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Are you saying the starter motor won't crank the engine? If so, I'd have to make sure battery has a full charge and battery connections all good. I'd also check the starter motor wiring circuits. Any testing at starter motor, make sure tranny is in park or neutral and parking brake is set.
Now, if it cranks good but won't start, have a helper crank it while you check for spark at the spark plugs, if spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
Code 54 should be for the cam sensor in distributor. If I get a code for cam or crank sensor, I usually check them both. I check the wiring circuits.
Code 345 means the cam sensor on bank two is not sending the correct signal to the engine computer. So no spark.
If you have replaced the sensor, the problem could be the cam or the wiring from the sensor to the computer.
turn over or run
turning over is cranking but not starting/running
not turning over indicates seized motor , bad battery starter motor problems , bad ground
turning over is cranking but not starting ---broken timing belt/chain, crank/cam position sensors , no fuel , no spark , no injector operation
best run the fault codes as the fauty will be recorded there
An ohm reading is good but what you need is a voltage reading at the injectors to make them work . Check that the cam/crank shaft position sensors are connected and the air gap is correct
It's very likely your fuel pump has failed. Have somebody thump on the fuel tank while you're cranking the engine and see if it starts. If it does, replace the fuel pump. Otherwise get your fuel pressure checked, and check for spark. If no spark, check to make sure the distributor is turning(if applicable) If a 3.3 motor with no spark, suspect the crank sensor or cam sensor. Crank sensor is much easier to replace if experimenting.
Did you check your coil pac? This supplys power to all parts of your auto. I would check and see if your getting fire comming from your coil , Good luck to you.
check coils for spark if you have spark comming form all the wires and coils etc and then check for fuel and if you have these all working and still no start it could be a sensor either a cam or crank shaft sensor depending on the motor config
being 94' im sure it has high miles, cam and crank sensor common to fail over time do to wear and heat exposure. check the basic, make sure you getting fuel and sparks. fuel pump only work as long the engine is turning over due to the crank sensor sense the flywheel turning. crank sensor may be faulty. no sparks, check coil make sure is good and putting out 12v, auto zone can test it for free. good coil, than check cam sensor, cam sensor senses the cam turning and tell the ecu to tell the coil to disperse the sparks to the plugs. cam and crank sensors, there no way of testing it but replacing the unit unless you have the special equipment to test it; both is fairly cheap to replace, check ebay.
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