Friday, August 9, 2019

2020 Subaru Forester P code Page 42

Time Needed for Diagnosis: 1 time(s)

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

Normality Judgment

1. Regardless of a deceleration fuel cut, if the response time (diagnosis value) when the oxygen sensor voltage has changed from rich to lean

is shorter than the threshold value (judgment value), judge as a normal condition.

Response time (diagnosis value) less than or equal to Threshold value -> Normal

2. Do not judge as a normal condition.

Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis: 1 time(s)

6. ENABLE CONDITION

Lean -> rich response diagnosis

7. GENERAL DRIVING CYCLE

Perform diagnosis once during deceleration fuel cut from a constant and high speed driving, when rear oxygen sensor is warmed up

sufficiently. (Pay attention to the oxygen sensor voltage for the timing of the deceleration.)

8. DIAGNOSTIC METHOD

When the oxygen sensor output voltage changes from 0.25 V (lean) to 0.55 V (rich), calculate the minimum response time for output change

between 0.3 V and 0.5 V for the judgment criteria.

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