Mitsubishi Evolution X. Manual - part 618

 

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Mitsubishi Evolution X. Manual - part 618

 

 

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-89

STEP 3. Using scan tool MB991958, check for MFI system 
diagnostic trouble code.
Check if DTC is set to the engine control module.
Q: Is the DTC set?

YES : Troubleshoot the MFI system (Refer to GROUP 13A, 

Diagnosis 

P.13A-44

).

NO :  Go to Step 4.

STEP 4. Using scan tool MB991958, check for WCM 
diagnostic trouble code.
Check if DTC is set to the WCM.
Q: Is the DTC set?

YES : Troubleshoot the WCM (Refer to 

P.42C-6

).

NO :  Go to Step 5.

STEP 5. Check that the engine starts.
Q: Does the engine start?

YES : The procedure is complete.
NO :  Refer to GROUP 13A , Diagnosis 

P.13A-44

. When 

the cause of the failure cannot be tracked down by the 
troubleshooting in GROUP 13A, replace WCM and 
register the ID codes (Refer to 

P.42C-9

).

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-90

Inspection Procedure 4: Abnormality in WCM power supply and ground circuits.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the ground circuit and the com-
munication circuit are normal.

.

TECHNICAL DESCRIPTION (COMMENT)

If the WCM does not work at all or if the WCM cannot 
communicate with the scan tool, the WCM power 
supply or the ground circuit may be defective.

WCM Power Supply Circuit

ETACS-
ECU

IMMOBILIZER
ANTENNA

IG1
RELAY

WCM

AC708951CD

Connector: C-07

C-07

AC708972AB

Connector: C-317

Junction block

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-91

.

TROUBLESHOOTING HINTS

• Damaged wiring harness and connectors

• Malfunction of the WCM

DIAGNOSIS

Required Special Tools:

• MB992006: Extra fine probe

• MB991223: Harness set

STEP 1. Check WCM connector C-07 and ETACS-ECU 
connector C-317 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Is the WCM connector C-07 and ETACS-ECU connector 

C-317 in good condition?
YES : 
Go to Step 2.
NO :  Repair the defective connector.

STEP 2. Check the wiring harness between WCM 
connector C-07 (terminal No.6, 9) and the ETACS-ECU 
connector C-317 (terminal No.10, 5) for open circuit.
(1) Disconnect WCM connector C-07 and ETACS-ECU 

connector C-317, and check the wiring harness.

(2) Check the wiring harness between WCM connector C-07 

(terminal No.6) and ETACS-ECU connector C-317 (terminal 
No.10)

OK: Continuity exists (2 

 or less)

(3) Check the wiring harness between WCM connector C-07 

(terminal No.9) and ETACS-ECU connector C-317 (terminal 
No.5)

OK: Continuity exists (2 

 or less)

Q: Is the wiring harness between WCM connector C-07 and 

the ETACS-ECU connector C-317 in good condition?
YES : 
Go to Step 3.
NO :  Repair the wiring harness between WCM connector 

C-07 (terminal No.6, 9) and ETACS-ECU connector 
C-317 (termuinal No.10, 5).

AC709707EQ

Harness side: C-07

Harness side: C-317

AC709707ER

Harness side: C-07

Harness side: C-317

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-92

STEP 3. Check the wiring harness between the WCM 
connector C-07 (terminal No.7) and the ground for open 
circuit. 
(1) Disconnect WCM connector C-07, and check the wiring 

harness.

(2) Check the wiring harness between WCM connector C-07 

(terminal No.7) and ground.

OK: Continuity exists (2 

 or less)

Q: Is the wiring harness between WCM connector C-07 and 

the ground in good condition?
YES : 
Go to Step 4.
NO :  Repair the wiring harness between WCM connector 

C-07 (terminal No.7) and ground.

STEP 4. Retest the system
Q: Does the abnormality in WCM power supply and ground 

circuits 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 :  Replace WCM and register the ID codes (Refer to 

P.42C-9

).

AC709707ES

Harness side: C-07

 

 

 

 

 

 

 

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