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System Operation Check

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Trouble shooting of an engine immobilizer system complaint begins with verification of the customer problem. Perform Problem Analysis Check (Engine Immobilizer System). See Fig 1.
  2. Inspect the communication function of the large-scale body multiplex communication system (BEAN). Check that there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system. See MULTIPLEX COMMUNICATION SYSTEM under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
    • (ECU communication stop, communication line abnormal) With code outputs, go to step  3.
    • (ECU communication stop, communication line abnormal) Without code outputs, go to the appropriate article for each system.
  3. Preform pre-check. See PRE-CHECK  under SELF-DIAGNOSTIC SYSTEM. Connect the OBD II scan tool or hand-held tester to the DLC3. DLC3 is located under the left side of the instrument panel. See Figure. Check for DTC(s) and note if a code is output. Delete the DTC. Check if the DTC will be output once again, when the problem symptom is simulated based on the noted code.
    • When no code is output (symptom check and simulation possible), go to  4.
    • When no code is output (symptom check and simulation impossible), go to TROUBLE SHOOTING SYMPTOMS .
    • When a code is output, go to step  6.
    TROUBLE SHOOTING SYMPTOMS

    Symptom Suspected Area
    Engine Does Not Start Key (1) & (2) , Transponder Key Amplifier (2) & (3) , ECM (2) & (3) Or Wiring Harness (4)
    (1) See DTC B2795: UNMATCHED KEY CODE  under DIAGNOSTIC TESTS.
    (2) See DTC B2796: NO COMMUNICATION IN IMMOBILIZER SYSTEM & DTC B2798: COMMUNICATION MALFUNCTION NO. 2  under DIAGNOSTIC TESTS.
    (3) See DTC B2797: COMMUNICATION MALFUNCTION NO. 1  under DIAGNOSTIC TESTS.
    (4) Check for open or short circuits in wiring. See WIRING DIAGRAMS .
  4. Determine symptom. See TROUBLE SHOOTING SYMPTOMS .
    • Without applicable symptoms, go to step  5.
    • With applicable symptoms, go to step  6.
  5. Perform trouble shooting in the following method, depending on the malfunction symptom.
  6. Make necessary adjustments, repairs or replacements.
Fig 1: Customer Problem Analysis Check (Engine Immobilizer System)
G00173736Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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