Intermittent immobiliser not turning off.. Again.

Bio · Post by **Bio** » Sat Dec 01, 2012 10:07 am

Hi guys,

On my 98 5th since the weather has started getting colder intermittently my immobiliser won't turn off.
Last time this happened I had to replace the receiver ring round the ignition to resolve it. I've checked everything and it all looks OK from what I can tell.
When turning to pos 2 I get fuel pump prime, 4WS, ABS etc, but the immob just won't turn off. Naturally the green key just keeps flashing and I cant start the car. 3-4 attempts at on and off and the problem usually goes away.

Has anyone got anything thoughts?

My initial thought was main relay but I don't think main relay is the cause because its immob not crank but no start..

Oh yeah, and I did the ignition switch last year too.

Another thought on this, if the immob cant be fixed, would switching to obd1 ECU be an option to remove the immob system?

Post by **Lude-dude** » Sat Dec 01, 2012 1:00 pm

do you have any spare keys?

low/dying battery might cause some problems

mercutio · Post by **mercutio** » Sat Dec 01, 2012 1:02 pm

switch to jdm ecu

Bio · Post by **Bio** » Sat Dec 01, 2012 1:18 pm

I do LD, but its so worn that it wont turn in the barrel so I'd have to get another cut to test it really

I'll give the battery a quick check as it can't hurt and I do have a nice charger that I'd not used yet.

Mercutio; which ECU? I was looking at H-Tune and they seem to have pre-done P28's. Would that be any good to me? or am I looking for a P13? I can't remember.

::EDIT:: Charger indicates about 80% charge. I'll let it top up and see if it helps before jumping into replacing an ECU.. Though it IS a good excuse to get it on a rolling road...

Supermarine Blues · Post by **Supermarine Blues** » Sat Dec 01, 2012 4:14 pm

I'm think that a new battery might have cured my alarm/immobiliser/central locking issues. It's probably worth a try for £66.29, if in doubt

The new throttle cable's also taken years off the way it drives - mind you, that could be less alternator drag as well.

mercutio · Post by **mercutio** » Sat Dec 01, 2012 5:34 pm

just a jdm p13

Bio · Post by **Bio** » Sat Dec 01, 2012 6:18 pm

Cheers merc. I'll keep an eye out for any that turn up.
I've given the battery a charge anyway so we'll see how it goes tomorrow. It's only a year old though so I have a hard time believing it's that, but stranger things have happened I guess.

mercutio · Post by **mercutio** » Sat Dec 01, 2012 6:48 pm

no a 5g jdm p13

Bio · Post by **Bio** » Sat Dec 01, 2012 6:57 pm

Yeah, I was considering OBD1 conversion. If I can pickup a cheap P13 though I won't need it unless I want to tune