Mitsubishi Evolution X. Manual — part 1069
ETACS
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CHASSIS ELECTRICAL
54A-637
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check ETACS-ECU connectors C-315 and C-317
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is ETACS-ECU connectors C-315 and C-317 in good
condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s) (Refer
to GROUP 00E, Harness Connector Inspection
STEP 2. Check the ground circuit to the ETACS-ECU.
Measure the resistance at ETACS-ECU connectors C-315
and C-317.
(1) Disconnect ETACS-ECU connector C-315 and C-317 and
measure the resistance available at the wiring harness side
of the connector.
(2) Measure the resistance value between ETACS-ECU
connector C-315 terminal 17 and ground.
• The resistance should be 2 ohms or less.
(3) Measure the resistance value between ETACS-ECU
connector C-317 terminal 15 and ground.
• The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 4.
NO : Go to Step 3.
AC608255 BG
Harness side: C-315
AC608255 BH
Harness side: C-317
ETACS
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CHASSIS ELECTRICAL
54A-638
STEP 3. Check the wiring harness between ETACS-ECU
connector C-315 (terminal 17) or C-317 (terminal 15) and
the ground.
Q: Is the wiring harness between ETACS-ECU connector
C-315 (terminal 17) or C-317 (terminal 15) 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.
STEP 4. Check ETACS-ECU connectors C-307 and C-309
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is ETACS-ECU connectors C-307 and C-309 in good
condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s) (Refer
to GROUP 00E, Harness Connector Inspection
STEP 5. Check the battery power supply circuit to the
ETACS-ECU. Measure the voltage at ETACS-ECU
connectors C-307 and C-309.
(1) Disconnect ETACS-ECU connectors C-307 and C-309
measure the voltage available at the wiring harness side of
the connector.
(2) Measure the voltage between ETACS-ECU connector
C-307 terminal 2 and ground.
• The voltage should measure approximately 12 volts
(battery positive voltage).
(3) Measure the voltage between ETACS-ECU connector
C-309 terminal 1 and 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 7.
NO : Go to Step 6.
AC608254 BF
Harness side: C-307
AC608254 BI
Harness side: C-309
ETACS
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CHASSIS ELECTRICAL
54A-639
STEP 6. Check the wiring harness between ETACS-ECU
connectors C-307 (terminal 2) or C-309 (terminal 1) and the
fusible link (36) or (34).
Q: Is the wiring harness between ETACS-ECU connectors
C-307 (terminal 2) or C-309 (terminal 1) and the fusible
link (36) or (34) 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. The system
should communicate with the ETACS-ECU normally.
STEP 7. Retest the system
Check that the ETACS-ECU functions work normally.
Q: Is the check result satisfactory?
YES : The procedure is complete (If no malfunctions are
found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
NO : Replace the ETACS-ECU.
TROUBLE SYMPTOM CHART FOR INPUT SIGNAL
M1545004900249
Trouble symptom
Inspection
Procedure
No.
Reference
page
ETACS-ECU does not receive any signal from the ignition switch (ACC).
1
ETACS-ECU does not receive any signal from the ignition switch (IG1).
2
ETACS-ECU does not receive any signal from the key reminder switch.
3
ETACS-ECU does not receive any signal from the front door lock actuator.
4
ETACS-ECU does not receive any signal from the front door switch (LH).
5
ETACS-ECU does not receive any signal from the front door switch (RH).
6
ETACS-ECU does not receive any signal from the rear door switch (LH).
7
ETACS-ECU does not receive any signal from the rear door switch (RH).
8
ETACS-ECU does not receive any signal from the trunk lid latch.
9
ETACS-ECU does not receive any signal from the hazard warning light switch.
10
ETACS-ECU does not receive any signal from the column switch signal.
11
ETACS-ECU does not receive any signal from the hood switch.
12
ETACS
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CHASSIS ELECTRICAL
54A-640
INPUT SIGNAL PROCEDURES
Inspection Procedure 1: ETACS-ECU does not receive any signal from the ignition switch (ACC).
.
TECHNICAL DESCRIPTION (COMMENT)
If there is an error to the ignition switch (ACC) input
signal, or the ACC relay inside the ETACS-ECU does
not operate, the ignition switch (ACC) signal is no
longer output to the communication line.
.
TROUBLESHOOTING HINTS
• The ETACS-ECU may be defective
• The ignition switch 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 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 2.
NO : Repair or replace the damaged component(s) (Refer
to GROUP 00E, Harness Connector Inspection
). Check that the input signal of ignition switch
(ACC) is normal.
Ignition Switch (ACC) Input Circuit
ETACS-ECU
IGNITION
SWITCH (ACC)
AC708972AB
Connector: C-317
Junction block
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