2020 Subaru Forester P code Page 5

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously after warming up when the engine speed increases and AVCS operates.

5. DIAGNOSTIC METHOD

1. When the conditions during which the differences of AVCS target timing advance amount and AVCS actual timing advance amount is

large continues for certain amount of time.

2. When the differences of target timing advance amount and actual timing advance amount is calculated during AVCS control, and the

difference per predetermined time is the specified value or larger.

Abnormality Judgment

Judge as NG when the following conditions are established within the predetermined time.

Time Needed for Diagnosis: 30000 ms

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

Normality Judgment

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

Time Needed for Diagnosis: 30000 ms

P0030

DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)

1. OUTLINE OF DIAGNOSIS

Detect functional errors of the front oxygen (A/F) sensor heater.

Judge as NG when it is determined that the front oxygen (A/F) sensor impedance is large when looking at engine status such as deceleration

fuel cut.

2. COMPONENT DESCRIPTION