Mitsubishi Evolution X. Manual — part 946
HEADLIGHT
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STEP 2. 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 the
Scan Tool (M.U.T.-III)
."
(2) Turn the ignition switch from "LOCK" (OFF) position to "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 3.
NO : Repair the CAN bus line. (Refer to GROUP 54C,
).
STEP 3. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code.
(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) Check whether the ETACS-ECU related DTC is set.
(4) 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 4.
STEP 4. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Perform the actuator test for the combination meter, and
check that the high-beam indicator light illuminates (Refer
to combination meter
).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result normal?
YES : Replace the ETACS-ECU.
NO : Replace the combination meter.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
HEADLIGHT
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Inspection Procedure 7: The headlight automatic shutdown function does not work normally.
CAUTION
Whenever the ECU is replaced, ensure that the
power supply circuit, the ground circuit and the
communication circuit are normal.
.
OPERATION
The ETACS-ECU operates this function in accor-
dance with the input signals from column switch
(lighting switch), ignition switch (IG1), and front door
switch (LH).
.
TECHNICAL DESCRIPTION (COMMENT)
If the headlight automatic shutdown function does
not work normally, the above described input circuits
or ETACS-ECU may have a problem. Also, it may be
possible that the headlight automatic shutdown func-
tion is set to "Disable" through configuration function.
.
TROUBLESHOOTING HINTS
• Malfunction of front door switch (LH)
• Malfunction of the ETACS-ECU
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN communication system)
HEADLIGHT
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STEP 1. Using scan tool MB991958, Check the
configuration function.
Use the ETACS-ECU configuration function to check that the
"Head light auto cut customize" is set to "C-spec."
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 the
scan tool (M.U.T.-III)
(2) Turn the ignition switch to the "ON" position.
(3) Use the ETACS-ECU configuration function to check that
the "Headlight auto cut customize" is set to "C-spec."
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Use the ETACS-ECU configuration function to set the
"Headlight auto cut customize" to "C-spec." (Refer to
).
STEP 2. Using scan tool MB991958, read the diagnostic
trouble code.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether the ETACS-ECU related DTC is set.
(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 3.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
HEADLIGHT
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STEP 3. Using scan tool MB991958, check data list.
Use the ETACS-ECU service data to check the signals related
to the operation of headlight automatic shutdown function.
• Turn the ignition switch to the LOCK (OFF) position.
• Illuminate the headlights.
• Open the driver's door.
Q: Does scan tool MB991958 display the items "Head light
LO ON duty", "IG voltage" and "Dr door ajar switch" as
normal condition?
YES : Go to Step 4.
NO : Troubleshoot the ETACS-ECU. Refer to ETACS,
.
STEP 4. Retest the system
Check that the headlight automatic shutdown function works
normally.
Q: Is the check result normal?
YES : The trouble can be an intermittent malfunction (Refer
to GROUP 00
− How to use
Troubleshooting/inspection Service Points, How to
Cope with Intermittent Malfunction
NO : Replace the ETACS-ECU.
Item No.
Item name
Normal
condition
Item 206
Head light LO ON
duty
100%
Item 254
IG voltage
0 V
Item No.
Item name
Normal
condition
Item 256
Dr door ajar switch
Open
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