Battery Current Sensor: Description and Operation

Description

Vehicles have many control units that consume electricity. These units control their own system based on information from a variety of sensors. It is important to have a stable power supply to assure the various sensors provide accurate information. Battery sensor (A) is mounted on battery (-) terminal. It transmits battery voltage, current, temperature information to ECM. ECM controls generating voltage by duty cycle based on these signals.





CAUTION:
When battery sensor signal fault occurs, inspect that the parasitic draw is not abnormal more than 100mA as it will cause the sensor voltage to be abnormal.

NOTE:
It takes a few hours for a new battery sensor to detect the battery state correctly.
Perform the following process after replacing the battery sensor.
1. Ignition switch ON/OFF.
2. Park the vehicle about 4 hours.
3. After 4 hours later, check that the SOC (State of charge) of battery is displayed on GDS properly.

CAUTION:
For the vehicle equipped with a battery sensor, be careful not to damage the battery sensor when the battery is replaced or recharged.
- When replacing the battery, it should be same (type, capacity and brand) as originally installed on your vehicle. If a battery of a different type is installed, the battery sensor may recognize the battery to be abnormal.
- When installing the ground cable on the negative post of battery, tighten the clamp with specified torque of 3.9 - 5.9N.m (0.4 - 0.6kgf.m, 3.0 - 4.4lb-ft). An excessive tightening torque can damage the PCB internal circuit and the battery terminal.
- When recharging the battery, ground the negative terminal of the booster battery to the vehicle body.