Subaru Legacy BN/BS (2015-2019) Service Manual: General diagnostic table inspection

Diagnostic trouble code

DTC is displayed when inspecting all DTCs.

Perform the diagnosis according to DTC.

System is normal.

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Speedometer

Faster vehicle speed than the actual speed is displayed.

VDC CM data may not be received.

System is normal.

Also, check vehicle speed pulse circuit.

Fuel gauge

Fuel is present, but displayed less than actual amount.

Communication error may be present.

System is normal.

Also, check the fuel gauge.

Fuel level warning light

Fuel is present, but the light illuminates.

Communication error may be present.

System is normal.

Also, check the fuel gauge.

Engine coolant temperature light

Engine coolant temperature light blinks in red and blue alternately.

Communication error may be present.

System is normal.

Check the engine coolant light related items.

[S], [I] or [S#] indicator

Blinking.

Communication error may be present.

System is normal.

Check the intelligent switch.

VDC indicator

Illuminating.

Communication error may be present.

System is normal.

Check that VDC is not operating.

VDC OFF indicator

Illuminating.

Communication error may be present.

System is normal.

Check that VDC is not OFF.

Brake warning, etc.

Illuminating.

Brake fluid may be low in amount, or communication error may be present.

System is normal.

Check brake related items.

Shift position

Not displayed.

Communication error may be present.

System is normal.

Also, check AT system.

AT temperature light

Blinking.

Communication error may be present.

System is normal.

Also, check AT system.

Door indicator

Not displayed.

Communication error may be present.

System is normal.

Check the door switch.

Clearance indicator

Not illuminating.

Communication error may be present.

System is normal.

Check the combination switch.

Hi beam indicator

Not illuminating.

Communication error may be present.

System is normal.

Check the combination switch.

Front fog indicator

Not illuminating.

Communication error may be present.

System is normal.

Check the combination switch.

Illumination

Illuminating at the maximum brightness.

Communication error may be present.

System is normal.

Also, check the illumination switch.

Cruise control indicator

Not illuminating.

Communication error may be present.

System is normal.

Check the cruise control system.

AWD indicator

Not illuminating.

Communication error may be present.

System is normal.

Check TCM.

Hill hold indicator

Not illuminating.

Communication error may be present.

System is normal.

Also, check VDC CM.