DTC P0516 Battery Temperature Sensor Circuit Low: Notes

DTC DETECTING CONDITION: 

Immediately at fault recognition

WIRING DIAGRAM: 

• Engine Electrical System NON-TURBO MODEL (WITHOUT PUSH BUTTON START) Ref. to WIRING SYSTEM > Engine Electrical System >  NON-TURBO MODEL (WITHOUT PUSH BUTTON START)  .
• Engine Electrical System NON-TURBO MODEL (WITH PUSH BUTTON START) Ref. to WIRING SYSTEM > Engine Electrical System >  NON-TURBO MODEL (WITH PUSH BUTTON START)  .

Fig 1: Engine Electrical System Non-Turbo Model Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK CURRENT DATA  .
   1. Start the engine.
   2. Read the value of «Battery temperature» using the Subaru Select Monitor.
      NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to ENGINE (DIAGNOSTICS) (H4DO) >  Subaru Select Monitor   .

   Is the value of «Battery temperature» 100°C (212°F) or more?

   Yes: Go to   2  .

   No: Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2. CHECK HARNESS BETWEEN ECM AND BATTERY TEMPERATURE SENSOR CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connectors from the ECM and battery temperature sensor.
   3. Measure the resistance between ECM connector and chassis ground.

      Connector & terminal 

      (B137) No. 24 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes: Replace the battery temperature sensor. Ref. to STARTING/CHARGING SYSTEMS (H4DO) >  BATTERY CURRENT & TEMPERATURE SENSOR  .

   No: Repair the short circuit to ground in the harness between the ECM connector and battery temperature sensor connector.