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It has been tested with GM , Marelli and Renault type 4 wire stepper motors but should work with virtually any standard automotive 4 wire idle stepper motor.
This PWM2Stepper module has been designed by classifuelinjection in the UK and built in the UK by a professional electronics assembly company.
Pin 1 = Coil 1 Positive .
Pin 2 = Coil 1 Negative .
Pin 3 = Coil 2 Positive .
Pin 4 = Coil 2 Negative .
Pin 5 = PWM Input .
Pin 7 = +12V (from ignition key) .
Pin 12 = GND .