I have changed everything in this car: distributer,map,coil,starter,spark plugs and we checked the ECM and it seems okay. The car cranks, but won't start. We plugged the scanner to the ECM and there is no signal. What can it be? I am out of ideas.
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1996 Honda Accord Question: no spark and no signal to the auto scanner
Answer #1Andy Y February 03, 2009, 16:57Master
Have you checked the (PGM-FI) Main Relay? That controls power to the fuel pump. Have you checked the fuel pressure?
patrick mannion from Greg Solow's Engine Room, February 03, 2009, 22:53Master
Turn the key on to the run position, does the yellow Check Engine light come on, if it does the Fuel Injection Computer is getting power, if not ECU powers and ground need to be checked.
Next get a friend to crank the engine over crack open the fuel filter banjo bolt, does fuel squirt out? If it does the distributor is sending a signal to the main relay and the main relay is sending power to the fuel pump and the fuel pump is operative. If not distributor may not be sending a signal to the Main Relay (under the dash drivers side) or the main relay has failed or the fuel pump has failed.
With a six inch screw driver put the handle end up against your ear and the metal end against the plastic fuel injector (poor man's stethoscope) get your friend to crank over the engine, if the fuel injector is getting power, getting a cranking signal and distributor signal, and the computer interprets these inputs, you should hear a rhythmic click, click, click, click as the vehicle is cranked over, what this is, is the injector nozzle opening and closing on its seat.
Let me know if this helps.