Engine Immobiliser System (For 4Gr-Fse) Diagnosis System

Securities. Lexus Is250, Is220D. Gse20 Ale20
Engine Immobiliser. Lexus Is250, Is220D. Gse20 Ale20

  1. DESCRIPTION

  1. CHECK DLC3

  1. INSPECT BATTERY VOLTAGE

Engine Immobiliser System (For 4Gr-Fse) -- Diagnosis System



DESCRIPTION

  1. Engine immobiliser system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle's Data Link Connector 3 (DLC3). In some cases, a malfunction may be occurring in the immobiliser system even though the security indicator is not illuminated. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform repairs.


CHECK DLC3


    Lexus Is250, Is220D. Gse20 Ale20.Engine Immobiliser.Engine Immobiliser System (For 2Ad-Fhv).Engine Immobiliser System (For 4Gr-Fse) Diagnosis System

  1. The vehicle uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

    Symbols (Terminals No.)
    		Terminal Description
    		Condition
    		Specified Condition
    SIL (7) - SG (5)
    		Bus "+" line
    		During transmission
    		Pulse generation
    BAT (16) - Body ground
    		Battery positive
    		Always
    		10 to 14 V
    CG (4) - Body ground
    		Chassis ground
    		Always
    		Below 1 Ω
    SG (5) - Body ground
    		Signal ground
    		Always
    		Below 1 Ω
    1. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
    HINT:
    Connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the screen displays a communication error message, there is a problem either with the vehicle or with the tester.
    1. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
    2. If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.

INSPECT BATTERY VOLTAGE

  1. Measure the battery voltage.

    Standard voltage:
    11 to 14 V
    If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.