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Home >> Subaru >> 2019 >> Ascent Touring >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P050A: Cold Start Idle Control System Performance >> Diagnostic Method
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Diagnostic Method

<Idle speed diagnosis>

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value DTC
Actual engine speed - Target engine speed Less than -300 RPM P050A

<Final ignition timing diagnosis: Idle>

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value DTC
Final ignition timing - Ignition timing during CSERS*
*: Ignition timing during CSERS (Cold Start Emission Reduction Strategy) = Base ignition timing - Retard amount
More than 8.5° CA P050A

<Final ignition timing diagnosis: Non-idle> 

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value DTC
Final ignition timing - Ignition timing during CSERS*
*: Ignition timing during CSERS (Cold Start Emission Reduction Strategy) = Base ignition timing - Retard amount
More than 8.5° CA P050B

Time needed for diagnosis:  7000 ms

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.