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I've been having problems with my 1994 Acura legend L sedan. The main concern is that it doesn't turn over when i start the ignition and the fuel pump is not energized. The schematics I have only place the PGM-FI relay as a common tie point to both units, so I devised a jumper for degenerative operation. I jumpered from my interior fuse panel to the fuel pump 12 volts and also 12 volts jumpered from my fuse panel to the b/y wire that goes into the security unit. Now the car starts, but I still really don't know what the problem is. I opened the PGM-FI relay and it seems to be working as the Hanes manual described, the fuel pump relay activating for a couple seconds then de-energizing and the other really fully energizing, so that is all that i really know. Could it be the control signals from the PCM or the ECU? I'm stumped.
 
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The main relay is a common problem on Legends and other Hondas. Some have repaired the relay, most just replace it. If I remember correctly, some of the solders on the circuit board inside can break causing failure. I think the relays may still open and close as necessary, but the broken joints are causing problems with pass through.
 

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Legend won't start. Battery and starter good.

1. main relay
or
2. ignition switch
or
3. ground wire left off engine while performing other maintenance.
 

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Jetdoc said:
Legend won't start. Battery and starter good.

1. main relay
or
2. ignition switch
or
3. ground wire left off engine while performing other maintenance.
Good tips. Main relay would be most common, then ignition switch and I guess the ground wire is possible. Have not heard that much though.
 

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3. ground wire left off engine while performing other maintenance.
It happened to me. I replaced the thermostat an failed to connect the ground wire that bolts to the thermostat housing. It would turn over but would not fire. There is also a ground that connects to the fuel rail that will cause a no start if disconnected.
 

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Somewhere on this forum there is a post explaining how to tell the difference between the ignition switch or relay starting to go bad. If I remember, one difference is that the tach and instruments show some activity on one but not the other. As for the ground strap - that one might be somewhat easier to determine as it probably didn't run after the car was worked on. Right?
 
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