DTC P065A: Generator/Alternator System Performance: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Charge warning light illuminates.

Failure detection pattern: 

• "Primary" (high-priority diagnosis)

Warning light/indicator light: 

• Malfunction indicator light -

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM>2.0 L MODEL .

Courtesy of SUBARU OF AMERICA, INC.

1. BASIC INSPECTION  .

   Before performing the diagnosis, perform basic inspection. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>GENERAL DESCRIPTION>INSPECTION .

   NOTE:

   • Check the battery and its installation condition.
   • Check the related fuse.
   • Visually check that the related connectors are properly connected.

     Also, check the related ground terminal for looseness and corrosion.

   Is the check result OK?

   Yes  : GO TO  2.

   No  : Repair the defective part.

   After the repair, GO TO  6.

2. CHECK V-BELT  .

   Check the V-belt. Ref. to MECHANICAL (H4DO)>V-BELT>INSPECTION .

   Is the check result OK?

   Yes  : GO TO  3.

   No  : Repair the defective part.

   After the repair, GO TO  6.

3. CHECK HARNESS (OPEN CIRCUIT IN GENERATOR POWER SUPPLY LINE)  .
   1. Turn the ignition switch to OFF.
   2. Measure the resistance between the following terminals.

      Connector & terminal: Standard 

      Generator terminal B - Battery positive terminal: Less than 1 Ω

   Is the check result OK?

   Yes  : GO TO  4.

   No  : Repair the defective part.

   After the repair, GO TO  6.

4. CHECK HARNESS (OPEN CIRCUIT IN GENERATOR GROUND WIRE)  .

   Measure the resistance between the following terminals.

   Connector & terminal: Standard 

   Generator main body - Chassis ground: Less than 1 Ω

   Is the check result OK?

   Yes  : GO TO  5.

   No  : Repair the defective part.

   After the repair, GO TO  6.

5. CHECK DATA MONITOR  .
   1. Connect all connectors and terminals.
   2. Start the engine, and let it idle for 30 seconds or more with the headlights turned on.
   3. Using the Subaru Select Monitor, read [Alternator Mechanical Error Status] and [Alternator Electrical Output Error Status].
      NOTE: For detailed operation procedures, refer to "COMMON (DIAGNOSTICS)". Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR .

      Standard: 

      Generator mechanical malfunction status: OFF

      Generator electrical malfunction status: OFF

   Is the check result OK?

   Yes  : Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) .

   After replacement, GO TO  6.

   No  : Replace the generator. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>GENERATOR .

   After replacement, GO TO  6.

6. CHECK REPAIR  .
   1. Perform the inspection mode corresponding to DTC. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>INSPECTION MODE>PROCEDURE .
   2. Confirm that DTC or cancel code is not stored and the malfunction is eliminated.

   Is the check result OK?

   Yes  : Finish the diagnosis.

   No  : Perform the diagnosis according to the basic diagnostic procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .