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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 50 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P2431 Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance >> Diagnostic Method

Diagnostic Method

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If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE

Malfunction Criteria Threshold Value
|Secondary air pipe pressure - Intake manifold pressure| ≥ 26.7 kPa (200 mmHg, 7.9 inHg)
|Intake manifold pressure at engine start - Intake manifold pressure| < 1.3 kPa (9.99 mmHg, 0.4 inHg)

Time Needed for Diagnosis:  328 ms

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

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

JUDGMENT VALUE

Malfunction Criteria Threshold Value
|Secondary air pipe pressure - Intake manifold pressure| < 26.7 kPa (200 mmHg, 7.9 inHg)

Time Needed for Diagnosis:  262 ms