Toyota Coil on Plug Guide

Technical Guides primarily to do with the NA series

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bartmanftw
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Toyota Coil on Plug Guide

Postby bartmanftw » Wed Feb 18, 2015 4:23 pm

This guide is for wiring up toyota coil on plugs on a na6 wiring loom.

Parts required:
Toyota connector plugs
Part numbers for coil packs:
90080-19015
90919-02239
90080-19023
90919-02234
Part number for connector housing
90980-11885

Crimp pins
I got mine from here: http://www.bmotorsports.com/shop/produc ... ts_id/1567

16awg wire (different colours optional)

3 pin pigtail from the original coil pack

There are four pins on the Toyota coils that need to be connected to the engine bay wiring harness. Each one needs a wire for 12V, ground, trigger and tach signal. The two trigger signals and 12V are supplied from the original 3 pin coilpack plug, the coil packs are grounded directly to the cylinder head and the tach signal needs to be wired back to where the OEM ignitor was. Each Toyota coil pack has it's own ignitor circuit inside so the stock one can be binned. Two sets of wires need to be jumped on the original connector to get a trigger signal at the original coilpack plug. A 1k resistor is also required to be placed over the IG- and B+ pins in the diagnostics box to get the tacho to work.

Image

To connect the wires together you can either solder them or use crimps. The red, white and blue wires are found on the 3 pin pigtail from the original coil pack while the yellow/blue and black/white wires are found on the ignitor plug pins 5 and 4. Coils 1 and 2 do not need tach signal wires unless running sequential spark.

Image

Wires numbe 8 and 7, and 1 and 2 need to be connected together.

Picture of my completed loom without any wire insulation.

Image

speed
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Re: Toyota Coil on Plug Guide

Postby speed » Tue Feb 21, 2017 12:07 pm

Since I've recently used this guide to install mine, I thought I'd add some info that I found along the way that was helpful to my non electrical mind.

The above wiring diagram shows the correct orientation when looking down on the connector for the coil.

The following pic further explains each pins function.

Image

1. Earth
2. Trigger
3. Tach
4. 12v

If you are going to use the original 3 pin connector from the old coilpack, it is worth noting that the colours of the wires are different at the coil end compared to the loom end.

Above Alex refers to the loom end as white, red and black.
The coil side has black, white and red.

So the coil end is as follows;:

Black - trigger cylinders 4 and 1 (goes to white on loom end)
White - trigger cylinders 3 and 2 (goes to red on loom end)
Red - 12v (goes to blue on loom end)

To get the tacho to work, you either need to run an additional wire or jump pins on your ecu.

I chose to run an additional wire. Run from tach wires from cops on cylinders 3 and 4 and connect them to the yellow/blue wire on the igniter. It's pin no. 4

You also need the 1k resistor in the diagnostic box as described above.

You will also need to run a further wire from the cops for the ground (na8's have one in their 4 pin looms).
So you basically have the 3 wires in the connector and 2 additional wires for tach and ground.

Connecting pins 1 and 2, 3 and 4 together in the igniter is so that the car will actually run. The reason you disconnect the stock igniter is because the cops have them built in.

The dwell settings for cops is 2.5ms with cranking of 3.5ms. Although the cranking can be set higher.

If you've done the above and your car still doesn't run properly, then you've either made an error or something else with the car/coils is not right.

If you're now using forced induction, you'll need to run a colder spark plug, so go from bkr6e to bkr7e and gap between 0.81 to 0.89
If boosting to 15 psi or higher use 0.80

Hope that helps and thanks again Alex for answering all of my questions.


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speed
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Re: Toyota Coil on Plug Guide

Postby speed » Tue Feb 21, 2017 1:04 pm

I'm so happy with the outcome, here's a pic of mine :)

Image

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bruce
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Re: Toyota Coil on Plug Guide

Postby bruce » Tue Feb 21, 2017 2:26 pm

Neat and pretty! Good job.

speed
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Re: Toyota Coil on Plug Guide

Postby speed » Tue Apr 11, 2017 5:03 pm

Speeds boosted + dead time

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bartmanftw
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Re: Toyota Coil on Plug Guide

Postby bartmanftw » Thu Apr 13, 2017 12:30 am

I should add that the easiest/best way to get the tacho with these coils or any other for that matter is to connect a tach out signal from your ecu (assuming it has that capability) to pin 2I (4K on DIYPNPs). This sends a tach signal up to the ignitor connector which then can be sent straight to the dash cluster by connecting 4 and 5 which are black/white and yellow/blue. This also means that if you ever hit some sort of ignition cut your tacho won't go spastic since it's dríven from the ecu by the cam/crank angle sensors rather than from the coil packs firing.

Red_Bullet
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Re: Toyota Coil on Plug Guide

Postby Red_Bullet » Thu Apr 13, 2017 6:19 pm

I hadn't thought of ignition cut sending the tach off, so yeah, makes a lot of sense to use ECU tach out signal!

manga_blue
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Re: Toyota Coil on Plug Guide

Postby manga_blue » Thu Apr 13, 2017 6:38 pm

speed wrote:The dwell settings for cops is 2.5ms with cranking of 3.5ms. Although the cranking can be set higher.

That's not quite right. Dwell time is the period in which the COP is recharged prior to the next firing. The right amount of charge is determined by both dwell time and voltage. Excessive dwell time or voltage will cause coil overheating and premature failure. Inadequate dwell time or voltage will lead to a weak spark and loss of power.

It's better if you can apply a table of dwell vs voltage or dwell plus a correction for voltage. miataturbo.net discusses this with some examples at http://www.miataturbo.net/megasquirt-18/dwell-observations-toyota-cop-44131/ .

By way of example supply voltage at the COPS on my car varies from 14.4V at 1000rpm down to below 9.0V near redline. This has pretty significant effect on optimum dwell time. My dwell time should vary from 25msec to over 50msecs depending on engine speed.
’95 NA8


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