Please help - the Ignition control unit is just clicking

[Penelope Stopit]

thomas.moeller said:

Penelope Stopit said:

Are you ok at working through diagrams?

Yes, working through diagrams is fine.

Finding the wires and connetors on the car is something different

Ok Then

notaping said:

If you haven't already looked here - you'll find all the wiring diagrams at http://tvr-cerbera.co.uk/wiringdiagrams.html

The one you're interested in is CEPD003C Rear Harness Part 1.jpg. Up at the top left you'll find the Ignition ECU. Check the signal on 'Starter Drive' (W/R) when you press the start button. If you get a signal, then that ECU's ok. Move on to the Immobiliser ECU. W/R in - check the signal's ok there. W/R out - check the signal's ok there. Move on to the fuse box and the starter relay - CEPDF81A Fusebox.jpg

Unfortunately there are no shortcuts in something like this. Just methodically plodding through it. However, as a guess I'd say the timing circuit in the Ignition ECU is suspect. If the capacitor in the timing circuit has failed - the delay would get longer as the capacitor was failing and finally give up the ghost altogether. You've indicated the start delay got longer before it finally stopped working. Open up the Ignition ECU and look for any suspect capacitors.

Good luck :-)

Is the only way

[RUSSELLM]

thomas.moeller said:

RUSSELLM said:

Ok.

I take it from that, that when you press the start button, you’re not getting the switched 12v+ to the immobiliser ?

Edited by RUSSELLM on Friday 24th July 08:48

I'm not sorry, what wire on the immobiliser you are refering to? Is it the "Green 15/30 " in position 1 or the "Red 30+" in position 2?

I’ve sent you an email on fault finding that circuit.

[thomas.moeller]

notaping said:

If you haven't already looked here - you'll find all the wiring diagrams at http://tvr-cerbera.co.uk/wiringdiagrams.html

The one you're interested in is CEPD003C Rear Harness Part 1.jpg. Up at the top left you'll find the Ignition ECU. Check the signal on 'Starter Drive' (W/R) when you press the start button. If you get a signal, then that ECU's ok. Move on to the Immobiliser ECU. W/R in - check the signal's ok there. W/R out - check the signal's ok there. Move on to the fuse box and the starter relay - CEPDF81A Fusebox.jpg

Unfortunately there are no shortcuts in something like this. Just methodically plodding through it. However, as a guess I'd say the timing circuit in the Ignition ECU is suspect. If the capacitor in the timing circuit has failed - the delay would get longer as the capacitor was failing and finally give up the ghost altogether. You've indicated the start delay got longer before it finally stopped working. Open up the Ignition ECU and look for any suspect capacitors.

Good luck :-)

I looked a little more a the wire diagram and need to do a bit more testing, I guess

[thomas.moeller]

Problem solved

I found a shortage between the wires marked with red and Green below. Therefor when pushing either of the buttons the result was the same, the system was "asked" to start and stop at the same time which caused the "flicking".

Good to be on the road again.

Thanks, to all the ideas and support provide from your all. Very much appreciated.

[hoppo4.2]

bringing back a really old thread but my car just started doing the exact same thing last week. where did you find this short between the wires

[thomas.moeller]

The short I found was near the circuit board below the steering wheel. Good luck with sorting your promblem.

[hoppo4.2]

thanks I'm on it today so I'll start there