'87 GTA turbo ignition wiring diagram

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'87 GTA turbo ignition wiring diagram

Postby FATORANA » Wed May 23, 2018 4:22 am

Hi Folks,

Just wondering if anyone has an ignition wiring diagram for an '87 GTA turbo. I have no spark at the coil. To narrow this down, I have replaced the crank angle sensor, I have checked the ignition relay, ecu has been checked and given a clean bill of health, earth checked for continuity from the coil to the top of the strut tower. I have 12 volts at the coil when the ignition switch is on but I only have .15-.18 volts at the 2 pin trigger on the coil, I read somewhere on the forums that this should be about 5 volts. I changed the ignition module/ coil and it started up albeit as rough as guts. It ran for about 4 mins then abruptly died, it has not started since. I have come the conclusion that my second module has blown in the same way as the original one, leading me to believe that there is a short somewhere. An ignition wiring diagram would make light work of the investigation process. Any help would be appreciated.

Thanks folks

Howard
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Re: '87 GTA turbo ignition wiring diagram

Postby clee » Wed May 23, 2018 10:05 am

Hi Howard. PM sent .
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Re: '87 GTA turbo ignition wiring diagram

Postby MFaulks » Wed May 23, 2018 10:59 pm

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Howard,

The test is pretty easy, the ecu driver to the coil is open collector i.e. it pulls the trigger input of the coil pack to 0V to trigger a spark event. So you can do this manually with just a wire and touch it down to ground (trigger pin on the coil pack, ecu trigger connector disconnected of course), with a sparkplug in the king lead you should see a spark each time you do that, ignition on... Done this loads of times, also found intermittent coil drivers this way.... If that works each time you ground the line, your problem is between the ecu and the coil pack. The nominal o/p is closer to 12V than 5V on all the ones I have checked.

Enjoy,
Martin
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Re: '87 GTA turbo ignition wiring diagram

Postby clee » Thu May 24, 2018 7:00 am

Check your messages Howard.
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Re: '87 GTA turbo ignition wiring diagram

Postby FATORANA » Mon May 28, 2018 4:23 am

Thanks Guys,

Martin re the test, have done as you say and have no spark. As mentioned before, this was a brand new coil/module, it ran rather roughly for about 4 mins and then died. Now if I replace it with a third one I run the risk of it damaging it too, so I need to find the cause which I suspect is a crossed wire somewhere.

I will study the wiring diagram Lee forwarded and get back to you if I have any ideas.

Thanks again

Howard
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Re: '87 GTA turbo ignition wiring diagram

Postby MFaulks » Thu May 31, 2018 6:53 am

.
Hi Howard,

Send them to me and I'll test them on the bench. These are pretty robust units from my experience... are you sure you had 12V, and a true ground connection when you were testing? It is one of the worst 12V feed lines in the loom, as it loops both sides of the front cabin to the door pillars (immobiliser options), and goes through multiple connectors before it gets to the coil pack....

As I say happy to test however many you have on the bench & see if and how they have failed, may give you some clues, but very odd...

Regards,
Martin
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Re: '87 GTA turbo ignition wiring diagram

Postby FATORANA » Tue Jun 19, 2018 8:42 am

Hi Martin,

Apologies for radio silence I have been preoccupied and not had time to investigate since last corro. I have 3 coils/ modules, all display the same voltage output at the 2 pin trigger connector on the coil (disconnected). The one closest to the centre of the coil reads 0.06v, the outer one reads 0.15v. I have a clean 12 volts at the 3 pin connector with the ignition on. I will attempt again tomorrow on the bench with direct 12 v battery connection and get back to you.

Cheers

Howard
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Re: '87 GTA turbo ignition wiring diagram

Postby JohnC » Tue Jun 19, 2018 3:04 pm

I don't know if this pic below gives you any more info than you already have, but you can follow the wiring more easily via the colour coding.
Basically with everything connected you should have 12v across pins A & B on the 3 pin connector. ( do not rely on a chassis earth when checking this ....... it must be across the pins )
On the two pin connector, which only has one wire attached ( according to the cct diag, it should be an orange wire) if you have an analogue meter set at approx 10 volts, you should get the meter needle kicking when you crank the engine. The control voltage according to the manual is 5v but it is very unlikely the meter will show 5v as the duration of the pulse is unlikely to be long enough for the meter movement to fully get to 5v, but the needle should kick on each compression. You will not be able to do this pulse test with a DVM.
I hope this helps.

GTA Turbo Ign.jpg
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1990 GTA Atmo, 2003 Jaguar X type 2.5SE Auto, 2018 Kia Picanto GT-Line-S 1.25


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