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Home >> Subaru >> 2021 >> Ascent Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (1 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0039: Turbocharger/Supercharger Bypass Valve "A" Control Circuit Range/Performance >> General Description >> Execution Condition
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Execution Condition

Secondary parameters Execution condition
Battery voltage 10.9 V or more
Barometric pressure 75.06 kPa (563.1 mmHg, 22.2 inHg) or more
Time when the air by-pass valve is open Less than 1750 ms
Actual boost pressure when air by-pass valve control status starts Open Value of Map1 or more
Accelerator pedal position 0%
Throttle position Value of Map2 or less
Target throttle position change amount of every 40 ms = Target throttle position - Target throttle position at 40 ms before 0.4 % or less (experienced)
Engine speed 1600 rpm or more
ENGINE SPEED DESCRIPTION - MAP 1

Engine speed (rpm) 1600 1800 2000 2400 2800 3000 3200 3600
Actual boost pressure when air by-pass valve control status starts Open (kPa (mmHg, inHg)) 120 (900.2, 35.4) 120 (900.2, 35.4) 120 (900.2, 35.4) 115 (862.7, 34) 110 (825.2, 32.5) 110 (825.2, 32.5) 110 (825.2, 32.5) 110 (825.2, 32.5)
Engine speed (rpm) 4000 4400 4800 5000 5200 5600 5900
Actual boost pressure when air by-pass valve control status starts Open (kPa (mmHg, inHg)) 110 (825.2, 32.5) 105 (787.7, 31) 95 (712.7, 28.1) 90 (675.2, 26.6) 90 (675.2, 26.6) 80 (600.2, 23.6) 80 (600.2, 23.6)
ENGINE SPEED DESCRIPTION - MAP 2

Engine speed (rpm) 1600 1800 2000 2400 2800 3000 3200 3600
Throttle position (%) 7.6 7.6 7.6 7.6 7.6 7.6 7.6 7.6
Engine speed (rpm) 4000 4400 4800 5000 5200 5600 5900
Throttle position (%) 7.6 7.6 7.6 8 8 8 8