DTC P081A: Starter Disable Circuit Low: Notes

WARNING: This page is about a different variant/trim than selected.

1. -

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Failure of engine to start

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

IMPREZA MODEL (WITHOUT PUSH BUTTON START)

G13614659

Courtesy of SUBARU OF AMERICA, INC.

G13614660

Courtesy of SUBARU OF AMERICA, INC.

CROSSTREK MODEL (WITHOUT PUSH BUTTON START)

G13614661

Courtesy of SUBARU OF AMERICA, INC.

G13614662

Courtesy of SUBARU OF AMERICA, INC.

IMPREZA MODEL (WITH PUSH BUTTON START)

G13614664

Courtesy of SUBARU OF AMERICA, INC.

G13614665

Courtesy of SUBARU OF AMERICA, INC.

CROSSTREK MODEL (WITH PUSH BUTTON START)

G13614666

Courtesy of SUBARU OF AMERICA, INC.

G13614667

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

CHECK HARNESS BETWEEN ECM AND M/B (STARTER CUT RELAY) (SHORT TO GROUND) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Remove the starter cut relay.
4. Measure the resistance between the ECM connector and engine ground.
Connector and terminal

(B134) No. 24 - Engine ground:

Is the resistance 1 MΩ or more?

Yes: Go to 2.

No: Repair the short circuit to ground in harness between ECM connector and M/B (starter cut relay).
CHECK HARNESS BETWEEN ECM AND M/B (STARTER CUT RELAY) (OPEN) .
Measure the resistance of harness between ECM connector and M/B (starter cut relay) terminal No. 4.

Connector and terminal

(B134) No. 24 - No. 4:

Is the resistance less than 1 Ω?

Yes: Go to 3.

No: Repair the open circuit of harness between ECM connector and M/B (starter cut relay) connector.
CHECK STARTER CUT RELAY .
Check the starter cut relay. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER RELAY>INSPECTION .

Is the check result OK?

Yes: Repair the poor contact of ECM connector.

No: Replace the starter cut relay. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER RELAY>LOCATION .