Endeavor V6-3.8L SOHC (2004)
Immobilizer-ECU Power Supply, Ground And PCM Communication Line Circuit Part 2
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)
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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.
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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 connector and the PCM can determined as normal.
NOTE: If this malfunction appears, MFI system DTC P0513 will be set.
TROUBLESHOOTING HINTS
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Malfunction of the immobilizer-ECU
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Malfunction of the PCM
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The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
Required Special Tools:
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MB991958: Scan Tool (MUT-III Sub Assembly)
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MB991824: Vehicle Communication Interface (V.C.I.)
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MB991827: MUT-III USB Cable
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MB991910: MUT-III Main Harness A (Vehicles with CAN communication system)
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MB991223: Harness Set
STEP 1. Using scan toll MB991958, read the MFI system diagnostic trouble code.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to "LOCK" (OFF) position before connecting or
disconnecting scan tool.
Use scan tool MB991958 to confirm the MFI system DTC.
