Mitsubishi Galant (2004+). Manual - part 1446

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-27

STEP 9. Check the wiring harness between 
immobilizer-ECU connector C-124 (terminal 3) and PCM 
connector B-19 (terminal 13).

NOTE: Also check intermediate connector C-29 ,check the 
wires. If intermediate connector C-29 is damaged, repair or 
replace them. Refer to GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

Q: Are the wiring harness between immobilizer-ECU 

connector C-124 (terminal 3) and PCM connector B-19 
(terminal 13) in good condition?
YES : Go to Step 10.
NO :  Repair the wiring harness. Confirm that scan tool 

MB991958 communicates normally.

AC305229AE

CONNECTOR: B-19

HARNESS SIDE

B-19 (B)

AC305232

CONNECTORS: C-29, C-124

C-29

C-124

C-29

C-124

HARNESS SIDE

AV

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-28

STEP 10. Replace the immobilizer-ECU or PCM.

Replace the immobilizer-ECU or PCM.
Q: Did the communication with the scan tool become 

possible after replacing the immobilizer-ECU or the 
PCM?
YES : Register the password (secret code) and encrypted 

code 

P.54A-40

.

NO :  Replace the PCM. Then register the password (secret 

code) and encrypted code (Refer to 

P.54A-40

).

INSPECTION PROCEDURE 2: The Ignition Key cannot be Registered.

.

TECHNICAL DESCRIPTION (COMMENT)
The ignition key transponder or the immobilizer-ECU 
is suspected to be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the ignition key

• Malfunction of immobilizer-ECU 

.

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness A (Vehicles with CAN 

communication system)

STEP 1. Using scan tool MB991958, read the diagnostic 
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool.
 Use scan tool MB991958 to check if DTC 11 is set.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch "ON" position.
(3) Read the immobilizer system diagnostic trouble code.
Q: Does DTC11 reset?

YES : Refer to 

P.54A-14

.

NO :  Replace the ignition key that cannot be registered. 

Then go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-29

STEP 2. Retest the system.

Register the ignition key.
Q: Does registered ignition key function properly?

YES : The procedure is complete.
NO :  Replace the immobilizer-ECU.

INSPECTION PROCEDURE 3: Engine Cranks, but does not Start.

.

TECHNICAL DESCRIPTION
If the engine cranks, but does not start, an MFI sys-
tem problem may exist in addition to a malfunctioning 
immobilizer system. The engine will not start if the 
ignition key has not been properly registered.

.

TROUBLESHOOTING HINTS

• Malfunction of MFI system

• Malfunction of immobilizer-ECU 

.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness A (Vehicles with CAN 

communication system)

STEP 1. Check the battery voltage.

Measure the battery voltage during cranking.
Q: Is the voltage 8 volts or more?

YES : Go to Step 2.
NO :  Check the condition of the battery. Refer to 

P.54A-5

.

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-30

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch "ON" position.
(3) Read the diagnosis code.
Q: Have any DTCs set?

Yes :  Refer to 

P.54A-13

.

No :  Go to Step 3.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827