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Old 11-11-2021, 03:25 PM   #14
142 guy
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Join Date: May 2014
Location: Saskatchewan, Canada

While you are test cranking, at the CAS use a voltmeter connected between the cam output and ground to confirm that the cam signal is working. You should see the voltage transition from 5 volts to close to 0 volts and back to 5 volts as the cam window passes through the sensor module. If the signal is present at the sensor check at the MS box terminal to make sure that you don't have a 'field wiring' problem. If the cam signal is getting to the board I can't really help you with your board wiring as I am using the older through hole board and both my cam and tach inputs use opto isolator inputs which are ground switched by the CAS so no dedicated pull up resistors.
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