Mitsubishi Evolution X. Manual - part 1069

ETACS

TSB Revision

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 

P.00E-2

).

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

TSB Revision

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 

P.00E-2

).

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

TSB Revision

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 

P.00-15

).

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

P.54A-640

ETACS-ECU does not receive any signal from the ignition switch (IG1).

2

P.54A-642

ETACS-ECU does not receive any signal from the key reminder switch.

3

P.54A-644

ETACS-ECU does not receive any signal from the front door lock actuator.

4

P.54A-647

ETACS-ECU does not receive any signal from the front door switch (LH).

5

P.54A-654

ETACS-ECU does not receive any signal from the front door switch (RH).

6

P.54A-656

ETACS-ECU does not receive any signal from the rear door switch (LH).

7

P.54A-658

ETACS-ECU does not receive any signal from the rear door switch (RH).

8

P.54A-661

ETACS-ECU does not receive any signal from the trunk lid latch.

9

P.54A-663

ETACS-ECU does not receive any signal from the hazard warning light switch.

10

P.54A-667

ETACS-ECU does not receive any signal from the column switch signal.

11

P.54A-669

ETACS-ECU does not receive any signal from the hood switch.

12

P.54A-670

ETACS

TSB Revision

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 

P.00E-2

). 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