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your injectors get their 12v from the asd relay and the computer controls their - side. the asd relay also powers the coil, so if you have spark but no juice to the injectors then you are looking for a broken wire to the injector rail. all of the injectors get their juice from that one source.
There should be a small white ceramic block on the firewall - this component cuts the battery voltage from 12 to 9 volts for the coil and ignition system. It has 4 wires and is called a ballast resistor. You may need a book with the wiring diagram to be able to test it. You should have battery voltage going in and something like 9 volts coming out. You can also run a wire with a fuse from the battery to the positive side of the coil to check the system. Disconnect the factory wire from the coil first.
Test the ignition system output, ignition systems can vary in configuration but operate on the same principal. Ignition systems can consist of a coil, pick up coil, crank angle sensor, cam angle sensor, spark plugs, spark plug wires, distributor cap, ignition rotor and a distributor and any variations of these components. An ignition coil is a voltage stepper coil that transforms a low voltage (12 volts) signal into tens of thousands of volts needed to jump the gap of the spark plug.
This coil is activated by an ignition module triggered by using the camshaft/crankshaft angle sensor; timing is adjusted by the PCM (computer).This primary electrical signal is generated by the PCM which calculates spark timing by using a variety of sensors including coolant temperature, mass air flow, and oxygen sensors. Go to 2carpros.com for a video on how to check this using a 12v light tool. On the engine repair section search, type, "engine cranks but will not start." If my answer helpe you, please leve good feedback. thanks
usually those coils are pulsed at the ground wire end of the coil. So you could have 12 volts in. The question is...do you have 12v out the ground end?
If so then the coil pulseing unit may be bad.That signal,should come from the distributor....or maybe from the ECU Processor.
recheck everything again. check for spark. if no spark, then your distributor is not getting power(12v). if you have spark, then check for fuel pressure. spray starting fluid in the carburator and see if it starts. if it does then your not getting fuel. if you have both then take out the distributor, put your #1 piston at TDC on the compression stroke and reinstall your distributor and try again, your timing may be off. Good luck.
if it goes to the distributor than that is an ignition module.it takes a small signal from the distributor and switches on and off to make a signal with more current to drive the coil.if it is bad you will have no spark.
Hello, Could you possibly be looking on the wrong area? is the rotor turning when engine is cranked? I hate to possibly bring bad news but is the cam belt/chain intact? as if broken you'll never get a spark. Hope this points you in the right direction? if it does please respond by pressing the Blue button for my FREE efforts. Paul 'W' U.K.
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