Question about 1993 Jaguar XJ6

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How can i tell if it is my fuel pump or fuel relay

VCM fault coed fail 24

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Generally speaking if a EFI car wont start but will "turn over" there are many points in the fuel system that could be hindering the process. I would start with the fuel filter. Also if when you begin to turn the ignition on you should be able to hear a light humming noise (this is your fuel pump engaging). If you dont hear this humming it could mean a bad fuel pump. A temporary fix is to take a none abrasive or punctioning object and tap on the fuel tank... Fuel relay would have to be checked electronically...like the previous poster stated...

Posted on Jan 30, 2009

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My book says ignition amplifier circuit

Posted on Feb 19, 2009

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Check the relay trunk all the way in the back use a jumper wire the pump will come on if its good poor wiring in the 93 xj6

Posted on Jan 14, 2009

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I have no fuel pressure where do i start to find the problem


Okay, hey, the fuel pump circuit. With key on, the pump should turn on for about two seconds to put pressure in the line and in the fuel rail on the engine, where the fuel injectors are. When the engine is cranking, the pump is turned on again by the vcm (Vehicle Control Module-the engine computer) signaling the fuel pump relay, just as it did with key on. After the engine is running, the pump is kept on, usually by the oil pressure switch.
No fuel pressure? Then the pump is not turning on, or the fuel filter is completely blocked-which is rare.


You can start at the Underhood Fuse Block. Here is found the fuel pump relay and the fuse for the pump. The fuse is designated ECM-B Fuse and it's 20 amp. If the fuse is good, put your finger on the fuel pump relay. Now have a helper turn the key to on, not start. If the circuit is good to this point, you should feel movement- a slight click. If you feel nothing, and the fuse is good, then the VCM is not sending a signal to the relay OR there is a wiring problem from one side of the relay to ground. If no click or movement under your finger-you will need professional help to diagnose further-checking of the signal from VCM and/or checking the ground wire for that side of the relay.
If you definitely feel a click at the pump relay, and the fuse is good, the power to the pump is sent out from there on a gray wire. Get under the vehicle at the rear and find the electrical connector for the gas tank, and pull it apart. Now you need a test light or voltmeter to check for power on the gray wire in the connector. You might miss the two second signal with key on, so have your helper hold the key in start. While the engine is cranking, the gray wire should have power-battery voltage. If it does not, big problem: possibly a broken wire or short from pump relay to there at the gas tank.

If the gray wire has power with engine cranking, you're almost home: Either the pump has definitely failed OR the ground for the fuel pump is bad. The ground wire is black and it shares the same ground point as your rear exterior lights, so if the lights work, the ground can be assumed to be good also for the fuel pump. And then you need a new fuel pump. But check the gas tank connector carefully for any sign of corrosion, loose terminals, anything like that amiss. Not likely, but check anyway-you don't want to put in a new pump and then find a loose connection! Good luck.

May 05, 2014 | 1999 Chevrolet Blazer

1 Answer

How do i fix codes PO355 and PO305


Trouble Code: P0305

Cylinder 1-8 Misfire Detected

Possible Causes:


ASD relay output 2 circuit fault.Injector control 1 circuit fault.Coil control 1 circuit fault.Ignition wiring, spark plug, or ignition coil faultFuel pump inlet strainer pluggedRestricted fuel supply lineFuel pump module fault.Fuel pressure leakdown fault.Fuel injector is damaged or has failed.Engine mechanical problems exist.PCM has failed.Trouble Code: P0355

Ignition Coil No. 1-8 Primary Circuit

Possible Causes:


ASD relay power circuit to the ignition coil is open.Ignition coil primary "driver" circuit open or grounded.Ignition coil is damaged or it has failed.
PCM has failed.Here are the codes and causes.What you can do is Go to Dodge dealer,get oil change and they will scan your vehicle for free and find problem and tell you and how much it will cost and you can decide to let them or go home and do it your self,but you will find out for free what the problem is,they have a reader that pin points the problem,on these others you can replace good parts trying to find problem.

Jan 06, 2013 | 2002 Dodge Durango

1 Answer

Also Im running my fuel pump direct off my fuse box cause it dont come on with Ignition, checked all fuses they are good is there a relay for pump and if so where.thank you.


The fuel pump relay is located in the underhood fuse-relay center. The vehicle control module (VCM) handles relay operation

Nov 07, 2012 | 1998 Chevrolet C3500

1 Answer

Why wont my 1996 4.3 gmc jimmy start?


might be ecu fault are there any engine managment lights on dash is there defo fuel getting to engine can you here the pump running just incase its a duff pump if its totaly drained the fuel line it would take a bit to get the fuel to the engine any way

Aug 24, 2012 | 1996 GMC Jimmy

1 Answer

Fuel pump relay


The fuel pump relay is located in the underhood fuse and relay center, the bottom box cover lists the components location. I will tell you this, I have never seen a fuel pump relay fail in this car, it is likely if you have no fuel pressure the pump has failed in the fuel tank.

Feb 10, 2012 | 1995 Oldsmobile Cutlass Supreme

1 Answer

Will not start and checked fuel pump no power to fuel pump i also have blown fuse for ecmb that blows as soon as i replace it


ECM B fuse supplies a constant 12v hot at all times to the VCM/PCM and to the fuel pump relay. The fuse is blowing telling you that there is a short to ground somewhere. Try this, take the fuel pump relay out and put a new fuse in. If it doesn't blow put the relay back in and if it blows then try a new relay. The relay may be shorted to ground internaly. Other wise you'll have to trace the wires to the VCM and the pump relay to look for a chafed wire that's contacting metal. The wire coming from the ECM B fuse is orange and has a splice in it going to the pump relay and the VCM/PCM.
Hope this helps.....Andrew

Mar 28, 2010 | 1999 Chevrolet S-10 Pickup

1 Answer

1992 Jaguar XJ6..vcm error codes


code 24 is the ignition amplifier circuit

Sep 08, 2009 | 1992 Jaguar XJ6

1 Answer

No start turns over good has good spark


easy way to check if its getting gas is to take off the breather hose and pour some gas in then put it back on before you try to start it if it starts or even try's too then its fuel pump

Dec 16, 2008 | 1992 Jaguar XJ6

1 Answer

1992 XJ6 fuel fail code 22


FF22 is Fuel Pump Drive failure
ECU looks for sognal to the fuel pump relay.

found in jaguar-forum:
"I'm 99% sure that you have a bad fuel pump connector sending a high resistance fault to the CPU. Check your fuel pump connector at the pump. There is a very short harness in the trunk behind the spare tire and the panel behind it. I think the wires are red and blue? Anyway, the tough part is where they tend to go bad is actually at the pump in the top of the tank. You will not be able to get to it unless you have very small hands. You can get to it easier by dropping the tank a little, you probably won't have to remove the lines, just the tank straps. I have seen this connector overheat and burn. Try and clean it up and apply white grease to it.
If you start to have stalling problems in the future, strongly suspect this. Jumping the fuel relay gave me a little extra juice to the pump so I could move the car."

Oct 18, 2008 | 1992 Jaguar XJ6

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