Mitsubishi Evolution X. Manual - part 1012

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CHASSIS ELECTRICAL

54A-409

SYMPTOM PROCEDURES

 Inspection Procedure 1: No navigation screen is displayed.

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the ground circuit, and the communi-

cation circuit are normal. (Check that the voltage is 10 V or more.)

Multivision Display Power Supply Circuit

ACC
RELAY 2

FUSIBLE
LINK

36

FUSIBLE
LINK

37

ETACS-
ECU

RELAY BOX
 ENGINE 
 COMPARTMENT

MULTIVISION DISPLAY

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DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• 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

STEP 1. Check multivision display connector C-10, C-12, 
C-13 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector.
Q: Is multivision display connector C-10, C-12, C-13 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 multivision display 
connector. Measure the resistance at multivision display 
connector C-10, C-12, C-13.
(1) Disconnect multivision display connectors C-10, C-12, 

C-13, and measure the resistance available at the wiring 
harness side of the connector.

(2) Measure the resistance between multivision display 

connector C-13 terminal 9 and ground.

OK: The resistance should be 2 ohms or less

AC708951BL

Connectors: C-10, C-12, C-13, C-106, C-108

C-13 (GR)

C-10 (GR)

C-12 (GR)

C-106

C-108

AC708972BB

Connectors: C-315, C-317

ETACS-ECU

C-315

C-317

AC709322 AY

Harness side: C-13

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(3) Measure the resistance between multivision display 

connector C-10 terminal 55 and ground.

OK: The resistance should be 2 ohms or less

(4) Measure the resistance between multivision display 

connector C-12 terminal 25 and ground.

OK: 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.

STEP 3. Check the wiring harness between multivision 
display connector C-13 (terminal 9), C-10 (terminal 55), 
C-12 (terminal 25) and ground.

• Check the ground wires for open circuit.

NOTE: Also check intermediate connector C-108, C-106 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in the connector. If intermediate connector C-108, C-106 
is damaged, repair or replace the connector as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between multivision display 

connector C-13 (terminal 9), C-10 (terminal 55), C-12 
(terminal 25) and ground in good condition?
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 :  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. Using scan tool MB991958, read the ETACS-ECU 
diagnostic trouble code. 
Check if the diagnostic trouble code is set to the ETACS-ECU.
Q: Is the DTC set?

YES : Troubleshoot the ETACS-ECU. Refer to GROUP 54A, 

Diagnosis 

P.54A-582

.

NO :  Go to Step 5.

AC709322 AZ

Harness side: C-10

AC709322 BA

Harness side: C-12

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STEP 5. 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 6.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 6. Check the power supply circuit to the muitivision 
display. Measure the voltage at muitivision display 
connector C-13, C-12.
(1) Disconnect the connector, and measure at the wiring 

harness-side connector.

(2) Measure the voltage between muitivision display connector 

C-13 terminal 17 and ground.

OK: Battery voltage

(3) Measure the voltage between muitivision display connector 

C-12 terminal 21 and ground.

OK: Battery voltage

Q: Is the measured voltage battery voltage?

YES : Go to Step 8.
NO :  Go to Step 7.

AC709325 AK

Harness side: C-13

AC709325 AL

Harness side: C-12