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P0A1F-123 HBB-37 < COMPONENT DIAGNOSIS > D E F G H I J K L M A B HBB N O P COMPONENT DIAGNOSIS P0A1F-123 Description INFOID:0000000004212249 The hybrid vehicle control ECU alerts the driver and performs fail safe control based on error signals sent from the battery smart unit. DTC Logic INFOID:0000000004212250 DTC DETECTION LOGIC If the battery smart unit detects an internal malfunction in the unit itself, the hybrid vehicle control ECU will illu- minate the MIL and set a DTC. Diagnosis Procedure INFOID:0000000004212251 1. PRECONDITIONING • Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-volt- age system. • After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. • Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly. • After completing repairs, restart the system [turn ignition switch ON (READY)] and recheck for DTCs. >> GO TO 2. 2. CHECK AUXILIARY BATTERY 1. Turn ignition switch OFF. 2. Measure the voltage between the terminals of the auxiliary battery. OK or NG OK >> GO TO 3. NG >> Charge or replace auxiliary battery. 3. CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE) CAUTION: Be sure to wear insulated gloves. 1. Remove the service plug grip (Refer to HBB-92, "Precautions for Inspecting the Hybrid Control System" ). 2. Remove the battery smart unit (Refer to HBB-101, "Removal and Installation" ). NOTE: Do not disconnect the battery smart unit harness connectors. 3. Disconnect battery smart unit harness connector B130. 4. Turn ignition switch ON. DTC No. INF code Trouble diagnosis name DTC detecting condition Possible cause P0A1F 123 Battery energy control module Reception of an error signal from • Battery smart unit Standard voltage: 11 to 14 V |