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Subaru Crosstrek Service Manual: Dtc p081a starter disable circuit low

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 Electrical System">

STEPCHECKYESNO

1.CHECK HARNESS BETWEEN STARTER RELAY (PUSH BUTTON START) CONNECTOR AND STARTER CUT RELAY CONNECTOR.

1) Turn the ignition to OFF.

2) Remove the starter relay (push button start).

3) Remove the starter cut relay.

4) Measure the resistance of harness between starter relay (push button start) connector and starter cut relay connector.

Connector & terminal

(B225) No. 28 — (B225) No. 42:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P081A STARTER DISABLE CIRCUIT LOW">Go to Step 2.

Repair the open circuit in harness between starter relay (push button start) connector and starter cut relay connector.

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

(B135) No. 34 — (B225) No. 40:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P081A STARTER DISABLE CIRCUIT LOW">Go to Step 3.

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. 40 and No. 42.

2) Measure the resistance between starter cut relay terminals.

Terminals

No. 41 — No. 44:

Is the resistance 1 M? or more?

Repair the poor contact of ECM connector.

Replace the starter cut relay. Starter Cut Relay">

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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