OBD says No link
#1
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My 2004 XJ8 refused to start. The starter turns over fine, but the engine doesn't kick in. I connected my OBD II reader to the car and all it would say was NO LINK. That's never happened before.
I tried the reader in a Toyota Camry and it worked fine, but only in the "all power on" ignition position.
(I warmed up the garage, recharged the battery to full, swapped a relay that can cause starting failure, and changed my engine air filter (it needed changing anyway), but none of that helped. Ordered a K&N fuel filter; haven't gotten it yet.)
I tried the reader in a Toyota Camry and it worked fine, but only in the "all power on" ignition position.
(I warmed up the garage, recharged the battery to full, swapped a relay that can cause starting failure, and changed my engine air filter (it needed changing anyway), but none of that helped. Ordered a K&N fuel filter; haven't gotten it yet.)
#2
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Well not really enough information and the possibilities are many but since your message is no link, I would personally do a hard reset - disconnect the battery, hold the Pos and Neg cables for a minute. Then reconnect the battery and see if you get a signal.
Next place I would check is the ECU harness connection.
Start there. Others will weigh in.
Next place I would check is the ECU harness connection.
Start there. Others will weigh in.
#4
#5
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Hi Xeno,
Just to elaborate on Sean's questions, did you have the Jaguar's key turned to Position II (ON) when you attempted to use your OBDII scanner? The scanner will not work with the key in Position I or out of the ignition lock.
In your Toyota, the scanner should work with the key in Position II with or without the engine running. Your Jag should work that way too once you get it running again.
One possibility is that even though you recharged the battery, its voltage while cranking is sagging too low. If the voltage drops to around 10.5 volts while cranking the ECM will not trigger the ignition to fire. Most voltmeters do not react quickly enough to measure the true voltage sag.
Out of curiosity, which relay did you swap?
The reset Sean recommends will get your scanner working, but any stored fault codes may be cleared from the memory....
The next steps would be to confirm that you have good spark and fuel pressure at the fuel rail.
Cheers,
Don
Just to elaborate on Sean's questions, did you have the Jaguar's key turned to Position II (ON) when you attempted to use your OBDII scanner? The scanner will not work with the key in Position I or out of the ignition lock.
In your Toyota, the scanner should work with the key in Position II with or without the engine running. Your Jag should work that way too once you get it running again.
One possibility is that even though you recharged the battery, its voltage while cranking is sagging too low. If the voltage drops to around 10.5 volts while cranking the ECM will not trigger the ignition to fire. Most voltmeters do not react quickly enough to measure the true voltage sag.
Out of curiosity, which relay did you swap?
The reset Sean recommends will get your scanner working, but any stored fault codes may be cleared from the memory....
The next steps would be to confirm that you have good spark and fuel pressure at the fuel rail.
Cheers,
Don
Last edited by Don B; 01-09-2017 at 11:41 PM.
#6
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Hi Xeno,
One possibility is that even though you recharged the battery, its voltage while cranking is sagging too low. If the voltage drops to around 10.5 volts while cranking the ECM will not trigger the ignition to fire. Most voltmeters do not react quickly enough to measure the true voltage sag.
One possibility is that even though you recharged the battery, its voltage while cranking is sagging too low. If the voltage drops to around 10.5 volts while cranking the ECM will not trigger the ignition to fire. Most voltmeters do not react quickly enough to measure the true voltage sag.
One, pull the battery and have it load tested at your local auto parts store. To Don's point, it may be enough voltage to crank but not enough to start.
Option 2- put your voltmeter in the posts. Have someone crank the engine and measure the drop (load). If it's below 10.5, consider a new battery.
I'm also curious as to the relay swap. Which one and what compelled you to do it?
Last edited by Sean W; 01-10-2017 at 10:44 AM.
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#8
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Hi Xeno,
Just to elaborate on Sean's questions, did you have the Jaguar's key turned to Position II (ON) when you attempted to use your OBDII scanner? The scanner will not work with the key in Position I or out of the ignition lock.
In your Toyota, the scanner should work with the key in Position II with or without the engine running. Your Jag should work that way too once you get it running again.
Just to elaborate on Sean's questions, did you have the Jaguar's key turned to Position II (ON) when you attempted to use your OBDII scanner? The scanner will not work with the key in Position I or out of the ignition lock.
In your Toyota, the scanner should work with the key in Position II with or without the engine running. Your Jag should work that way too once you get it running again.
One possibility is that even though you recharged the battery, its voltage while cranking is sagging too low. If the voltage drops to around 10.5 volts while cranking the ECM will not trigger the ignition to fire. Most voltmeters do not react quickly enough to measure the true voltage sag.
Out of curiosity, which relay did you swap?
The next steps would be to confirm that you have good spark and fuel pressure at the fuel rail.
I just checked all the fuses that sounded like they had anything to do with the ignition or the fuel pump, but they were all good. (I wish the relays had holes in their heads so we could test them without removing them.)
My immediate plan is to put in a new fuel filter, which I need to do anyway (86K mi and never changed AFAIK) and see what happens.
Last edited by Xeno; 01-11-2017 at 09:35 AM.
#9
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I'm also curious as to the relay swap. Which one and what compelled you to do it?
Last edited by Xeno; 01-11-2017 at 06:17 PM.
#10
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I cleared that, then immediately got a P1000 (System readiness test not complete).
Then I put the first OBD in, and it worked (giving a P1000).
I'm starting a new post for the "won't start" problem, but the "no link" problem is solved, I guess.
#11
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Never delete P1111 if that's the only code.
Sounds like your no start problem lies elsewhere. Are you sure the engine is not flooded with fuel? This is very common with engines that never get chance to warm up properly, even worse in winter.
Hold the gas pedal to the floor while you crank and don't let up till the engine starts to fire.
#12
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The engine block still makes that same whining noise when I turn the ignition to the 3rd position. Is that normal? Most people probably wouldn't hear it without opening the hood.
#13
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