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Home >> Subaru >> 2015 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) (STI) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P050A Cold Start Idle Air Control System Performance >> Diagnostic Method

Diagnostic Method

Judge as NG when the following conditions are established.

Judgment Value 

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Actual engine speed - Target engine speed < Value of Map 4

Map 4 

TEMPERATURE RESISTANCE SPECIFICATION - MAP 4

Engine coolant temperature -40 °C (-40 °F) -30 °C (-22 °F) -20 °C (-4 °F) -10 °C (14 °F) 0 °C (32 °F) 10 °C (50 °F) 20 °C (68 °F) 30 °C (86 °F) 40 °C (104 °F) 50 °C (122 °F) 60 °C (140 °F)
Threshold Value -150 rpm -150 rpm -150 rpm -150 rpm -150 rpm -150 rpm -300 rpm -300 rpm -300 rpm -300 rpm -300 rpm

Time Needed for Diagnosis:  7000 ms

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

Judge as NG when the following conditions are established.

Judgment Value 

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Final ignition timing - ignition timing during CSERS(1) > Value of Map 5
(1) Ignition timing during CSERS (Cold Start Emission Reduction Strategy) = Base ignition timing - retard amount

Map 5 

TEMPERATURE RESISTANCE SPECIFICATION - MAP 5

Engine coolant temperature -40 °C (-40 °F) -30 °C (-22 °F) -20 °C (-4 °F) -10 °C (14 °F) 0 °C (32 °F) 10 °C (50 °F) 20 °C (68 °F) 30 °C (86 °F) 40 °C (104 °F) 50 °C (122 °F) 60 °C (140 °F)
Threshold Value 6 °CA 6 °CA 6 °CA 6 °CA 6 °CA 6 °CA 6 °CA 6 °CA 6 °CA 6 °CA 6 °CA

Time Needed for Diagnosis:  7000 ms

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.