DTC P058B: Battery Monitor Module Current Monitoring Performance: Notes

DTC detecting condition: 

Immediately at fault recognition

Failure detection pattern: 

• "Primary" (high-priority diagnosis)

Warning light/indicator light: 

• Malfunction indicator light

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  4.

2. CHECK DTC  .
   1. Turn the ignition switch to ON. (Engine OFF)
   2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC P058A displayed? (Current code or history code)

   Yes  : Check for DTC P058A. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P058A BATTERY MONITOR MODULE PERFORMANCE .

   No  : GO TO  3.

3. CHECK FREEZE FRAME DATA  .

   Using the Subaru Select Monitor, read the values in [Battery Terminal Voltage], [Battery Charge/Discharge Current] and [Estimated Battery Temperature].

   NOTE: For detailed operation procedures, refer to "COMMON (DIAGNOSTICS)". Ref. to COMMON (DIAGNOSTICS)>FREEZE FRAME DATA .

   Is [Battery Terminal Voltage] 14.3 V, is [Battery Charge/Discharge Current] 0 A, and is [Estimated Battery Temperature] 20°C (68°F)? (Check the value that is before confirming malfunction)

   NOTE: If it is fixed to the failsafe value ([Battery Terminal Voltage]: 14.3 V, [Battery Charge/Discharge Current]: 0 A, [Estimated Battery Temperature]: 20°C (68°F)) before confirming malfunction, it can be judged that DTC was detected due to malfunction occurrence during self-diagnosis of the battery sensor. Therefore, check P058A.

   Yes  : Check for DTC P058A. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P058A BATTERY MONITOR MODULE PERFORMANCE .

   No  : Replace the battery sensor. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>BATTERY SENSOR .

   After replacement, GO TO  4.

4. 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 .