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Subaru Legacy Service Manual: Dtc p0154 a/f / o2 sensor circuit no activity detected bank 2 sensor 1

Subaru Legacy Service Manual / Engine (diagnostics)(h6do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0154 a/f / o2 sensor circuit no activity detected 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) Disconnect the connectors from ECM and front oxygen (A/F) sensor.

3) Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector.

Connector & terminal

(E158) No. 45 — (E24) No. 3:

(E158) No. 44 — (E24) No. 4:

Is the resistance less than 1 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0154 A/F / O2 SENSOR CIRCUIT NO ACTIVITY DETECTED BANK 2 SENSOR 1

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit in harness between ECM connector and front oxygen (A/F) sensor connector

Poor contact of coupling connector

2.CHECK FOR POOR CONTACT.

Check for poor contact of ECM and front oxygen (A/F) sensor connector.

Is there poor contact of ECM or front oxygen (A/F) sensor connector-

Repair the poor contact of ECM or front oxygen (A/F) sensor connector.

Replace the front oxygen (A/F) sensor. Front Oxygen (A/F) Sensor

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0134. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0134 A/F / O2 SENSOR CIRCUIT NO ACTIVITY DETECTED BANK 1 SENSOR 1

Dtc p0157 o2 sensor circuit low voltage 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 p0152 a/f / o2 sensor circuit high voltage 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:

Inspection
1. Check that the front oxygen (A/F) sensor has no deformation, cracks or other damages.2. Measure the resistance between front oxygen (A/F) sensor terminals.Terminal No.Standard3 and 42.0+0.42 −0.2 - (when 20°C (68°F)) ...

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