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Home >> Subaru >> 2018 >> Impreza Base, 4D Sedan, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (P0171 To P0685) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P050A: Cold Start Idle Control System Performance >> Diagnostic Method
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Diagnostic Method

Judge as NG when the following conditions are established.

MALFUNCTION CRITERIA DESCRIPTION

Malfunction Criteria Threshold Value DTC
Actual engine speed - Target engine speed Less than -230rpm P050A

Time needed for diagnosis:  7000ms

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

Judge as NG when the following conditions are established.

MALFUNCTION CRITERIA DESCRIPTION

Malfunction Criteria Threshold Value DTC
Final ignition timing - ignition timing during CSERS*
*:
  • CSERS (Cold Start Emission Reduction Strategy)
  • Intermediate ignition timing = Base ignition timing - Retard amount
More than value of Map 5 P050B
ENGINE COOLANT TEMPERATURE SPECIFICATIONS

Engine coolant temperature at engine starting °C (°F) -40(-40) -30(-22) -20(-4) -10(14) 0(32) 10(50) 20(68) 30(86) 40(104) 50(122) 60(140)
Threshold value (CVT model) (°CA) 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5
Threshold value (MT model) (°CA) 7 7 7 7 7 7 7 7 7 7 7

Time needed for diagnosis:  7000ms

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