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:

Caution
1. Never connect the battery in reverse polarity.• Doing so may immediately damage the A/C CM.2. Do not disconnect the battery terminals while the engine is running.• A large counter electromotive force will be generated in the generator, and this voltage may damage electronic parts such ...