Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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Can you tell me if this is a 4wd model or 2wd and what engine liter size is in the vehicle?
Let me know so we can continue,thanks Pete.
Have you had the fault codes checked at all to see if any codes have set with this issue ?(using a scan tool that can read all computers in your vehicle)
At the fuel pump relay do you feel or hear it click at all with the key first turned on the first few seconds or when cranking over the engine?(this may take a second person to check this).
Let me know,thanks Pete.
O.k.,do you have a multi meter to test electrical with at all?
O.k.,remove the relay keeping in mind which direction it is installed.You will see four wiring terminals that this relay plugs into.Test the terminals for the signals below and let me know what you come up with so we can continue.
Two of the terminals should have power (at or near 12 volts) with key on or engine cranking
One terminal should only have a ground with the key on first two seconds or engine cranking.
The last terminal is the feed to the fuel pump.Test these above to see if these 3 above have these signals and let me know what you come up with here.
The fuel pump would normally turn on with the command from the engine computer even if there was an issue with a cam or crank sensor so I dont see these as the cause here.
You should have 12 volts at 2 of the blades and then a commanded ground signal on one of the blades from the engine computer with the key on or when cranking.
Are you sure you have 12 volts on 3 blades and no ground signal from the computer?
O.k.,the pump feed may show ground but you should also have another terminal out of the 4 that should have a ground only with the key on the first two seconds or when cranking over the engine then no ground after turning off the key.Let me know.
How many blades do you see that this relay plugs into as my info only shows 4?
O.k.,my info shows one blade receives power directly from fused battery voltage.One blade receives power from another battery source.One blade receives a ground signal only when the engine computer is commanding the pump on and one blade feeds the power to the fuel pump when the relay is energized.
If you have 3 blades with power this indicates that either the wiring is shorted/damaged leading from the relay to the engine computer and the wiring needs traced to inspect for any damage needing repaired or that the engine computer itself is shorted internally and needs replaced.
Inspect for any wiring needing repaired and if found o.k. I suspect the engine computer needs replaced.
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You would need to test the terminal directly out of the ecu to be sure.
You would need to locate the violet wire looks to be at terminal 113 in the connector (below is the connector I apologize as it isnt showing up the greatest).It should have a ground on it according to my info when cranking over the engine.If it has power on it then the ecm is the cause needing replaced.
I double checked the diagram for this here and this wire should be a ground.This does sound like the ECU is the cause here needing replaced as long as you dont have any shorted wiring.