Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p081a starter disable circuit low

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p081a starter disable circuit low

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

Failure of engine to start

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 FB (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK HARNESS BETWEEN F/B STARTER RELAY (PUSH BUTTON START) CONNECTOR AND STARTER CUT RELAY CONNECTOR. 1) Turn the ignition to OFF. 2) Remove the F/B starter relay and starter cut relay. 3) Measure the resistance of harness between F/B starter relay connector and starter cut relay connector. Connector & terminal (B220) No. 18 — (i137) No. 8:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P081A STARTER DISABLE CIRCUIT LOW	Repair the open circuit of harness. • Open circuit of harness between F/B starter relay connector and starter cut relay connector • Blown out of fuse (F/B No. 1)
2.CHECK HARNESS BETWEEN ECM AND STARTER CUT RELAY CONNECTOR. 1) Disconnect the connector from ECM. 2) Measure the resistance of harness between ECM connector and starter cut relay connector. Connector & terminal (B134) No. 62 — (B158) No. 2:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P081A STARTER DISABLE CIRCUIT LOW	Repair the open circuit of harness between ECM connector and starter cut relay connector.
3.CHECK STARTER CUT RELAY. 1) Connect the battery to starter cut relay terminals No. 17 and No. 19. 2) Measure the resistance between starter cut relay terminals. Terminals No. 18 — No. 21:	Is the resistance 1 M- or more-	Repair the poor contact of ECM connector.	Replace the starter cut relay. Relay and Fuse

1. OUTLINE OF DIAGNOSIS

Detect abnormal continuity in the starter cut relay.

Judge as NG when the starter cut relay output line is open.

2. EXECUTION CONDITION

Secondary Parameters	Execution condition
Battery voltage	≥ 8 V
Engine speed	Increase from 0 rpm to 500 rpm or more
Vehicle speed	< 1 km/h (0.6 MPH)
Starter cut relay command	OFF

3. GENERAL DRIVING CYCLE

Perform the diagnosis only once after the enable conditions have been established.

4. DIAGNOSTIC METHOD

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria	Threshold Value
Starter cut relay control voltage that exceeds battery voltage - 0.34	Not detected

Time Needed for Diagnosis: Less than 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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