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Crank position sensor. Either the connection is bad or the sensor it bad is my opinion. Unfortunately it's not so easy to get to. You have to take the top and bottom timing belt cover off as if you're changing the timing belt to get it out, or even to test it. It's a good excuse to change the timing belt if need be.
 

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QUOTE (jsinton @ Jul 8 2010, 12:51 PM) index.php?act=findpost&pid=339852
Crank position sensor. Either the connection is bad or the sensor it bad is my opinion. Unfortunately it's not so easy to get to. You have to take the top and bottom timing belt cover off as if you're changing the timing belt to get it out, or even to test it. It's a good excuse to change the timing belt if need be.

The correct answer --> P0320 Ignition/Distributor Engine Speed Input Circuit

**Ignition failure sensor is used to check whether the spark ignition is occurred correctly or not and also used to tachometer drive. The sensor monitors the voltage difference between a resistance which is on the battery circuit for ignition coil. When the ignition coil works properly, the electric current through the resistance is detected as voltage drop. This is confirmed for every ignition event with the crankshaft sensor and the camshaft sensor. If PCM detects a malfunction, no ignition is possible, so the engine would not start. If there is no ignition signal for a predetermined cycle for one or two ignition coils, an ignition coil circuit failure exists.





Replaced a couple on the 2.4 MELCO through the yrs, but I have not done one on the 3.5 MELCO, any thing is possible.
 
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