For future searches, this would be the better way to test since checking continuity would be pointless anywhere except the ground wire
Quoted from gofer:
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Your CAS has four wires going to it, a 12v signal and ground the other two are signal wires for the TDC and CAM inputs to the ECU. To test them you'll have to pull the CAS off the head and turn it by hand, this will allow you to test the signals with a multimeter as you spin it. Both the CAM and TDC signal wires should read up to 5v as you spin the CAS, the CAM signal wire pulses 4 times per revolution and the TDC pulses 2 times.
Heres a pin out of the CAS connector going to the ECU so you can check continuity of the wires and know which wires to test for the CAM & TDC pulses.
ECU Pins to CAS connector Pins -
CAM Signal wire (YEL): Pin 2 at the CAS (4 pulses per revolution)
TDC signal wire (WHT): Pin 1 at the CAS (2 pulses per revolution)
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...And a little more random info on the CAS
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The DSM CAS has a total of four connections. The CAS is powered by a 12 volt source that is powered on with the ignition key and remains on during cranking. The 12v supply to your ecu is a perfect source for power to the CAS. The CAS ground should be connected directly to the ECU ground. The other two connections are for the cam and crank signals. These signals are floating outputs that are pulled to ground when the trigger disc allows light to pass through the optical sensor. In order for the CAS to work properly your ECU will need to provide a 5 volt pull-up on the cam and crank sensor inputs.
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