Mitsubishi Galant 9G. Manual — part 1534
IGNITION SWITCH
TSB Revision
CHASSIS ELECTRICAL
54A-8
• Using scan tool MB991958 (MUT-III Sub Assem-
• By operating two ignition keys that have been
.
OPERATION
1. When the ignition switch is turned to "ON"
position, the PCM sends a requirement for the
encrypted code to the immobilizer-ECU (at this
time, the engine is remobilized).
2. When the immobilizer-ECU receives the
requirement from the PCM, the immobilizer-ECU
supplies power to the transponder inside the
ignition key via the antenna. The energized
transponder sends the encrypted code back to the
immobilizer-ECU via the antenna.
3. The immobilizer-ECU judges the encrypted code
with its code logic in itself. If they are identical, the
immobilizer-ECU sends the encrypted code to the
PCM.
4. If the PCM cannot receive the encrypted code, the
engine will be immobilized.
CAUTION WHEN REPLACING IMMOBILIZER SYSTEM RELATED PARTS
To replace immobilizer system related parts, refer to the table below. When the ignition key is re-registered
with scan tool MB991958, the originally registered ignition key registration information will be lost.
AC306415AB
TRANS-
PONDER
POWER
(WIRELESS)
ENCRYPTED
CODE (WIRELESS)
MUT-III
POWERTRAIN
CONTROL
MODULE
CONTROL
SIGNAL
IGNITION
KEY RING
ANTENNA
IMMOBILIZER-
ECU
ITEMS
PCM
IMMOBILIZER-ECU
IGNITION KEY
When replacing PCM
-
Replacement is not
required
Replacement is not required.
All ignition keys re-registration
are required.
When rewriting PCM
-
Replacement is not
required
Replacement is not required.
Re-registration is not required.
When replacing
immobilizer-ECU
Replacement not
required
-
Replacement is not required.
All ignition keys re-registration
are required.
When adding ignition keys
newly (if registered ignition
keys are not lost)
Replacement not
required
Replacement is not
required
Register only additional ignition
keys to be registered.
When adding ignition key
newly (if registered ignition
keys are lost)
Replacement not
required
Replacement is not
required
Register ignition key to be
added and re-register all other
ignition keys.
When ignition key is lost
Replacement not
required
Replacement is not
required
Re-register all other ignition
keys except the lost one.
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-9
IGNITION KEY REMINDER TONE ALARM
AND DOOR LOCK PREVENTION FUNCTION
DIAGNOSIS
M1543000701046
The Ignition key reminder tone alarms and door lock
prevention function are controlled by the Simplified
Wiring System (SWS). For troubleshooting, refer to
GROUP 54B, SWS Diagnosis
IMMOBILIZER SYSTEM DIAGNOSIS
INTRODUCTION TO IMMOBILIZER SYSTEM
DIAGNOSIS
M1543009901326
CAUTION
The encrypted code should always be re-regis-
tered when replacing the immobilizer-ECU.
The immobilizer system consists of the immobi-
lizer-ECU, PCM, ignition key and ignition key ring
antenna. If the engine cannot be started by using a
registered ignition key, one of these components
may be defective. If the immobilizer system has
immobilized the engine, MFI system DTC P0513 will
be output. In this case, observe the immobilizer sys-
tem troubleshooting.
IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1543006900841
Use the following steps to plan your diagnostic strat-
egy.
1. Gather information about the problem from the
customer.
2. Verify that the condition as described by the
customer exists.
3. Check the vehicle for any immobilizer system
DTCs.
4. If you cannot verify the condition and there are no
immobilizer system DTCs, the malfunction is
intermittent. Refer to GROUP 00, How to Use
Troubleshooting/inspection Service Points
− How
to Cope with Intermittent Malfunctions
.
5. If you can verify the condition but there are no
immobilizer system DTCs, or the system cannot
communicate with scan tool MB991958, refer to
Symptom Chart and find the fault
6. If there is an immobilizer system DTC, record the
DTC, then erase it from the memory using scan
tool MB991958.
7. Recreate the immobilizer system DTC set
conditions to see if the same immobilizer system
DTC will resets.
(1) If the same immobilizer system DTC resets,
perform the appropriate diagnostic procedure.
Refer to Diagnostic Trouble Code Chart
(2) If the same immobilizer system DTC does not
reset, the malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/inspection Service Points
−
How to Cope with Intermittent Malfunctions
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-10
DIAGNOSIS FUNCTION
M1543007000443
HOW TO CONNECT SCAN TOOL (MUT-III)
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
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. Ensure that the ignition switch is at the "LOCK" (OFF)
position.
2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824
and the personal computer.
4. Connect special tool MB991910 to special tool MB991824.
5. Connect special tool MB991910 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON"
position.
NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator light will be illuminated in a green
color.
7. Start the MUT-III system on the personal computer.
NOTE: Disconnecting the scan tool MB991958 is the
reverse of the connecting sequence, making sure that the
ignition switch is at the "LOCK" (OFF) position.
HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
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.
NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does not
display.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-11
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "IMMOBILIZER" from the "POWER TRAIN" tab.
6. Select "Self-diagnosis."
7. If a DTC is set, it is shown.
8. Choose "Erase DTCs" to erase the DTC.
HOW TO READ DATA LIST
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
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 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "IMMOBILIZER" from the "POWER TRAIN" tab.
6. Select "Data List."
7. Choose an appropriate item and select the "OK" button.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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