Fuel pump relay issue
Fuel pump relay issue What controls the length of time that the fuel pump runs when the ignition switch is first turned to the run position? My car is cycling the relay on and off very quickly and doesn't stop until the key is off. I have checked the wiring on the four pins of the relay and swapped out the relay. I am thinking that I have a bad pcm. Everything was working two weeks ago. Is there anything that I can check before I send out the pcm?
On The Tree
Joined: Jul 2009
Posts: 122
Likes: 1
From: Richmond, VA
I want to resurrect this thread because I am having a similar problem. My fuel pump relay is cycling very quickly, but I do not believe that it is because of a bad ground (grounded to the same location as the negative battery terminal). I also know that I have 12 volts coming from the ECU.
Just like 76LQ9TA said, the relay chatters and does not stop until the key is off. I have the added complication, though, of the engine won't start with the relay connected. If I build fuel pressure, and then disconnect, it fires right up. This makes me think there is short through it (short would still provide the 12v that I see).
Any thoughts?
Just like 76LQ9TA said, the relay chatters and does not stop until the key is off. I have the added complication, though, of the engine won't start with the relay connected. If I build fuel pressure, and then disconnect, it fires right up. This makes me think there is short through it (short would still provide the 12v that I see).
Any thoughts?
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On The Tree
Joined: Jul 2009
Posts: 122
Likes: 1
From: Richmond, VA
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If I unhook either the lead from the battery, or the wire to the fuel pump the relay behaves exactly as it should. I am thinking that this means a bad ground at the fuel pump. I'll let you know how that pans out for me.
If I unhook either the lead from the battery, or the wire to the fuel pump the relay behaves exactly as it should. I am thinking that this means a bad ground at the fuel pump. I'll let you know how that pans out for me.
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