5 GT Turbo AEI/TDC Testing?

[Adey]

Ok all, im trying to get a spark from my car that im building up. im getting 12.5 volts to the aei down the wires. i can also read the same from testing on the terminals that you can get too through two tiny slots on the case. On cranking im getting no spark, from the tip of the coil id expect to see a shit load of volts but i only see a max of 12 there? so im thinking the coil is fecked or the tdc sensor is and not giving it a fire signal. Anything else i can check? are there any reading for the tdc sensor?

thanks in advance

adey

 

[Mart]

Good earth at the aei as well?

Unless you've got HV probes, I wouldn't recommend trying to measure the coil's output...

Very rare that the coil fails, so check/eliminate the TDC sensor first - A resistance check across the pins should confirm all is ok, but I can't remember what it should be. I'm sure it's listed in the Haynes manual though. Couple of hundred ohms rings a bell...?

Make sure there's no sh1te on the sensor pin as well.

If all ok there, measure for resistance on the coil output & aei terminals. Alas, I can't remember those values either...

 

[Red21]

Tdc pick up is around 250 ohms +/-50.
What I will do is scan a diag chart & download it to resources when I get back tomorrow night.

 

[Adey]

Legend cheers

 

[Adey]

Bit off from 250 on my trusty screwfix multimeter

 

[Adey]

I tried removing the tdc, cleaning it off and replacing. I then hard wired the aei to the battery and tried again but still nothing. What's your guys thoughts?

 

[DaveL485]

I tried removing the tdc, cleaning it off and replacing. I then hard wired the aei to the battery and tried again but still nothing. What's your guys thoughts?

Its broken?

 

[Adey]

COCK

 

[DaveL485]

COCK

Try the tdc line on another car? Anyone local?

 

[Adey]

asked on facebook tosee if any locals could lend me one and an AEI for testing

 

[Red21]

Just up loaded the first part of the AEi testing, will try & do the rest later.
http://turborenault.co.uk/resources/51/

 

[Mart]

Nearly half a Meg resistance tells me the sensor is at fault.

 

[Adey]

yep, read the document that @Red21 put up, states 200 +-50 so ordered a new one up. hopefully will sort it straight away cheers

 

[Red21]

Just uploaded part 2 of AEi testing.
http://turborenault.co.uk/resources/52/

 

[Adey]

cheers for the info @Red21 great help

 

[DaveL485]

Just uploaded part 2 of AEi testing.
http://turborenault.co.uk/resources/52/

Top notch stuff Rich, thanks!

 

[Chris Sadler]

Im a novice on the AEI unit what does it do exactly ?

 

[Red21]

Im a novice on the AEI unit what does it do exactly ?

It is basicly a mini computer with a crankshaft pulse target that replaces traditional points & condenser and controls the ignition timing/HT sparking via pre programed ignition curves on engines with a carb.
On injection versions it translates the firing pulses from the ECU to trigger the HT coil.

 

[DaveL485]

Im a novice on the AEI unit what does it do exactly ?

It's basically a half-way step toward EFI. It's a (very basic) computer that controls the ignition only.