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How to Repair the Low Coolant Level Fault in BYD Tang DM?

1 Answers

SanJosie

07/30/25 8:59am

Repair Process: 1. Upon arrival at the shop, there were no fault symptoms present. The VDS diagnostic tool was connected, and no fault codes were detected during the vehicle scan. According to the circuit diagram, the coolant level signal is transmitted to the instrument panel via the GJB05 connector. To minimize vehicle disassembly steps, a segmented measurement approach was adopted. The B26 connector showed no pin retraction and was properly connected. Measurements confirmed good grounding for B26-1, and continuity was verified between B26-3 and BJG05-10. 2. During the inspection of the BJG05 connector, water stains were found at the connector beneath the right A-pillar, and the GJB05 connector pins were corroded. After treating the connector and drying the water stains, a test drive confirmed the fault was resolved. Repair Summary: 1. For intermittent faults, it is essential to combine the circuit diagram and control principles to aim for a one-time fault resolution. 2. For new energy vehicles, when encountering low coolant levels, it is also necessary to consider issues related to the coolant sensor signals involving the battery pack and motor controller.

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