 5) and the front-ECU connector A-10X (terminal 6).

Q: Is the wiring harness between daytime running light-ECU connector A-28 (terminal 5) and the front-ECU connector A-10X (terminal 6) in good condition?

YES: Replace the daytime running light-ECU. The daytime running light function should now work normally.

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. The daytime running light function should now work normally.
pro multis · Curiosii