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[Ken T]

I am having problems with the car, it looks like an imobiliser problem. If I fitted a replacement main ECU and key, would the car start and drive?. Would I need to get the gearbox ECU programmed to it, or would it work in 'limp home' mode until programmed?

[Marks DTM Calib]

You would need a replacement engine ECU, Key fob transponders (you dont need the whole key) and the immobiliser ECU....all from a known good source and the same vehicle

The gearbox ecu etc requires no changes.

What makes you think its an immobiliser fault?

[Ken T]

Hi Mark, there is another thread in the help wanted section about 'serious limp home mode... Basically what happens is when I put the key in and turn, the immobiliser and emissions symbols flash about 6 times, then stay on, and the car wouldn't start.

[TheBoy]

Hi Mark, there is another thread in the help wanted section about 'serious limp home mode... Basically what happens is when I put the key in and turn, the immobiliser and emissions symbols flash about 6 times, then stay on, and the car wouldn't start.

I would be inclined to get the codes read...

[Ken T]

Hi, the initial code was P1740. The electrician didn't find anything new, and seemed convinced it was the imobiliser reader, which I went and bought, only after a bit of thinking, I recon its not, eg if the key bit were wrong, the imobiliser light would flash during churning, not at initial turning key to ignition. Anyone want to buy a new imobiliser reader?. I have given up, sorry but nearly 2 weeks without a car has stopped my work plans and totalled my earning capacity. I got it shipped down to the local Vaux dealer, Evans Halshaw in Dewsbury for an initial diagnosis for £65. We'll see what they say. i mean if it were bad fuel, I wouldn't know, but hopefully they would. Here's hopeing.

[TheBoy]

Is yours an auto, and are you getting any gearbox warnings?

[Ken T]

yes its an auto, gearbox warnings?. The car drove fine, no problems. Very occasionally it wouldn't change up until the revs were nearly 6000rpm, but that has only happened a couple of times. If the gearbox got upset, could that stop the engine from starting?.

[TheBoy]

yes its an auto, gearbox warnings?. The car drove fine, no problems. Very occasionally it wouldn't change up until the revs were nearly 6000rpm, but that has only happened a couple of times. If the gearbox got upset, could that stop the engine from starting?.

Just thinking that last time I saw the Torque Control codes, it was the gearbox saying to engine to reduce power. Usually comes up with a P0700 though.

If it is a 2.0 or 2.2 petrol, I would say double check cam sensor...

[Ken T]

Just had the Vaux garage back on, they recon its the main ECU and want £650 to fix
I have managed to locate another ECU for a more reasonable £40, but unfortunately there is no key with it, so I can't just swap the ecu/reader/key. I have the car pass for my car but not for the scrap one. Its looks as if I am stuffed
Is there any way of reprogramming a replacement main ECU with a different number ?  

[TheBoy]

Just had the Vaux garage back on, they recon its the main ECU and want £650 to fix
I have managed to locate another ECU for a more reasonable £40, but unfortunately there is no key with it, so I can't just swap the ecu/reader/key. I have the car pass for my car but not for the scrap one. Its looks as if I am stuffed
Is there any way of reprogramming a replacement main ECU with a different number ?  

You should be able to program the new ECU to the old immobilser if that helps?

Though I doubt the ECU has failed, despite what dealer says...

[Ken T]

Thanks for that. One thing Idid notice was that the switching line to the injector was sitting at 3.9v at ignition and when cranking. I didn't have a scope on it at the time, so I didn't see any switching pulses. I will maybe ask the dealer how much he wants to reprogram the new ECU, but I will make sure I have marked it before he gets it. Alternatively do you fancy a quick detour on your journey up to the Lakes?.

[TheBoy]

Thanks for that. One thing Idid notice was that the switching line to the injector was sitting at 3.9v at ignition and when cranking. I didn't have a scope on it at the time, so I didn't see any switching pulses. I will maybe ask the dealer how much he wants to reprogram the new ECU, but I will make sure I have marked it before he gets it. Alternatively do you fancy a quick detour on your journey up to the Lakes?.

Alas, we will be pushed for time, and Cleakheaton is a bit too far off course .  One of my female mates parents used to run a postoffice in Cleckheaton - the Moor End PO one, not far from the big roundabout...  ...spent many a weekend drinking far too much around there

[Ken T]

OK, thanks anyway
Cheers Ken