DTC P081A: Starter Disable Circuit Low: Notes

-
DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Failure of engine to start

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .
- Model without push button start
Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.
- Model with push button start
Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>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)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
1. 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 & 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).
2. 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.
  
  Connector & 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.
3. CHECK STARTER CUT RELAY .
  Check the starter cut relay. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>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)>STARTER RELAY>LOCATION .