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Fig. 17: Identifying Connector C
-310
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Are immobilizer-ECU connector C-39 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.
STEP 6. Check the wiring harness between immobilizer-ECU connector
C-39 (terminal 7 and 8) and key reminder switch connector C-310
(terminal 7 and 3).
2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Ignition Switch - Endeavor
Page 2546 of 3870
Fig. 18: Identifying Connector C
-39
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Ignition Switch - Endeavor
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Fig. 19: Identifying Connector C310
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Are the wiring harness between immobilizer-ECU connector C-39
(terminal 7 and 8) and key reminder switch connector C-312 (terminal 7
and 3) in good condition?
YES: Replace the immobilizer-ECU and then register the password
(secret code) and encrypted code (Refer to ON
-VEHICLE SERVICE
).
Retest the system.
NO: Repair or replace the damaged component(s). Confirm that scan tool
MB991958 communicates normally.
DTC 12: ENCRYPTED CODES ARE NOT THE SAME OR NOT REGISTERED DTC SET CONDITION The encr
ypted code sent b
y the trans
ponder is not the same encr
ypted code which is
2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Ignition Switch - Endeavor
Page 2548 of 3870
registered in the immobilizer-ECU. 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 ON
-VEHICLE SERVICE
).
NO: Register the encrypted code (Refer to ON
-VEHICLE SERVICE
).
SYMPTOM CHART NOTE: DTC 12 is always output together with MFI system DTC
P0513.
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.
2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Ignition Switch - Endeavor
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Fig. 20: Symptom Chart
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
SYMPTOM PROCEDURES INSPECTION PROCEDURE 1: COMMUNICATION WITH SCAN TOOL MB991958 IS IMPOSSIBLE. < UP TO
DECEMBER 2003 >
2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Ignition Switch - Endeavor
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Fig. 21: Immobilizer
-ECU Power Supply Ground and PCM Communication
Line Circuit Diagram & Connector Identification
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Ignition Switch - Endeavor
Page 2551 of 3870

Fig. 22: Identifying Connectors
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
CIRCUIT OPERATION The Immobilizer-ECU is energized by the MFI relay when the ignition switch is
turned "ON". The PCM transmits a signal from scan tool MB991958 to the
immobilizer-ECU as it is. In the same way, a signal from the immobilizer-ECU is
also transmitted to scan tool MB991958 as it is. TECHNICAL DESCRIPTION (COMMENT)
This malfunction may be caused by a defective immobilizer-ECU, 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 MB991958 can
communicate each other, MFI system DTC P0513 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 MB991958 can communicate each
other, the circuits between the data link connecto
r and the PCM can determined
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2004 BODY & ACCESSORIES Ignition Switch - Endeavor
Page 2552 of 3870
as normal.
TROUBLESHOOTING HINTS
Malfunction of the immobilizer-ECU Malfunction of the PCM The wiring harness or connectors may have loose, corroded, or damaged
terminals, or terminals pushed back in the connector
DIAGNOSIS 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)
MB991223: Harness Set
STEP 1. Using scan toll MB991958, read the MFI system diagnostic
trouble code.
Use scan tool MB991958 to confirm the MFI system DTC.
1. Connect scan tool MB991958 to the data link connec
tor.
NOTE: If this malfunction appears, MFI system DTC P0513 will
be set.
CAUTION: To prevent damage to scan tool MB991958,
always turn the ignition switch to "LOCK" (OFF)
position before connecting or disconnecting
scan tool.
2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Ignition Switch - Endeavor