No power to my fuel pump fuse?
#1
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Join Date: Sep 2008
Location: Damon /Houston, Texas
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jaglenn (04-07-2014)
#3
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Join Date: Sep 2008
Location: Damon /Houston, Texas
Posts: 7,254
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i would suggest you get a wiring diag for your car so you can see the circuits and applications. lots of circuits are ground application and 1 hot, then a gnd signal from ecu and closes relay to complete a gnd circuit as is MOST new cars today even though yours is not very new anymore. most circuits are gnd circuits and triggered or pulsed grounds
#5
Hi Glenn,
Check these fuses,
F3 5A, trunk fuse box, that is the ignition supply to the fuel pump relay in the same box, relay 4.
F7 20A, trunk fuse box, that is the fuse for the fuel pump from the output of the above relay contact.
In the high power protection module, also in the trunk, you should find 3 x 250A fuses. You are looking for the one with 2 output lines connected to it. Check this one also.
Also check the voltage with ignition on, at the input and output of the fuel pump relay.
Hope this helps,
Check these fuses,
F3 5A, trunk fuse box, that is the ignition supply to the fuel pump relay in the same box, relay 4.
F7 20A, trunk fuse box, that is the fuse for the fuel pump from the output of the above relay contact.
In the high power protection module, also in the trunk, you should find 3 x 250A fuses. You are looking for the one with 2 output lines connected to it. Check this one also.
Also check the voltage with ignition on, at the input and output of the fuel pump relay.
Hope this helps,
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#9
What you are seeing is normal steady state. The fuel pump (and relay) will not run continuously, just for a few seconds when the ignition turns on or if the engine is running. The relay is ground switched, as Brutal said. Have someone turn on the ignition while you are watching the voltage to the fuel pump...you should see the voltage briefly appear then drop out if the engine does not start.
Chances are you have a bad pump.
Chances are you have a bad pump.
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jaglenn (04-07-2014)
#10
I have installed a new fuel pump.
the ignition relay in the trunk was out of place.. I am NOW getting power to f3.. 12.23v
again i had my wife cycle through the key positions and am only getting a couple mili-volts from to the f7 fuel pump fuse. I am getting 12.28 on two poles of the fuel pump relay
the ignition relay in the trunk was out of place.. I am NOW getting power to f3.. 12.23v
again i had my wife cycle through the key positions and am only getting a couple mili-volts from to the f7 fuel pump fuse. I am getting 12.28 on two poles of the fuel pump relay
#12
I have installed a new fuel pump.
the ignition relay in the trunk was out of place.. I am NOW getting power to f3.. 12.23v
again i had my wife cycle through the key positions and am only getting a couple mili-volts from to the f7 fuel pump fuse. I am getting 12.28 on two poles of the fuel pump relay
the ignition relay in the trunk was out of place.. I am NOW getting power to f3.. 12.23v
again i had my wife cycle through the key positions and am only getting a couple mili-volts from to the f7 fuel pump fuse. I am getting 12.28 on two poles of the fuel pump relay
If you ALWAYS (with the key on) have 12v (to ground) on both Relay COIL Terminals, the ECM is Never Energizing the Fuel Pump.
These measurements are with the Relay Plugged in to the Socket.
The Relay COIL Terminals are the ones that are opposite and Parallel to each other.
Last edited by Paul Pavlik; 04-07-2014 at 09:04 PM.
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jaglenn (04-08-2014)
#13
The first link is for a voltage test I made to my 99xk8 and should help the second link is a wiring diagram for a 98xk8. Both should help.
Link JagRepair.com - Jaguar Repair Information Resource
Link http://www.jagrepair.com/images/Auto.../jagxk1998.pdf
Link JagRepair.com - Jaguar Repair Information Resource
Link http://www.jagrepair.com/images/Auto.../jagxk1998.pdf
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jaglenn (04-08-2014)
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Assuming you still have the problem, you should check for wiring continuity to the ECM on the Pink/Brown wire.
If there is a fault on this ECM circuit to the relay, or the ECM itself, it should also set an OBDII fault code (P1230) and come back even if you reset the code.
#16
Try a relay swap (the brown ones are identical) if you have not already.
Assuming you still have the problem, you should check for wiring continuity to the ECM on the Pink/Brown wire.
If there is a fault on this ECM circuit to the relay, or the ECM itself, it should also set an OBDII fault code (P1230) and come back even if you reset the code.
Assuming you still have the problem, you should check for wiring continuity to the ECM on the Pink/Brown wire.
If there is a fault on this ECM circuit to the relay, or the ECM itself, it should also set an OBDII fault code (P1230) and come back even if you reset the code.
Also the car will NOT connect to my OBDII... it's the Innova 3100 I have read in the OBDII thread that it is known to work.
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#18
Also.. while going through the stuff I got with the car... i have found two other ECMs I was told they changed out the ECM and reprogramed/flashed it so it looks like they felt it was a computer problem as well... BTW I have like many gotten the car in this condition with very little information attached.
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