Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0052 a/f / o2 heater control circuit high bank 2 sensor 1

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h6do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0052 a/f / o2 heater control circuit high bank 2 sensor 1

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

WIRING DIAGRAM:

• Engine Electrical System ENGINE TYPE EZ (WITHOUT PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

• Engine Electrical System ENGINE TYPE EZ (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 1) Turn the ignition switch to OFF. 2) Measure the voltage between ECM connector and chassis ground. Connector & terminal (E158) No. 4 (+) — Chassis ground (−):	Is the voltage 10 V or more-	Repair the short circuit to power in the harness between ECM connector and front oxygen (A/F) sensor connector.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0052 A/F / O2 HEATER CONTROL CIRCUIT HIGH BANK 2 SENSOR 1
2.CHECK GROUND CIRCUIT FOR ECM. 1) Disconnect the connector from ECM. 2) Measure the resistance between ECM connector and chassis ground. Connector & terminal (E158) No. 60 — Chassis ground: (E158) No. 61 — Chassis ground: (E158) No. 62 — Chassis ground: (E158) No. 63 — Chassis ground: (E158) No. 64 — Chassis ground: (E158) No. 65 — Chassis ground:	Is the resistance less than 5 --	Repair the poor contact of ECM connector.	Repair the open circuit in harness between ECM connector and engine ground.

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0032. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0032 A/F / O2 HEATER CONTROL CIRCUIT HIGH BANK 1 SENSOR 1

Dtc p0057 a/f / o2 heater control circuit low bank 2 sensor 2

DTC DETECTING CONDITION:Detected when two consecutive driving cycles with fault occur.CAUTION:After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and I ...

Dtc p0051 a/f / o2 heater control circuit low bank 2 sensor 1

DTC DETECTING CONDITION:Immediately at fault recognitionCAUTION:After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mod ...

Other materials:

Removal
1. Disconnect the ground terminal from battery sensor. NOTE2. Remove the air intake duct. Air Intake Duct > REMOVAL3. Disconnect the connector (A) from the mass air flow and intake air temperature sensor, and remove the clip (B) from the air cleaner case (rear).4. Loosen the clamp (A) securing the ...