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) 

P.54A-579

."

(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 

P.54A-582

).

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 

P.54A-279

).

• Check the continuity for column switch (switch body part) 

(Refer to 

P.54A-280

).

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 

P.00-15

).

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 

P.00E-2

. 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 

P.00E-2

. 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.