Mitsubishi Outlander GS45X. Manual - part 1179

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-83

STEP 1. Check the ignition key inserted in the key cylinder 
for interference.
Q: Are there other ignition keys or anything that interferes 

with the communication (things that generate radio 
waves such as magnets and an air-cleaning device that 
has a power plug) near the ignition key inserted in the 
key cylinder?
YES : Move away or remove other ignition keys or things 

that interfere with the communication (things that 
generate radio waves such as magnets and a 
air-cleaning device that has a power plug) near the 
ignition key. Then, go to step 2.

NO :  Go to Step 3.

STEP 2. Retest the system
Check that the ignition key can be registered.
Q: Is the ignition key that cannot be registered using scan 

tool in good condition?
YES : The procedure is complete.
NO :  Go to Step 3.

STEP 3. Check which ignition key cannot be registered.
Q: Can any one of the ignition keys be registered?

YES (Only some keys) : Replace the key that cannot be 

registered and register the ID codes. (Refer to 

P.42C-10

. After registering the ID codes, go to Step 5.

NO (All keys) : Go to Step 4.

STEP 4. Retest the system
Check the scan tool screen when the key was not able to be 
registered.
Q: Is the error message of scan tool screen "Abnormality 

in key" ?
YES (Abnormality in key) : Carry out DTC B1A25: 

Transponder ID unmatched and DTC B1A35: 
Transponder read error. Refer to 

P.42C-28

 B1A25, 

P.42C-32

 B1A35. Then, go to Step 5. 

NO (ECU internal error) : Replace WCM and register the 

ID codes. (Refer to 

P.42C-10

. After registering the ID 

codes, go to Step 5.

STEP 5. Retest the system
Check that the ignition key can be registered.
Q: Is the ignition key cannot be registered using scan tool 

in good condition?
YES : The procedure is complete.
NO :  Replace WCM and register the ID codes. (Refer to 

P.42C-10

.)

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-84

Inspection Procedure 3: Engine does not start.

.

TECHNICAL DESCRIPTION (COMMENT)

If the fuel injection does not work, WCM and the MFI 
system may have a problem. This symptom is not 
considered abnormal when the engine is started by 
an ignition key that has not been registered.

.

TROUBLESHOOTING HINTS

• Malfunction of battery

• Malfunction of the MFI system

• Malfunction of WCM

• Malfunction of CAN bus line

• Malfunction of the transponder

• VIN not programmed

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. Check the battery voltage.
Measure the battery voltage when cranking.

• The voltage should measure 8 volt or more.

Q: Is the measured voltage 8 volt or more?

YES : Go to Step 2.
NO :  Check the battery. (Refer to GROUP 54A 

− Battery 

test 

P.54A-9

.)

STEP 2. Using scan tool MB991958, diagnose the CAN bus 
line.

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.42C-7

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO :  Repair the CAN bus line. (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-85

STEP 3. Using scan tool MB991958, read the 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-49

 <2.4L Engine> or GROUP 13B, 

Diagnosis 

P.13B-50

 <3.0L Engine>.)

NO :  Go to Step 4.

STEP 4. Using scan tool MB991958, read the 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-7

.)

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-49

 <2.4L 

Engine> or GROUP 13B, Diagnosis 

P.13B-50

 <3.0L 

Engine>. When the cause of the failure cannot be 
tracked down by the troubleshooting in GROUP 13A 
<2.4L Engine> or GROUP 13B <3.0L Engine>, 
replace WCM and register the ID codes. (Refer to 

P.42C-10

.)

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-86

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.

ACA02746

WCM Power Supply Circuit

34

FUSIBLE
LINK

36

FUSIBLE
LINK

IGNITION
SWITCH (IG1)

ETACS-
ECU

ID CODE

ENGINE
COMPARTMENT

IMMOBILIZER 
ANTENNA

KEYLESS
ENTRY
RECEIVER

TRANSPONDER

IG1
RELAY

RELAY BOX 

WCM

AB