Mitsubishi Evolution X. Manual — part 948
HEADLIGHT
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CHASSIS ELECTRICAL
54A-153
Inspection Procedure 8: Daytime running light function does not work normally. <Discharge type
headlight>
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
Daytime Running Light Circuit
FUSIBLE
LINK
36
DAYTIME
RUNNING
LIGHT RELAY
HEADLIGHT
ASSENMBLY
(DRL: LH) (DRL: RH)
RELAY BOX
ENGINE
COMPARTMENT
ETACS-ECU
HEADLIGHT
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CHASSIS ELECTRICAL
54A-154
.
COMMENTS ON TROUBLE SYMPTOM
If the daytime running lights do not illuminate, the
wiring harness connector(s), the bulb or the
ETACS-ECU may have a problem.
.
PROBABLE CAUSES
• Burned-out daytime running light bulb
• Malfunction of the daytime running light relay
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
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
STEP 1. Check that the tail/stop lights and headlights
operate.
Check that the tail/stop lights and headlights illuminate nor-
mally.
Q: Do the tail/stop lights and headlights operate normally?
YES : Go to Step 2.
NO : Check the tail/stop lights and the headlights (Refer to
trouble symptom chart
AC709111
Connector: A-24X
AF
AC708949AI
Connector: A-41
A-41 (B)
AC708948AK
Connector: A-56
A-56 (B)
AC708972AP
Connector: C-312
ETACS-ECU
HEADLIGHT
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CHASSIS ELECTRICAL
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STEP 2. Check the daytime running light bulb.
(1) Remove the daytime running light bulb.
(2) Verify that the daytime running light bulb is not damaged or
burned out.
Q: Is the daytime running light bulb in good condition?
YES : Go to Step 3.
NO : Replace the fog light bulb. Verify that the daytime
running lights illuminate normally.
STEP 3. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect
scan tool (M.U.T.-III)
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 4.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
STEP 4. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code.
Check whether ETACS-ECU DTCs are set.
(1) Turn the ignition switch to the "ON" position.
(2) Check for ETACS-ECU DTCs.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Diagnose the ETACS-ECU. Refer to ETACS,
.
NO : Go to Step 5.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
HEADLIGHT
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STEP 5. Using scan tool MB991958, read the MFI system
diagnostic trouble code.
Check whether engine control module DTCs are set or not.
(1) Turn the ignition switch to the "ON" position.
(2) Check for engine control module DTCs.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Diagnose the MFI system. Refer to GROUP 13A,
.
NO : Go to Step 6.
STEP 6. Check the parking brake switch.
Check the input signals from the parking brake switch.
(1) Turn the ignition switch to the "ON" position.
(2) Check that the brake warning light on the combination
meter goes off when the parking brake lever is released.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the brake warning light go off?
YES : Go to Step 7.
NO : Refer to GROUP 36, Diagnosis, Inspection Procedure
. Verify that the daytime running light function
does not work normally.
STEP 7. Check daytime running light (LH) connector A-41,
daytime running light (RH) A-56 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Is daytime running light (LH) connector A-41, daytime
running light (RH) A-56 in good condition?
YES : Go to Step 8.
NO : Repair the damaged parts.
STEP 8. Check the ground circuit to the daytime running
light (LH) or daytime running light (RH). Measure the
resistance at daytime running light (LH) connector A-41 or
daytime running light (RH) connector A-56.
(1) Disconnect the connector, and measure at the wiring
harness side.
(2) Check the resistance between the fog light connector and
ground.
• Resistance between A-41 daytime running light (LH)
connector terminal No.1 and ground
• Resistance between A-56 daytime running light (RH)
connector terminal No.1 and ground
OK: The resistance should be 2 ohm or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 10.
NO : Go to Step 9.
AC702818 CZ
Connectors A-41, A-56
(Harness side)
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