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Home >> Mitsubishi >> 2006 >> Lancer L4-2.0L SOHC >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Inspection Procedure 2

Inspection Procedure 2

INSPECTION PROCEDURE 2: When the Ignition Key is Turned to ON (Engine Stopped), the ABS Warning Light does not Illuminate.









CIRCUIT OPERATION
^ The ABS warning light power is supplied from the ignition switch. The ABS-ECU grounds the circuit to illuminate the light.
^ The ABS-ECU illuminates the ABS warning light for 3 seconds while running self-check. This light can be illuminated for 3 seconds upon start-up or when the ignition switch is turned to the ON position with engine stopped.
^ When the ABS-ECU connector is disconnected, the circuit is grounded to illuminate the light by the ABS warning light relay ON operation.
^ The ABS-ECU controls the continuity to the ABS warning light by turning the power transistor in the unit OFF and ON to turn the ABS warning light relay ON and OFF, respectively.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be: an open circuit in the ABS warning light power supply circuit, a blown ABS warning light bulb, or a short circuit to ground between the ABS warning light and the ABS-ECU.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
^ Blown fuse
^ Damaged wiring harness or connector
^ Burnt out ABS warning light bulb
^ Malfunction of the ABS warning light relay
^ Malfunction of the hydraulic unit (integrated with ABS-ECU)

DIAGNOSIS
Required Special Tool:
^ MB991223: Harness Set

STEP 1. Check the ABS warning light relay circuit at ABS-ECU connector B-118.





1. Disconnect ABS-ECU connector B-118.
2. Turn the ignition switch to the ON position.
Q: Does the ABS warning light illuminate?
YES: Retest the system. If the malfunction persists, replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 9. If the malfunction is not reproduced, an intermittent malfunction is suspected. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.
NO: Go to Step 2.

STEP 2. Check the ABS warning light relay.








1. Remove the ABS warning light relay.
2. Check for continuity between terminals 2 - 5 when battery positive voltage (approximately 12 volts) is applied between terminals 1 - 3.
Q: Is the ABS warning light relay normal?
YES: Go to Step 3.
NO: Replace it and then go to Step 9.

STEP 3. Check the ABS warning light circuit at ABS warning light relay connector C-213.





1. Disconnect ABS warning light relay connector C-213 and measure at the harness side.
2. Ground terminal 5.
3. Turn the ignition switch to the ON position, and then ABS warning light should turn on.
Q: Does the warning light turn on?
YES: Go to Step 8.
NO: Go to Step 4.

STEP 4. Check the ABS warning light bulb.
1. Remove the combination meter
2. Check the ABS warning light bulb.
Q: Is the bulb burned out?
YES: Replace the bulb and then go to Step 9.
NO: Go to Step 5.

STEP 5. Check the combination meter power supply circuit.





1. Disconnect connector C-01, and check at the harness side.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between terminal 9 and ground. It should be battery positive voltage (approximately 12 volts).
Q: Is battery positive voltage (approximately 12 volts) present?
YES: Go to Step 6.
NO: Go to Step 7.

STEP 6. Check the harness wire between the combination meter connector C-01 terminal 13 and the ABS warning light relay connector C-213 terminal 5.








NOTE: After inspecting combination meter connector C-01 and ABS warning light relay connector C-213, inspect the wire. If the combination meter connector C-01 and ABS warning light relay connector C-213 is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 9.

Q: Is the harness wire between the combination meter connector C-01 terminal 13 and the ABS warning light relay connector C-213 terminal 5 damaged?
YES: Repair the harness wire and then go to Step 9.
NO: Replace the combination meter (printed circuit board) and then go to Step 9.

STEP 7. Check the harness wire between the ignition switch (IG1) connector C-208 terminal 2 and the combination meter connector C-01 terminal 9.








NOTE: After inspecting intermediate connectors C-21, C-211 and C-214, inspect the wire. If the intermediate connector C-21, C-211 or C-214 is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 9.





Q: Is the harness wire between the ignition switch (IG1) connector C-208 terminal 2 and the combination meter connector C-01 terminal 9 damaged?
YES: Repair the harness wire and then go to Step 9.
NO: Go to Step 9.

STEP 8. Check the harness wire between the ABS warning light relay connector C-213 terminal 2 and ground.








NOTE: After inspecting intermediate connector C-06, inspect the wire. If intermediate connector C-06 is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 9.





Q: Is the harness wire between the ABS warning light relay connector C-213 terminal 2 and ground?
YES: Repair the harness wire and then go to Step 9.
NO: Go to Step 9.

STEP 9. Retest the system.
Q: Does the ABS warning light illuminate for 3 seconds when the ignition switch is turned to the ON position with engine stopped or upon start-up?
YES: The procedure is complete.
NO: Return to Step 1.


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