Mitsubishi Galant (2004+). Manual — part 1443
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-15
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
STEP 1. Check for presence of other key near the key in
the ignition.
Q: Is there any other key near the key in the ignition?
YES : Move the other key well away from key being used.
Retest the system.
NO : Go to Step 2.
STEP 2. Check that the engine start using the spare
ignition key which encrypted code has been registered.
Q: Does the engine start using the spare ignition key for
which the encrypted code has been registered?
YES : Replace the ignition key that does not work. Then
register the password (secret code) and encrypted
code
. Retest the system.
NO : Go to Step 3.
STEP 3. Recheck for diagnosis trouble code.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Use scan tool MB991958 to check immobilizer system
diagnostic trouble codes.
(4) Turn the ignition switch to "LOCK"(OFF) position.
(5) Disconnect scan tool MB991958.
Q: Which DTC is output, DTC 11 or 12?
DTC12 is output : Refer to DTC 12
DTC11 is output : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-16
STEP 4. Check the ignition key ring antenna.
(1) Disconnect the key reminder switch connector C-310.
(2) Measure the resistance value between terminal number 3
and terminal number 7 by backprobing.
• The measured value should be 2 ohm or less.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the ignition key ring antenna. Retest the
system.
STEP 5. Check Immobilizer-ECU connector C-124 and key
reminder switch connector C-310 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are immobilizer-ECU connector C-124 and key reminder
switch connector C-310 in good condition?
YES : Go to Step 6.
NO : Repair or replace the damage component(s). Confirm
that scan tool MB991958 communicates normally.
AC305235AF
CONNECTOR: C-310
HARNESS SIDE
AC209364
CONNECTOR C-310
(HARNESS SIDE)
JP
AC305231CQ
CONNECTOR: C-124
HARNESS SIDE
AC305235AF
CONNECTOR: C-310
HARNESS SIDE
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-17
STEP 6. Check the wiring harness between
immobilizer-ECU connector C-124 (terminal 7 and 8) and
key reminder switch connector C-310 (terminal 7 and 3).
Q: Are the wiring harness between immobilizer-ECU
connector C-124 (terminal 7 and 8) and key reminder
switch connector C-310 (terminal 7 and 3) in good
condition?
YES : Replace the immobilizer-ECU and then register the
password (secret code) and encrypted code (Refer to
). Retest the system.
NO : Repair or replace the damaged component(s).
Confirm that scan tool MB991958 communicates
normally.
DTC12: Encrypted Codes are Not the Same or Not Registered.
.
DTC SET CONDITION
The encrypted code sent by the transponder is not
the same encrypted code which is registered in the
immobilizer-ECU.
NOTE: DTC 12 is always output together with MFI
system DTC P0513.
.
TROUBLESHOOTING HINTS
• The encrypted code in the ignition key has not
been properly registered
• Malfunction of immobilizer-ECU.
.
DIAGNOSIS
Was the encrypted code registered?
YES : Replace the immobilizer-ECU and then re-register the
encrypted code (Refer to
NO : Register the encrypted code (Refer to
AC305231CQ
CONNECTOR: C-124
HARNESS SIDE
AC305235AF
CONNECTOR: C-310
HARNESS SIDE
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-18
SYMPTOM CHART
M1543007201105
CAUTION
During diagnosis, a DTC code associated with
other system may be set when the ignition switch
is turned on with connector(s) disconnected. On
completion, confirm all systems for DTC code(s).
If DTC code(s) are set, erase them all.
SYMPTOM
INSPECTION
PROCEDURE NO.
REFERENCE PAGE
Communication with scan tool MB991958 is impossible.
1
The ignition key cannot be registered.
2
Engine cranks, but does not start.
3
The immobilizer indicator light does not illuminate.
4
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