Chrysler Repair: 96 Cirrus: 2.5 V-6: no spark, no codes, crankshaft pulley, pulley bolt

Question
Hi, I have a 96 chrysler Cirrus and it ran good up intill three days ago. It gets no spark and the dignostics check engin light reads 12 battery or computer recently disconected and then 55 end of codes.

Answer
Hi Matt,
That code is not helpful, as you can see. I would check to see if there is a 5000 ohm resistance between the center button and the ignition coil terminal of the distributor cap. Also I assume there is a rotor so check that it is patent between the tip and center of the rotor. Other than that, it may be that the crankshaft sensor (or the camshaft sensor) is failing, but not so extremely as to set a code 11 or a code 54. You could measure the voltage pulsing of those sensors while you turn the engine over by hand using a wrench on the crankshaft pulley bolt. Measure between the gray/black and black/light blue wires and between the tan/yellow and black/light blue wires for those sensors, respectively. The voltage should oscillate between 5.0 and 0.3 volts several times per revolution of the crank. You can use fine pins to probe throught the insulation to contact the center conductors of those wires. The ignition switch must be in the run position, of course.
Those are my suggestions for a no start with no spark and no codes. You could also check the black/gray wire on pin 6 of the six pin plug to the distributor to see if it is pulsing in the same way (three times per revolution) as that is the "driver" for the spark coil which originates in the PCM if the sensors are doing their job and the PCM likewise. Compare the voltage to ground, and it should be bouncing between 12V to 0V. If that were pulsing, and you have 12V on the dark green/orange wire when cranking, then you should get spark output if the coil, rotor and cap are good.
Roland