If this were me, the first thing I would do is go to the library and get a hold of a good manual and figure out how to diagnose this thing. This would contribute to poor performance. When this input is missing, then the computer either fires the spark plugs at the wrong time or not at all. 1) The crankshaft position sensor picks up crankshaft position and relays it to the ICM.Ģ) The ICM uses this to determine base timing and sends this information on to the EEC-IV computer.ģ) The EEC-IV computer uses this and other engine load parameters to determine timing advance and sends this information back to the ICMĪs I understand it, this code indicates that the input signal to the EEC-IV computer (steps 1 and 2) was erratic.
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