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Tech501
Tech501, Auto Service Technician
Category: Car
Satisfied Customers: 747
Experience:  38 years exp, ASE Mastertech with L1 Advanced Engine performance
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subject says it all

Customer Question

subject says it all
Submitted: 11 years ago.
Category: Car
Expert:  joe allen replied 11 years ago.

 well you will have to start at the battery and check the voltage here first.


If there is voltage here than you will have to check for source voltage at the ignition coil .... I would think right off that this is where your problem maybe. because it is not likely for two coil packs to go out at the same time.


Be very carefull when playing with this system. The primary is not that bad with only 12 volts going through it But the seconary going to the plugs runs about 20,000 volts.


If you don't play with cars alot then you may want to go out and get the haynes or chilton manule.

Expert:  Tech501 replied 11 years ago.

 First check for injecter pulse with a noid light. If you don't have injecter pulse either, you problem likely lies with either the crank sensor or the cam sensor as the work together to generate the reference signal. We would use a lab scope to test them. Here's the instruction for the crank sensor.



TESTING


See Figure 2


To test this sensor, you will need the use of an oscilloscope.


Visually check the connector, making sure it is attached properly and all of the terminals are straight, tight and free of corrosion.


The output voltage of a proper operating camshaft or crankshaft position sensor switches from high (5.0 volts) to low (0.3 volts). By connecting an oscilloscope to the sensor output circuit, you can view the square wave pattern produced by the voltage swing.


Click image to see an enlarged view

 

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