Code No. P0515: Battery Temperature Sensor System


FUNCTION



  • The battery temperature sensor is incorporated into the battery current sensor and it informs the engine-ECU of battery temperature via the Local Interconnect Network (LIN).
  • In response to the signal, the engine-ECU controls charging and discharging.

TROUBLE JUDGMENT


Check Condition
  • After 2 seconds since the ignition switch is turned ON or since the completion of engine start.
  • Battery positive voltage is more than 10 V and is less than 16.5 V.
Judgment Criterion
  • For 2 seconds, the battery temperature information from battery temperature sensor is abnormal.

FAIL-SAFE AND BACKUP FUNCTION



  • Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)

PROBABLE CAUSES



  • Failed battery temperature sensor
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is diagnosis code set?
Go to Step 2.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 2. Replace the battery current sensor

  • After replacing the battery current sensor, reconfirm whether the diagnosis code is set.

Q. Is the diagnosis code set?
Replace the engine-ECU.
Check end.