Battery current sensor circuit

The battery current sensor installed on the positive (+) battery terminal detects the amount of current supplied from the generator.

The battery current sensor changes current to voltage (at the positive (+) battery terminal) and sends it to the ecm. The ecm controls the voltage of the generator based on the signals from the battery current sensor.

• If different dtcs that are related to a different system are output simultaneously while terminal e2 is used as a ground terminal, terminal e2 may be open.
• Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. 1
   Inspect battery current sensor assembly
2. 2
   Disconnect the b29 battery current sensor connector.
3. 3
   Measure the resistance of the battery current sensor.

Standard resistance

The resistance differs according to the tester type.

1. 1
   Check harness and connector (battery current sensor - ecm)
2. 2
   Disconnect the b29 battery current sensor connector.
3. 3
   Disconnect the b30 ecm connectors.
4. 4
   Measure the resistance of the wire harness side connectors.

Standard resistance (check for open)

Standard resistance (check for short)