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[monsterob]

hello i need some help with my immobiliser. im using the omega as a donor car for a haynes roadster but im having difficulty with the alarm immobiliser system. the car was a p reg 2.0 16v ecotec i took all the bits i needed including the full loom. i have two keys the the immobiliser ecu on the colulm and the ecu from the donor the car is now sat with the bits in place i was trying to temporarily start the engine. the car cranks over and the fuel pump primes but i have no spark at the plugs i have done the paperclip test and i get a 1502 code which i beleive is immobiliser control unit fault (no signal). but have read that it could be the camm or crankshaft sensor.

im not sure which type of immobiliser it has. i have the alarm fobs and the two keys does the imobiliser purely work by having the key inserted or is it the type that you deactivate with the fob ? can anyone shed a bit of light for me ? or even a way to bypass the immobiliser alltogether i just want the engine to fire up and seeing as ive tried to use as much of the donor as possible clocks fuel pump hubs etc etc id like to have it run on the original ecu.

many thanks
rob

[TheBoy]

Is the transponder near the immobiliser ecu?

[monsterob]

the transponder i presume is in the key if so yes it is acting exactly as in the omega as ive used the omegas steering colulm immobiliser ecu and switches. the EML doesnt flash when the car turns over so im presuming its something else the camm sensor wire sheath has been stretched / broken but surely this would produce a cam sensor fault on the paper clip test. what i have not got plugged in is any of the central locking system and i cut the lower loom that travels over the tunnel to the drivers side of the car and thewiring to the alarm ecu . is this the likely cause as the alarm ecu is no longer connected ? tbh its a propper can of worms now and my eyes hurt from looking at the haynes wiring diagrams.
is there a way to bypass the immobiliser just to get the engine to run ?

[Entwood]

If it was easy to bypass the immobilisor then Mr Thatcham would not have certified the car to the level he has.... that after all is the PURPOSE of an immobilisor !!!

 

AFAIK you must have the ECU/Immobilisor ring/transponder all from the same vehicle before they "talk" .. but if they don't "talk" the EML flashes .. as yours is not doing so my guess is the problem may well be nothing to do with the immobilisor

[TheBoy]

Doesn't sound like immobiliser fault then

[monsterob]

this is what i had concluded after reading on various forums and studying the wiring diagrams. basically im getting no spark but the fuel pump primes etc. the paper clip test threw up 3 faults secondary air pump (in the loft) and a MAF sensor fault. and the immobiliser control unit failure (no signal).

better search for maf sensor failure read up on that.

[Kevin Wood]

Secondary air and MAF sensor are not items that would stop it starting, IMHO.

I believe the shield on those cam sensors is used as a ground connection, so that would be worth repairing. If either cam and crank sensor had failed it would still start in limp-home mode, so could be crank sensor has a problem too.

Is there any evidence that the ECU detects cranking? (Is fuel pump activated when cranking, any fuel being injected during cranking? do you get a blip on the rev counter?)

At the end of the day, if needs fuel pressure, injectors, coil packs, throttle position sensor and crank/cam sensor working to fire. Pretty much any other fault and it would try to start.

If the throttle position sensor is getting an wide open throttle signal it will disable fuel injection. Should still get a spark, though.

I can't remember what the 4 pots do when the immobiliser is active, but I would expect them to fire for a couple of turns then die. You should get a rapidly flashing EML / immobiliser warning light at any rate.

[monsterob]

well after alot of head scratching ive decided to bin the whole lot and just nick the bits i need to run mega squirt and seeing as im fitting the megasquirt i decided to upgrade the intake system







38mm motorcycle throttle bodies home made manifold should improve things a little 

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