Bosch PCE Coolant Pumps
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Connector part Number: 4F0 973 703[1]
Pump can be run without the signal (S) pin connected. This will operate the pump at maximum speed. There is a 2 second startup delay if the pump is to be operated without the signal (S) pin connected.
If the pump detects that it is being run dry, it will turn itself off, try again, but will quit if unsuccessful >20 times
Signal pin can be provided a 12v PWM to control the speed[2]