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EC-316 < COMPONENT DIAGNOSIS > [VK56DE] P1551, P1552 BATTERY CURRENT SENSOR P1551, P1552 BATTERY CURRENT SENSOR Component Description INFOID:0000000005149371 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 (1) is installed to the battery cable at the negative termi- nal. 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 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 . : Vehicle front CAUTION: Do not 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:0000000005149372 The MIL will not light up for these self-diagnoses. NOTE: If DTC P1551 or P1552 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-289, "On Board Diagnosis Logic" DTC Confirmation Procedure INFOID:0000000005149373 If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next step. Before performing the following procedure, confirm that battery voltage is more than 8 V with ignition switch ON 1. Turn ignition switch ON. 2. Wait at least 10 seconds. 3. Check 1st trip DTC. 4. If 1st trip DTC is detected, go to Diagnosis Procedure INFOID:0000000005149374 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. 2. Loosen and retighten ground screws on the body. BBIA0744E DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1551 Battery current sensor circuit An excessively low voltage from the sensor • Harness or connectors (The sensor circuit is open or shorted.) • Battery current sensor P1552 Battery current sensor circuit An excessively high voltage from the sensor |