Code No. P0515: Battery Temperature Sensor System <Vehicles for Thailand>

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 JUDGEMENT

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.

Judgement 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.