P0517

FA20 BATTERY / CHARGING: CHARGING SYSTEM: P0516, P0517; Battery Temperature Sensor Circuit Low; 2013 MY FR-S [03/2012 -]
P0516 - Battery Temperature Sensor Circuit Low
P0517 - Battery Temperature Sensor Circuit High

DESCRIPTION

The battery temperature sensor installed on the battery current sensor assembly detects the battery temperature.

A thermistor is integrated into the battery temperature sensor, and the resistance in the battery temperature sensor changes according to the battery temperature.

The resistance of the thermistor in the battery temperature sensor decreases as the battery temperature increases. The resistance increases as the temperature decreases.

The battery temperature sensor is connected to the ECM. The ECM supplies 5 V from the THB terminal to the battery temperature sensor through resistor R.

The battery temperature sensor and resistor R are connected in series. This results in fluctuations in the voltage supplied from the THB terminal when the resistance changes according to the battery temperature.

The ECM determines the battery temperature according to fluctuations in voltage. When the battery temperature is high, the ECM determines to reduce the amount of current supplied from the generator in order to protect the battery.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT BATTERY CURRENT SENSOR ASSEMBLY

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the A11 battery current sensor assembly connector.

(d) Reconnect the cable to the negative (-) battery terminal.

NG -- REPLACE BATTERY CURRENT SENSOR ASSEMBLY Removal
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (BATTERY CURRENT SENSOR ASSEMBLY - ECM)

(a) Disconnect the A33 and A35 ECM connectors.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal