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Home >> Lexus >> 2008 >> IS 250 RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (4GR-FSE) - System And Component Testing, On-Vehicle Inspection, Removal, Inspection & Installation >> Cold Start Injector Circuit >> Inspection Procedure
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Inspection Procedure

  1. INSPECT COLD START INJECTOR 
    1. Disconnect the E57 cold start injector connector.
    2. Measure the resistance according to the value (s) in the table below.

    Standard resistance 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    1 - 2 20°C (68°F) 11.6 to 12.6 Ω
    Fig 1: Identifying E57 Cold Start Injector Connector
    G05316623Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE COLD START INJECTOR 

    OK: Go to Next Step 

  2. INSPECT ECM (STJ1 VOLTAGE) 
    1. Turn the engine switch on (IG).
    2. Measure the voltage according to the value (s) in the table below.

    Standard voltage 

    VOLTAGE SPECIFICATION CHART

    Tester Connection Specified condition
    STJ1 (E3-7) - E1 (E4-7) 9 to 14 V
    Fig 2: Identifying ECM Connector E3 And E4
    G05316624Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

    NG: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (COLD START INJECTOR - ECM) 
    1. Disconnect the E57 cold start injector connector.
    2. Disconnect the E3 ECM connector.
    3. Measure the resistance according to the value (s) in the table below.

    Standard (Check for open) 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Specified condition
    E57-1 - STJ1 (E3-7) Below 1 Ω

    Standard (Check for short) 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Specified condition
    E57-1 or STJ1 (E3-7) - Body ground 10 kΩ or higher
    Fig 3: Identifying E57 Cold Start Injector Connector
    G05316625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK AND REPLACE HARNESS AND CONNECTOR (COLD START INJECTOR - BATTERY POSITIVE TERMINAL)