Mitsubishi Outlander GS45X. Manual - part 1178

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-79

STEP 1. 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 2.
NO :  Repair the CAN bus line. (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

STEP 2. Using scan tool MB991958, read the other system 
diagnostic trouble code.
Check if DTC is set to the ETACS-ECU or engine control mod-
ule.
Q: Is the DTC set?

YES (DTC is set to ETACS-ECU.) : Troubleshoot the 

ETACS. (Refer to GROUP 54A, Diagnosis 

P.54A-733

.)

YES (DTC is set to the engine control module.) : 

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 3.

STEP 3. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.

OK: 8637A213

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Replace ETACS-ECU.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-80

STEP 4. Check part number of WCM
Check the part number of WCM.

OK: MN141352

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Replace WCM and register the ID codes. (Refer to 

P.42C-10

.)

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1) Erase the DTC.
(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 : Replace WCM and register the ID codes. (Refer to 

P.42C-10

.)

NO :  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

).

TROUBLE SYMPTOM CHART

M1427500400448

CAUTION

During diagnosis, a DTC associated with other system may be set when the ignition switch is turned 
on with connector(s) disconnected. On completion, check all systems for DTC(s). If DTC(s) are set, 
erase them all.

Trouble symptom

Inspection 
procedure 
number

Reference 
page

Scan tool cannot communicate with WCM.

1

P.42C-81

The ignition key cannot be registered using scan tool.

2

P.42C-82

Engine does not start.

3

P.42C-84

Abnormality in WCM power supply and ground circuits.

4

P.42C-86

Keyless entry system does not work.

5

P.42C-89

The dome light and the turn-signal lights and the horn do not operate through 
the answerback function.

6

P.42C-92

The timer lock function does not work after the doors have been unlocked by 
the keyless entry system.

7

P.42C-95

Power door locks with selective unlocking does not work.

8

P.42C-96

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-81

SYMPTOM PROCEDURES

Inspection Procedure 1: Scan tool cannot communicate with WCM.

CAUTION

Before replacing the ECU, ensure that the com-
munication circuit is normal.

.

TECHNICAL DESCRIPTION (COMMENT)

If the scan tool cannot communicate with the WCM, 
the CAN bus lines may be defective. If the WCM 
does not work, the WCM or the power supply circuit 
may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the power supply or ground of 

WCM

• Malfunction of CAN bus line

• Malfunction of WCM

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, 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 2.
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-82

STEP 2. Check the power supply circuit and the ground 
circuit to WCM.
Refer to Inspection Procedure 4 "Abnormality in WCM power 
supply and ground circuits." 

P.42C-86

.

Q: Are the power supply circuit and the ground circuit to 

WCM in good condition ?
YES : Go to Step 3.
NO :  Repair the power supply circuit and the ground circuit 

to WCM.

STEP 3. Retest the system
Check if scan tool can communicate with WCM.
Q: Does the scan tool cannot communicate with WCM 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-10

.)

Inspection Procedure 2: The ignition key cannot be registered using scan tool.

.

TECHNICAL DESCRIPTION (COMMENT)

If only some ignition keys cannot be registered, the 
ignition key itself may be faulty. If no ignition key can 
be registered, the key assembly may have already 
been registered for another vehicle, or the WCM may 
be faulty.

.

TROUBLESHOOTING HINTS

• Malfunction of the ignition key

• Damaged wiring harness and connectors

• Malfunction of WCM

• Ignition key registered for other vehicle

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)