2003 XJR Fuel pumps not working
#21
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The FP relay code is likely due to one of the relays were out of the socket when you had the key on. Just a reminder, you don’t need the key in the ignition when you do jump both FP relays. You could have the key in your pocket, jump both relays and have the FP’s functional. If you have fuel in the tank and you jump both of them, you should hear them operate as long as there’s no noises outside the vehicle. Maybe even take the gas cap off and listen??
Concerning the MAF sensor, it’s the same situation. If for some reason it was unplugged when you had the key on, those codes will come up. I’d clear those codes out.
How much fuel do you have in the tank?
Concerning the MAF sensor, it’s the same situation. If for some reason it was unplugged when you had the key on, those codes will come up. I’d clear those codes out.
How much fuel do you have in the tank?
#22
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The FP relay code is likely due to one of the relays were out of the socket when you had the key on. Just a reminder, you don’t need the key in the ignition when you do jump both FP relays. You could have the key in your pocket, jump both relays and have the FP’s functional. If you have fuel in the tank and you jump both of them, you should hear them operate as long as there’s no noises outside the vehicle. Maybe even take the gas cap off and listen??
Concerning the MAF sensor, it’s the same situation. If for some reason it was unplugged when you had the key on, those codes will come up. I’d clear those codes out.
How much fuel do you have in the tank?
Concerning the MAF sensor, it’s the same situation. If for some reason it was unplugged when you had the key on, those codes will come up. I’d clear those codes out.
How much fuel do you have in the tank?
Last edited by 03_jaaag; 05-10-2024 at 03:29 PM.
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#27
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...just a heads up....typically when you clear OBD codes, many of the on-board emissions system monitors have to relearn/reset themselves. That can take a fair amount of drive time, even if you drive through the factory reset profile several times. If you have to get a "PASS" on a required emissions inspection as a pre-registration/license plate renewal, this can be a holdup in the process.
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03_jaaag (05-12-2024)
#28
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...just a heads up....typically when you clear OBD codes, many of the on-board emissions system monitors have to relearn/reset themselves. That can take a fair amount of drive time, even if you drive through the factory reset profile several times. If you have to get a "PASS" on a required emissions inspection as a pre-registration/license plate renewal, this can be a holdup in the process.
no emissions test for me (canada). dash was throwing a bunch of codes before like restricted preformance and abs. now it just shows suspension fault and low brake fluid
#29
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So I’m assuming that you tried to start the engine. Excluding the lights, what did you do? Did you get a little more petrol for it?
Do you have the battery on a maintainer/charger? If not, you need to because the battery needs to be healthy before going any further. If I were you, I’d clear all the codes in all modules followed by a hard reset before you try to start it.
Do you have the battery on a maintainer/charger? If not, you need to because the battery needs to be healthy before going any further. If I were you, I’d clear all the codes in all modules followed by a hard reset before you try to start it.
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03_jaaag (05-14-2024)
#30
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So I’m assuming that you tried to start the engine. Excluding the lights, what did you do? Did you get a little more petrol for it?
Do you have the battery on a maintainer/charger? If not, you need to because the battery needs to be healthy before going any further. If I were you, I’d clear all the codes in all modules followed by a hard reset before you try to start it.
Do you have the battery on a maintainer/charger? If not, you need to because the battery needs to be healthy before going any further. If I were you, I’d clear all the codes in all modules followed by a hard reset before you try to start it.
#31
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A hard reset for a Jaguar X308 involves disconnecting the battery earth lead and holding
the lead on the battery positive post for about ten seconds. When reconnecting the earth
lead, make sure to do so cleanly without hesitation. Keep in mind that if you need a radio
security code and don’t have it, you might run into trouble. This process essentially resets
various parameters, including long-term fuel trim levels and gearbox adaptations, back to
their factory default settings. As you drive, the car learns about your driving style and
adjusts these variables accordingly.
the lead on the battery positive post for about ten seconds. When reconnecting the earth
lead, make sure to do so cleanly without hesitation. Keep in mind that if you need a radio
security code and don’t have it, you might run into trouble. This process essentially resets
various parameters, including long-term fuel trim levels and gearbox adaptations, back to
their factory default settings. As you drive, the car learns about your driving style and
adjusts these variables accordingly.
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03_jaaag (05-14-2024)
#34
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There may be no statement regarding the "requirement to touch the positive
terminal with the disconnected negative cable" although the practice is logical
to discharge those capacitors which are retaining charge. If one has an aversion
to that idea, one might simply wait about thirty minutes before reconnecting.
terminal with the disconnected negative cable" although the practice is logical
to discharge those capacitors which are retaining charge. If one has an aversion
to that idea, one might simply wait about thirty minutes before reconnecting.
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03_jaaag (05-17-2024)
#35
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put battery to charge it says it was at 70 percent. making a checklist. maf unplugged, more gas, hard reset. was also reading in another forum it could be engine temp sensor causing no fuel when i turn the key, or the inertia switch. I’ve checked the inertia switch before but didn’t see any buttons. maybe it was something else. where is it located on LHD cars? i believe i checked the drivers side pedal area behind carpet. Does the inertia cut spark as well or just fuel? because i got it running with marvel mystery oil in the cylinders, so i know i have spark. i’m guessing something is restricting the injectors. I also have fuel at the schrader valve with pumps hotwired
Last edited by 03_jaaag; 05-19-2024 at 05:10 PM.
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#38
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well fully charged battery, added another 5l of gas, cleaned engine/coolant temp sensor and tried with maf unplugged and plugged and still not starting. will do the hard reset if weather is still good tomorrow and ill get alligator clips to test the fuel injector relay. can i hotwire the injector relay?
Last edited by 03_jaaag; 05-23-2024 at 08:07 PM.
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