Troubleshooting Troubleshooting DTC of AVAS DTC of battery cooling control unit 4.3-3 DTC DTC description Possible causes Recommended countermeasures U3003 Low voltage Low battery voltage Too low battery voltage, please check battery U3003 High voltage High battery voltage Too high battery voltage, please check battery B2800 Working current abnormal Internal fault of control unit Check the acoustic alerting control unit. Trouble code DTC Description Fault causes Recommended countermeasures U3003 High power voltage 1. Battery voltage abnormal 2. BCU collection abnormal Check the wire harness or replace the BCU. U3003 Low power voltage 1. Battery voltage abnormal 2.
BCU collection abnormal Check the wire harness or replace the BCU. B2700 High pressure sensor open 1. Sensor open 2. Collection circuit abnormal 1) Check the wire harness and the sensor; 2) Replace the BCU. B2700 High pressure sensor short 1. Sensor open 2. Collection circuit abnormal 1) Check the wire harness and the sensor; 2) Replace the BCU. B2701 Low pressure sensor open 1. Sensor open 2. Collection circuit abnormal 1) Check the wire harness and the sensor; 2) Replace the BCU. B2701 Low pressure sensor short 1. Sensor open 2. Collection circuit abnormal 1) Check the wire harness and the sensor; 2) Replace the BCU. B2702 Low pressure side temperature sensor open 1. Sensor open 2.
Collection circuit abnormal 1) Check the wire harness and the sensor; 2) Replace the BCU. B2702 Low pressure side temperature sensor short 1. Sensor open 2. Collection circuit abnormal 1) Check the wire harness and the sensor; 2) Replace the BCU. B2703 PTC water outlet temperature sensor open Sensor short or open 1) Check the wire harness and the sensor; 2) Replace the BCU. B2703 PTC water outlet temperature sensor short Sensor short or open 1) Check the wire harness and the sensor; 2) Replace the BCU. B2704 Solenoid valve open Sensor short or open 1) Check the wire harness and the sensor; 2) Replace the BCU.
B2704 Solenoid valve short Sensor short or open 1) Check the wire harness and the sensor; 2) Replace the BCU. B2705 Electromagnetic expansion valve (EXV) overpressure 1. Battery voltage abnormal 2. BCU collection abnormal Check the wire harness or the EXV. B2705 Electromagnetic expansion valve (EXV) underpressure 1. Battery voltage abnormal 2. BCU collection abnormal Check the wire harness or the EXV. B2706 Water pump failed Internal fault of water pump 1. Inspect the line. 2. Inspect the pipeline. 3. Inspect the w ater pump status. B2707 PTC failed Internal fault of PTC 1. Inspect the circuit to see if the PTC can heat normally; 2. Professional personnel carry out overhaul.
B2708 Protection of high system pressure High system pressure 1. Test the circuit. 2. Verify the pressure. 3. Condenser has poor heat dissipation. 4. Professional personnel carry out service.