Quote:
Originally Posted by XJ1100
....Does the fuel pump have to put out a certain amout of pressure in order to get an injector pulse?
Is there a common wire or connector problem that could cause a no pulse??
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Fuel pressure has no effect on injector pulse, there is no fuel pressure sensor. Ignition and injector pulse are both triggered by the crankshaft position sensor, therefore if you have ignition pulse, (spark at the coil), the PCM is receiving a signal from the crankshaft position sensor. The connector at the injector assembly would be a likely spot to look for a loose connection. If that's ok, trace the wiring back to the PCM. Check for battery voltage at the injector connector when it acts up. If that's ok, check for a pulsed ground while cranking. That will at least tell you what circuit is causing the problem.
The 3 pink wires should show battery voltage when the ignition is in the RUN and START positions. They are all fed from the ECM 1 15amp fuse in the underhood fuse panel.
The PCM provides pulsed ground to the other six wires, (each has a black stripe), when the engine is cranking and running.