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Subaru Legacy Service Manual: 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

STEPCHECKYESNO

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:

Drive cycle procedure
It is possible to complete diagnosis of the DTC by performing the indicated drive cycle. After the repair for the DTC, perform a necessary drive cycle and make sure the function recovers and the DTC is recorded.1. PREPARATION FOR DRIVE CYCLE1. Check that the battery voltage is 12 V or more and fuel ...

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