Battery Current Sensor: Description and Operation

BATTERY CURRENT SENSOR




Component Description
The power generation voltage variable control enables fuel consumption to be decreased by reducing the engine load which is caused by the power generation of the generator. The battery current sensor (1) is installed to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the battery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is performed. When performing the power generation voltage variable control, ECM calculates the target power generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation command value to IPDM E/R. For the details of the power generation voltage variable control, refer to Starting and Charging.

CAUTION: Do not connect the electrical component or the ground wire directly to the battery terminal. The connection causes the malfunction of the power generation voltage variable control, and then the battery discharge may occur.

Component Inspection

BATTERY CURRENT SENSOR
1. Reconnect harness connectors disconnected.




2. Disconnect battery negative cable (1).
: <- : To body ground

3. Install jumper cable (A) between battery negative terminal and body ground.
4. Turn ignition switch ON.




5. Check voltage between ECM terminal 71 (battery current sensor signal) and ground.

Voltage: Approximately 2.5 V

6. If NG, replace battery negative cable assembly.