Mitsubishi Evolution X. Manual — part 1077
ETACS
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CHASSIS ELECTRICAL
54A-669
Inspection Procedure 11: ETACS-ECU does not receive any signal from the column switch signal.
.
TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU receives the column switch signal
via the LIN communication. If there is an abnormality
to column switch or LIN bus line, the lights and
wiper/washer do not work normally.
.
TROUBLESHOOTING HINTS
• The column switch may be defective
• The LIN bus line may be defective
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)
STEP 1. Using scan tool MB991958, read the ETACS
diagnostic trouble code.
Check the 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 the
Scan Tool (M.U.T.-III)
."
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Troubleshoot the ETACS-ECU (Refer to
).
NO : Go to Step 2.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
ETACS
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CHASSIS ELECTRICAL
54A-670
STEP 2. Column switch check
• Check the continuity for windshield wiper and windshield
washer switch (Refer to
• Check the continuity for column switch (switch body part)
(Refer to
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 column switch.
Inspection Procedure 12: ETACS-ECU does not receive any signal from the hood switch.
.
Hood Switch Input Circuit
ETACS-
ECU
HOOD
SWITCH
AC708949AJ
Connector: A-48
A-48 (B)
AC708972AP
Connector: C-312
ETACS-ECU
ETACS
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CHASSIS ELECTRICAL
54A-671
TECHNICAL DESCRIPTION (COMMENT)
If there is an error to the hood switch input signal, the
hood switch signal is no longer output to the commu-
nication line.
.
TROUBLESHOOTING HINTS
• The hood switch may be defective
• The ETACS-ECU 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:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check hood switch connector A-48 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is hood switch connector A-48 in good condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the input signal of hood switch is
normal.
STEP 2. Check the hood switch.
Remove the hood switch. Then check continuity between the
switch terminals.
Q: Is the hood switch in good condition?
YES : Go to Step 3.
NO : Replace the hood switch. Check that the input signal
of hood switch is normal.
STEP 3. Check the ground circuit to the hood switch. Test
at hood switch connector A-48.
(1) Disconnect hood switch connector A-48 and measure the
resistance available at the wiring harness side of the
connector.
(2) Measure the resistance value between terminal 1 and
ground.
• The resistance should equal 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 5.
NO : Go to Step 4.
Switch position
Tester
connection
Specified
condition
Released
1
− 2
Less than 2 ohms
Pressed
1
− 2
Open circuit
AC709322 AO
Harness side: A-48
ETACS
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CHASSIS ELECTRICAL
54A-672
STEP 4. Check the wiring harness between hood switch
connector A-48 (terminal 1) and ground.
Check the ground wires for open circuit.
Q: Is the wiring harness between hood switch connector
A-48 (terminal 1) and the ground in good condition?
YES : No action is necessary and testing is complete.
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. Check that
the input signal of hood switch is normal.
STEP 5. Check ETACS-ECU connector C-312 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-312 in good condition?
YES : Go to Step 6.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the input signal of hood switch is
normal.
STEP 6. Check the wiring harness between driver's door
switch connector A-48 (terminal 2) and ETACS-ECU
connector C-312 (terminal 12).
Check the input lines for open circuit and short circuit.
Q: Is the wiring harness between driver's door switch
connector A-48 (terminal 2) and ETACS-ECU connector
C-312 (terminal 12) in good condition?
YES : Replace the ETACS-ECU. Check that the input signal
of hood switch is normal.
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. Check that
the input signal of hood switch is normal.
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