The Bosch M7 ECU has a common failure, the water
temperature sensor ground connection is prone to burn off the circuit, the
failure is result from two main reasons: 1. the water temperature sensor is
damaged; 2. the water temperature sensor electric circuit short circuited. Repair
the water temperature sensor electric circuit, then open the M7 ECU, There are
two PINs for ground connection, use a electric wire connect the ground pin to
centre to solve this problems
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