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Home >> Subaru >> 2019 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System >> Meter & Gauge System >> DTC B1509: Ambient Air Temperature Sensor Open Detection >> Inspection steps

Inspection steps

  1. Reading of SSM4 data (ambient temperature input value)
    1. On the SSM4, navigate to the [Data monitor] display, and check the computer data. (Refer to DATA MONITOR/ACTIVE TEST )

    Criteria

    SSM4 screen: [Each System] →[Combination Meter] →[Data monitor]

    Item name [Item symbol] Description of item/display item Normal value Remarks
    [Ambient Temperature]
    [Ambi Temp]    		 Ambient air temperature is displayed.
    Display range: -40 to 87.5°C {-40 to 189.5°F}    		  
    • In open circuit: (-40°C (-40°F)) is displayed.
    • In short-circuit: (87.5°C (189.5°F)) is displayed.
    		 Thermistor ASSY system
    RESULT DESCRIPTION

    Result Go to
    The same value as the ambient temperature sensor is displayed (during the inspection according to the list of diagnostic codes) A
    The same value as the ambient temperature sensor is displayed (during the inspection according to the symptom table) B
    The displayed value is not the same as the ambient temperature sensor C

    A: Go to next step

    B: Perform the circuit test shown on the symptom table.

    (Refer to SYMPTOM TABLE )

    C: Go to Step 3.

  2. Checking diagnostic codes
    1. Clear the diagnostic code using the SSM4. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    2. Using SSM4, check the diagnostic code again. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )

    Criteria: No DTC output

    NG: Replacement of the combination meter ASSY (Refer to REMOVAL )

    OK: Go to next step

    Complete

  3. Unit inspection of thermistor ASSY
    1. Remove the thermistor ASSY. (Refer to COOLER THERMISTOR (AMBIENT SENSOR) )
    2. Inspect the individual thermistor ASSY. (Refer to UNIT INSPECTION )

    NG: Replacement of thermistor ASSY (Refer to COOLER THERMISTOR (AMBIENT SENSOR) )

    OK: Go to next step

  4. Inspection of wire harness and connector (thermistor ASSY - combination meter ASSY)
    NOTE: For inspection procedures and precautions, Refer to SYMPTOM TABLE .
    1. Disconnect connector D7 of the combination meter ASSY.
    2. Measure the resistance between the terminals. (For terminal arrangement, Refer to ECM TERMINAL ARRANGEMENT .)
    STANDARD VALUE SPECIFICATION - RESISTANCE (OPEN CIRCUIT CHECK)

    Inspection terminals (Terminal symbol) Inspection conditions Standard value
    A48-1 - D7-24(TAM) Always Less than 1 Ω
    A48-2 - D7-25(SG-) Always Less than 1 Ω
    STANDARD VALUE SPECIFICATION - RESISTANCE (SHORT CIRCUIT CHECK)

    Inspection terminals Inspection conditions Standard value
    A48-1 - Chassis ground Always 10 kΩ or more
    A48-2 - Chassis ground Always 10 kΩ or more

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

    Replacement of the combination meter ASSY (Refer to REMOVAL )

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