Mitsubishi Galant. Manual — part 615

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-13

STEP 5. Check immobilizer-ECU connector C-89 and
ignition key ring antenna connector C-59 for damage.
Q: Are immobilizer-ECU connector C-89 and ignition key

ring antenna connector C-59 in good condition?
YES : Go to Step 6.
NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. Confirm that

diagnostic trouble code 11 is not output.

STEP 6. Check the harness wires between immobilizer-
ECU connector C-89 and ignition key ring antenna
connector C-59.
Q: Are the harness wires between immobilizer-ECU

connector C-89 and ignition key ring antenna connector
C-59 in good condition?
YES : Replace the immobilizer-ECU. Then register the

password (secret code) and encrypted code (Refer to

P.54A-23

.) Confirm that diagnostic trouble code 11 is

not output.

NO : Repair them. Confirm that diagnostic trouble code 11

is not output.

AC002877AB

CONNECTOR: C-89

IMMOBILIZER-ECU

AC002878

COLUMN SWITCH

CONNECTOR: C-59

AB

AC002877AB

CONNECTOR: C-89

IMMOBILIZER-ECU

AC002878

COLUMN SWITCH

CONNECTOR: C-59

AB

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CHASSIS ELECTRICAL

IGNITION SWITCH

54A-14

DTC12: Encrypted codes are not the same or not registered

DTC SET CONDITION
The encrypted code which is sent from the
transponder is not the same as the encrypted code
which is registered in the immobilizer-ECU.

NOTE: DTC 12 is always output together with MFI
system DTC P1610.

TROUBLESHOOTING HINTS

•

The encrypted code in the ignition key being used
has not been properly registered

•

Malfunction of immobilizer-ECU

DIAGNOSIS

STEP 1. Check that the encrypted code was registered.

Q: Was the encrypted code registered?

YES : Replace the immobilizer and then re-register the

encrypted code (Refer to

P.54A-23

.)

NO : Register the encrypted code (Refer to

P.54A-23

.)

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-15

SYMPTOM PROCEDURES

Inspection Procedure 1: Communication with scan tool MB991502 is impossible.

AC003969AB

Immobilizer-ECU Power Supply, Ground and PCM Communication Line Circuit

AC003128

CONNECTOR: A-21X

AO

MFI RELAY

BATTERY

AC002877AB

CONNECTOR: C-89

IMMOBILIZER-ECU

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CHASSIS ELECTRICAL

IGNITION SWITCH

54A-16

CIRCUIT OPERATION
Immobilizer-ECU is energized when the ignition
switch is turned "ON," and the MFI relay is turned on.
The PCM transmits a signal from scan tool
MB991502 to the immobilizer-ECU as it is. In the
same way, a signal from the immobilizer-ECU is also
transmitted to scan tool MB991502 as it is.

TECHNICAL DESCRIPTION (COMMENT)

•

This malfunction may be caused by a defective
immobilizer-ECU or PCM, or a defect in the
communication line between the immobilizer-
ECU and PCM. If this malfunction appears when
the MFI system and scan tool MB991502 can
communicate each other, MFI system DTC
P1610 will reset.

•

If the MFI system is normal, the MFI relay can be
determined as normal. In addition, if the MFI
system and scan tool MB991502 can
communicate each other, the circuits between the
data link connector and the PCM can determined
as normal.

NOTE: If this malfunction appears, MFI system
DTC P1610 will be output.

TROUBLESHOOTING HINTS

•

Malfunction of immobilizer-ECU

•

Malfunction of PCM

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

•

MB991223: Harness Set

•

MB991502: Scan Tool (MUT-II)

STEP 1. Check that scan tool MB991502 can communicate
with the MFI system and that the MFI system DTC other
than P1610 resets.

Q: Can scan tool MB991502 communicate with the MFI

system? Does MFI system DTC other than P1610 reset?
YES : Go to Step 2 .
NO : Refer to GROUP 13A, Diagnosis

P.13A-5

or GROUP

13B, Diagnosis

P.13B-4

.

AC003089 AI

CONNECTOR: C-17

AC003685

CONNECTOR: C-42

AB

PCM

AC002883

16PIN

MB991502

AB