Monday, July 8, 2019

2020 Subaru Forester P code Page 164

3. GENERAL DRIVING CYCLE

Perform continuous diagnosis when air flow amount is large during the secondary air pump stop after engine start.

4. DIAGNOSTIC METHOD

When both combination valve electromagnetic valve and the reed valve are open failure, the failure appears as pulses in the secondary air

delivery pipe pressure sensor output. Detect abnormality by capturing these pulses using the following method.

Abnormality Judgment

Calculate Max./Min. value of the secondary air delivery pipe pressure sensor output voltage and the sum of the output voltage deviation for

the given time. Compare the difference between Max. and Min. values with threshold value and also compare the sum value with the

threshold value. If both values exceed the threshold value, count up NG counter and then judge as NG if the counter reaches the given times.

Time Needed for Diagnosis: 2000 ms x 20 time(s)

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear NG if neither exceeds the threshold value, or if either of the two exceeds the threshold value.

Time Needed for Diagnosis: 2000 ms

P1418

DTC P1418 SECONDARY AIR INJECTION SYSTEM CONTROL "A" CIRCUIT SHORTED

1. OUTLINE OF DIAGNOSIS

Judge as NG when the ECM output level differs from the actual terminal level.

2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

Abnormality Judgment

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

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