124 OBD
9.0 IMMOBILISER
Toyota vehicles use two different types of Immobiliser ECUs:
• OBD Codes
• Multiplex-OBD (M-OBD)
The diagnostic functions available vary between the different ECU types. The connector
used for diagnosis can provide a clue as to the type of ECU the vehicle has.
• OBD ECUs are diagnosed using either the CHECK or TDCL.
• M-OBD ECUs are diagnosed using the DLC3.
The diagnostic test modes for each ECU type are described separately. See Section 9.1:
OBD Immobiliser Codes, and Section 9.2: M-OBD Immobiliser with Key Code Utility.
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