Mitsubishi Evolution X. Manual — part 1083
THEFT ALARM
TSB Revision
CHASSIS ELECTRICAL
54A-693
STEP 8. Measure the voltage at ETACS-ECU connector
C-307.
(1) Disconnect ETACS-ECU connector C-307, and measure
the voltage wiring harness side.
(2) Measure the voltage between ETACS-ECU connector-307
(terminal No. 2) and the body ground.
• The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 10.
NO : Go to Step 9.
STEP 9. Check the Wiring harness between ETACS-ECU
connector C-307 (terminal No. 2) and fusible link (36).
• Check the power supply line for open circuit.
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 : Repair the wiring harness between ETACS-ECU
connector C-307 and fusible link (36).
STEP 10. Check ETACS-ECU connector C-317 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-317 in good condition?
YES : Go to Step 11.
NO : Repair the damaged parts.
STEP 11. Check the Wiring harness between ETACS-ECU
connector C-317 (terminal No. 2,9) and center panel unit
connector C-124 (terminal No. 15,12).
NOTE: Also check joint connector C-103 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If joint connector C-103 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection
• Check the input/output lines for open circuit and short cir-
cuit.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair the wiring harness between ETACS-ECU
connector C-317 and center panel unit connector
C-124.
AC402679 FH
Harness side: C-307
THEFT ALARM
TSB Revision
CHASSIS ELECTRICAL
54A-694
STEP 12. Retest the system.
Q: Does the theft-alarm work normally?
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.
Inspection Procedure 2: The interior alarm does not work normally while the theft-alarm is triggered.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the com-
munication circuit are normal.
.
TECHNICAL DESCRIPTION (COMMENT)
If the interior alarm does not work normally, the input
signal circuits to the components below,
ETACS-ECU, or combination meter built-in tone
alarm may have a problem.
• Hood switch
• All of the door switches
• Trunk latch switch
.
TROUBLESHOOTING HINTS
• The ETACS-ECU may be defective
• Combination meter may be defective
• 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)
THEFT ALARM
TSB Revision
CHASSIS ELECTRICAL
54A-695
STEP 1. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code.
Check if DTC is set to the ETACS-ECU.
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) Check whether the ETACS-ECU 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
).
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check actuator test.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the actuator test mode.
• Item 12: Tone alarm
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the combination meter.
STEP 3. Retest the system.
Check that the theft-alarm works normally.
Q: Does the theft-alarm work normally?
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.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
THEFT ALARM
TSB Revision
CHASSIS ELECTRICAL
54A-696
Inspection Procedure 3: Theft-alarm horn does not sound while the theft-alarm system is triggered.
CAUTION
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communi-
cation circuit are normal.
Theft-alarm Horn Circuit
ETACS-ECU
RELAY
BOX
FUSIBLE
LINK
36
THEFT-ALARM
HORN
RELAY
THEFT-ALARM
HORN
AC709111
Connector: A-18X
AI
AC708949
Connector: A-09
AF
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