Mitsubishi Galant. Manual — part 616

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-17

STEP 2. Check the immobilizer-ECU power supply circuit
by backprobing.
(1) Do not disconnect immobilizer-ECU connector C-89.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 7 and ground by

backprobing.

Q: Is the voltage approximately 12 volts (battery positive

voltage)?
YES : Go to Step 5.
NO : Go to Step 3.

STEP 3. Check immobilizer-ECU connector C-89 and MFI
relay connector A-21X for damage.
Q: Are immobilizer-ECU connector C-89 and MFI relay

connector A-21X damaged?
YES : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. Confirm that

scan tool MB991502 communicates normally.

NO : Go to Step 4.

ACX01728

AE

CONNECTOR: C-89

(HARNESS SIDE)

AC003128

CONNECTOR: A-21X

AO

MFI RELAY

BATTERY

AC002877AB

CONNECTOR: C-89

IMMOBILIZER-ECU

TSB Revision

CHASSIS ELECTRICAL

IGNITION SWITCH

54A-18

STEP 4. Check the harness wires between immobilizer-
ECU connector C-89 and MFI relay connector A-21X.
NOTE: After checking intermediate connector C-17,check the
wires. If intermediate connector C-17 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Are the harness wires between immobilizer-ECU

connector C-89 and MFI relay connector A-21X
damaged?
YES : Replace them. Confirm that scan tool MB991502

communicates normally.

NO : There is no action to be taken.

STEP 5. Check the immobilizer-ECU ground circuit by
backprobing.
(1) Do not disconnect immobilizer-ECU connector C-89.
(2) Measure the resistance between terminal 3 and ground by

backprobing.

Q: Is the resistance less than 2 ohms?

YES : Go to Step 7 .
NO : Go to Step 8 .

AC003128

CONNECTOR: A-21X

AO

MFI RELAY

BATTERY

AC002877AB

CONNECTOR: C-89

IMMOBILIZER-ECU

AC003089 AI

CONNECTOR: C-17

ACX01729AD

CONNECTOR: C-89
(HARNESS SIDE)

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-19

STEP 6. Check immobilizer-ECU connector C-89 for
damage.
Q: Is immobilizer-ECU connector C-89 in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Confirm that scan tool

MB991502 communicates normally.

STEP 7. Check the harness wire between immobilizer-ECU
connector C-89 and ground.
Q: Is the harness wire between immobilizer-ECU connector

C-89 and ground damaged?
YES : Repair it. Confirm that scan tool MB991502

communicates normally.

NO : There is no action to be taken.

STEP 8. Check the harness wires between immobilizer-
ECU connector C-89 and PCM connector C-42.
Q: Are the harness wires between immobilizer-ECU

connector C-89 and PCM connector C-42 damaged?
YES : Repair them. Confirm that scan tool MB991502

communicates normally.

NO : Go to Step 9.

AC002877AB

CONNECTOR: C-89

IMMOBILIZER-ECU

AC002877AB

CONNECTOR: C-89

IMMOBILIZER-ECU

AC003685

CONNECTOR: C-42

AB

PCM

AC002877AB

CONNECTOR: C-89

IMMOBILIZER-ECU

TSB Revision

CHASSIS ELECTRICAL

IGNITION SWITCH

54A-20

STEP 9. Replace the immobilizer-ECU or PCM.
Replace the immobilizer-ECU or PCM.

Q: Did the communication with MUT-II become possible

after replacing the immobilizer-ECU or the power train
control module?
YES : Register the password (secret code) and encrypted

code (Refer to

P.54A-23

.)Confirm that scan tool

MB991502 communicates normally

NO : Go to Step 10.

STEP 10.Recheck for malfunction

Q: Is a malfunction eliminated?

YES : This diagnosis is complete.(If no malfunction are not

found in all steps, an intermittent malfunction is
suspected.Refer to GROUP 00,How to Use
Troubleshooting/Inspection Service Points-How to
Cope with Intermittent Malfunction

P.00-8

.)

NO : Replace the immobilizer-ECU or PCM.

Inspection Procedure 2: The ignition key cannot be registered.

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

TROUBLESHOOTING HINTS

•

Malfunction of ignition key

•

Malfunction of immobilizer-ECU

DIAGNOSIS

Required Special Tools:

•

MB991223: Harness Set

•

MB991502: Scan Tool

STEP 1. Check the DTC 11.

Q: Does DTC11 reset?

YES : Refer to

P.54A-11

.

NO : Replace the ignition key that cannot be registered.

Then re-register the encrypted code. Check that the
ignition key can be registered. Then Go to Step 2.

STEP 2. Recheck for malfunction

Q: Is a malfunction eliminated?

YES : This diagnosis is complete.(If no malfunction are not

found in all steps, an intermittent malfunction is
suspected.Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points-How to
Cope with Intermittent Malfunction

P.00-8

.)

NO : Replace the immobilizer-ECU.