May 162008
 

Question:

1994 Honda Civic with a 1.5 L engine. Good spark but no power to the fuel pump from the main relay and no ground pulse to the injectors. I suspect the ecu is faulty. Any ideas? Already Tried:
New PGMFI relay and checked for power at injectors. Has power at injectors but no ground pulse. No power to fuel pump from relay. Power to relay and ground to relay is good.

Answer;

The relay powers the circuit in the computer that sends ground to the fuel pump, and pulses the injectors. If the relay is good, and working right, getting power and all that, then there is either a problem in the wiring between the relay and computer (not likely), or the computer is indeed damaged..

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