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EC-420 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P1553 BATTERY CURRENT SENSOR P1553 BATTERY CURRENT SENSOR Description INFOID:0000000010095114 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 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 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 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. DTC Logic INFOID:0000000010095115 DTC DETECTION LOGIC NOTE: If DTC P1553 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 8 V at idle. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and wait at least 10 seconds. 2. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010095116 Regarding Wiring Diagram information, refer to . 1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E9. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1553 Battery current sensor perfor- The signal voltage transmitted from the • Harness or connectors (The sensor circuit is open or shorted.) • Battery current sensor |