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P1554 BATTERY CURRENT SENSOR EC-1283 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE FOR MEXICO] C D E F G H I J K L M A EC N P O P1554 BATTERY CURRENT SENSOR Component Description INFOID:0000000009481947 The power generation voltage variable control enables fuel con- sumption to be decreased by reducing the engine load which is caused by the power generation of the generator. The battery cur- rent sensor is installed to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the bat- tery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is performed. When per- forming the power generation voltage variable control, ECM calcu- lates the target power generation voltage based on the sensor signal. And ECM sends the calculated value as the power genera- tion command value to IPDM E/R. For the details of the power gen- eration voltage variable control, refer to . CAUTION: Never connect the electrical component or the ground wire directly to the battery terminal. The con- nection causes the malfunction of the power generation voltage variable control, and then the battery discharge may occur. On Board Diagnosis Logic INFOID:0000000009481948 The MIL will not illuminate for this diagnosis. NOTE: If DTC P1554 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to . Overall Function Check INFOID:0000000009481949 Use this procedure to check the overall function of the battery current sensor circuit. During this check, a 1st trip DTC might not be confirmed. TESTING CONDITION: • Before performing the following procedure, confirm that battery voltage is more than 12.8V at idle. • Before performing the following procedure, confirm that all load switches and A/C switch are turned OFF. WITH CONSULT 1. Start engine and let it idle. “BAT CUR SEN” should be above 2,300mV at least once. 4. If NG, go to EC-1284, "Diagnosis Procedure" . WITH GST 1. Start engine and let it idle. BBIA0582E DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1554 Battery current sensor perfor- The output voltage of the battery current • Harness or connectors (The sensor circuit is open or shorted.) • Battery current sensor |