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Re: 83 Ur-Q - No Spark
> This is the good news. The bad news is that everything they have
> so far appears fine other than one of the Reference sensors. I have =
> also suggested that they check the current input "15" at the back of
> fuse box which has given problems before.
You need both the reference sensors working to get the ur-q going. One
is the reference mark sensor and on the ur-q flywheel marks approx 60
degree BTDC and the ECU uses this guy the begin the timing/spark cycle.
The other counts flywheel teeth so it knows where it is relative to the
ref mark sensor.