P1553 - FAULT CODE - OBD2

P1553 INFINITI, NISSAN: BATTERY CURRENT SENSOR PERFORMANCE

With the variable power generation voltage control, fuel consumption can be significantly decreased by reducing the engine load that is caused by generator power output. The Battery Current Sensor is installed on the battery negative terminal cable, whose basic function is to measure the battery charge/discharge current.

The information gathered by the Battery Current Sensor is sent to the ECM, which then determines whether or not variable power generation voltage control is required. In performing such control, the ECM can calculate the voltage based on the data received by the sensor, and this calculated value is provided as the power generation command value to IPDM E/R.

On Infiniti and Nissan vehicles, if the P1553 OBDII diagnostic code is set, it is because the ECM detected a performance problem from the Battery Current Sensor. This fault occurs when the signal voltage transmitted from the sensor to the ECM exceeds the maximum power generation amount.

• Check Engine lamp comes on.

The reasons why the P1553 OBD2 fault code is set are:

• The battery charge level may not be sufficient.
• The battery current sensor cables or connectors may be damaged.
• The starter system circuit may be faulty.
• The Battery Current Sensor may be in poor condition.
• The Camshaft Position Sensor may be faulty.

To troubleshoot the DTC P1553 OBDII code you must do the following:

• Check the TSBs.
• Check if other trouble codes are stored, which are related to ignition component failures. If so, diagnose those codes.
• Measure the battery voltage and consult the data source to verify if the battery voltage is adequate. If this value is found to be deficient, repairs are necessary.
• Verify that the battery current sensor wiring is not damaged. Likewise, check that the power, ground, and signal circuits are not open or shorted. Repair as required.
• Following the steps recommended by the manufacturer, check the Battery Current Sensor for good condition. If after performing these tests you detect sensor failure, proceed with the replacement.