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E C - 3 7 4 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] P1551, P1552 BATTERY CURRENT SENSOR P1551, P1552 BATTERY CURRENT SENSOR DTC Logic INFOID:0000000009429301 DTC DETECTION LOGIC NOTE: If DTC P1551 or P1552 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 turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 8V with ignition switch ON >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch ON wait at least 10 seconds. 2. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000009429302 1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E15. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 2. CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT 1. Disconnect battery current sensor harness connector. 2. Turn ignition switch ON. 3. Check the voltage between battery current sensor harness connector and ground. Is the inspection result normal? YES >> GO TO 3. NO >> Repair open circuit or sort to ground or short to power in harness or connectors. 3. CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. DTC No. Trouble diagnosis content DTC detecting condition Possible cause P1551 Battery current sensor circuit An excessively low voltage from the sen- • Harness or connectors (The sensor circuit is open or shorted.) • Battery current sensor P1552 Battery current sensor circuit An excessively high voltage from the sen- Battery current sensor Ground Voltage Connector Terminal F9 1 Ground Approx. 5V |