V70: - ?Immobiliser erratic?

bizzylizzy · Aug 28th, 2008, 10:40

Has anyone experienced similar problem. For weeks ignition key starts up brilliantly from first start, warm start, long interval etc. ok.
Then for no reason one day it just refuses to fire or make any attempt to fire. After using fob to lock and unlock doors from inside car sometimes will then start. Other times need to open and close door as well. Somnetimes this works sometimes it just decides to fire up like a good un aftyer about 7 attempts.
I know it will start eventually but when you have just 'nipped in' somewhere and dived back into your car which then refuses to perform you feel daft or worse still worried if the traffic warden is on the horizon !

This problem seems to go on for a few weeks then disappears as suddenly as it came. Have tried using 3 different keys but same problem on all three.

Thanks for any help. Would be really appreciated.

ocean238 · Aug 28th, 2008, 16:39

which version do you drive? one with ultrasonic sensors in the car or not? I am not sure if it's standard on the SE hence thought i would ask

Times it doesn't start, does it turn over at all?

Clan · Aug 28th, 2008, 18:13

firstly The immobiliser on the ignition key is not connected in any way to the remote locking ...
Secondly as you have tried all the keys that leaves the car ... The first thing i would do is fit a new antenna ring around the ignition lock easy and fairly cheap .. see how that goes ..
Secondly you can get repair wires to replace the female terminals in the immobiliser control unit plug socket .. There is sometimes a problem with the connections there .. Both those jobs done at the same time is most likely to fix it . reading the codes would be a guide too .

striderwilson · Aug 28th, 2008, 18:59

TBH I think your activity in locking / unlocking / opening / closing the door is a bit of a red herring.
Sounds like there is an intermittant problem with the fuel delivery - assuming it turns over, which could be down to the immobiliser (antenna ring most likely as Clan said) or the unit terminals (again as Clan said).
Or it could be the fuel injection relay - a dry soldered joint will give an intermittent fault and the fuel will simply not feed to the engine. Best way to test this is to wait untill the problem re-occours then switch the ignition on so all the dash lights come on and wait a couple of seconds listening for a 'tick' from behind the dash. If you hear a tick - that should be the relay working as it should. No click and the relay is probably faulty.
If it is the relay, get a Haynes manual, pull the relay out of the car, open it up, find a 'dry' soldered joint or a cracked joint, and solder it back up (remember to use a heat sink near to any components).
At least with the fuel relay you can 'test' it before you spend any time or money by using the 'tick' check.
James

Chris_Rogers · Aug 28th, 2008, 21:35

This thread may help:

http://www.volvoforums.org.uk/showth...t=anntena+ring

capt jack · Aug 29th, 2008, 16:37

Had the same problem with SWMBO's S70. Try putting the key in the other way up - works every time for us!

Jack

Aug 28th, 2008, 10:40	#1
bizzylizzy New Member Last Online: Aug 28th, 2008 11:35 Join Date: Aug 2008 Location: Barnsley	?Immobiliser erratic? Has anyone experienced similar problem. For weeks ignition key starts up brilliantly from first start, warm start, long interval etc. ok. Then for no reason one day it just refuses to fire or make any attempt to fire. After using fob to lock and unlock doors from inside car sometimes will then start. Other times need to open and close door as well. Somnetimes this works sometimes it just decides to fire up like a good un aftyer about 7 attempts. I know it will start eventually but when you have just 'nipped in' somewhere and dived back into your car which then refuses to perform you feel daft or worse still worried if the traffic warden is on the horizon ! This problem seems to go on for a few weeks then disappears as suddenly as it came. Have tried using 3 different keys but same problem on all three. Thanks for any help. Would be really appreciated.

Aug 28th, 2008, 16:39	#2
ocean238 Senior Member Last Online: Aug 15th, 2011 23:17 Join Date: Dec 2007 Location: Stockholm, Sweden	which version do you drive? one with ultrasonic sensors in the car or not? I am not sure if it's standard on the SE hence thought i would ask Times it doesn't start, does it turn over at all? __________________ No longer own a Volvo. ex: C70 2.4T 2000 ex: S70 2.5 10V 1997

Aug 28th, 2008, 18:13	#3
Clan Experienced Member Last Online: Today 11:30 Join Date: Jun 2007 Location: L/H side	firstly The immobiliser on the ignition key is not connected in any way to the remote locking ... Secondly as you have tried all the keys that leaves the car ... The first thing i would do is fit a new antenna ring around the ignition lock easy and fairly cheap .. see how that goes .. Secondly you can get repair wires to replace the female terminals in the immobiliser control unit plug socket .. There is sometimes a problem with the connections there .. Both those jobs done at the same time is most likely to fix it . reading the codes would be a guide too . __________________ My comments are only based on my opinions and vast experience .

Aug 28th, 2008, 18:59	#4
striderwilson Junior Member Last Online: Sep 20th, 2022 12:26 Join Date: Feb 2008 Location: Derby	TBH I think your activity in locking / unlocking / opening / closing the door is a bit of a red herring. Sounds like there is an intermittant problem with the fuel delivery - assuming it turns over, which could be down to the immobiliser (antenna ring most likely as Clan said) or the unit terminals (again as Clan said). Or it could be the fuel injection relay - a dry soldered joint will give an intermittent fault and the fuel will simply not feed to the engine. Best way to test this is to wait untill the problem re-occours then switch the ignition on so all the dash lights come on and wait a couple of seconds listening for a 'tick' from behind the dash. If you hear a tick - that should be the relay working as it should. No click and the relay is probably faulty. If it is the relay, get a Haynes manual, pull the relay out of the car, open it up, find a 'dry' soldered joint or a cracked joint, and solder it back up (remember to use a heat sink near to any components). At least with the fuel relay you can 'test' it before you spend any time or money by using the 'tick' check. James Last edited by striderwilson; Aug 28th, 2008 at 19:11.

Aug 28th, 2008, 21:35	#5
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	This thread may help: http://www.volvoforums.org.uk/showth...t=anntena+ring

Aug 29th, 2008, 16:37	#6
capt jack VOC Member Last Online: Apr 20th, 2024 18:56 Join Date: Jun 2006 Location: Selby, North Yorkshire	Had the same problem with SWMBO's S70. Try putting the key in the other way up - works every time for us! Jack

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