1JZ ignition module grounding

[Mos]

Where's the ignitor in that diagram? Are you sure you're not thinking of the diagnostic connector?

This is from the JZA80 manual. Ignitor and coils:





And injectors:





Mos.

[wilbo666]

Yep realise I had muffed my post as soon as I put it up

Should be right now (You might need to refresh ur cache tho...)

Also further to my defence you'll notice in my marked up pic of the igniter pins (Above) I call it 'IGN PWR' and not +B, so in the past I was aware that the +B label on the schematics / wiring diagrams was misleading, at least to myself

Cheers
Wilbo

[sil80 1J]

It's not. +B is the output of the EFI relay, which supplies the ECU, fuel pump and things lile VSVs, ISCV, etc but not the injectors or ignition system - those usually come through the AM2/IG2 circuit, mostly directly through the ignition switch, sometimes through an IG2 relay.

While the EFI relay is often controlled by the ECU, the injector/ignition power supply is separate and controlled by the ignition switch only. Part of this is so that if something fries the ECU so it's constantly supplying the M-REL signal, you can still shut the engine down by turning off the ignition switch.

Yep, as wilbo said that will be fine, as long as it's triggered off the ignition switch and not the output of the EFI relay.

Mos.

i triggered it using power from the ignition wire into the ecu ie ignition power before the ecu, should work as you explained, good point with the shut down of the engine if the ecu fries!!

[sil80 1J]

For future reference 1J fans, if you change your computer there are not many if any that can drive the factory Ignition Module. Unless someone knows a trick you will have to go with an aftermarket module. Might save someone 8 hours in diagnosis of no spark problem...(like myself)
Cheers

[wilbo666]

For future reference 1J fans, if you change your computer there are not many if any that can drive the factory Ignition Module. Unless someone knows a trick you will have to go with an aftermarket module. Might save someone 8 hours in diagnosis of no spark problem...(like myself)
Cheers

I'm not sure what your problem is, but I've tested and found the 1JZGTE ingiter to be a 'dumb' igniter...

Any aftermarket ECU should be able to send the signals to drive it! It is very simple...

Did you try the following?

I.e.
On 'A' Plug (4 pin)

• 1 = To Tacho
• 2 = Ignition Power (+12V when ignition on)
• 3 = Not used in aftermarket engine ECU application
• 4 = Ground

ON 'B' Plug (12Pin)

• 1 = Trigger signal from aftermarket ECU, when voltage goes high, coil dwell starts. When voltage goes from high to low 'spark' is triggered!
• 6 = To coil -ve. 'Igniter' output...
• etc for other cyls

Cheers
Wilbo

[JZA70 R]

IGF is the ignition verification signal wire that goes from the igniter to the ECU. This wire / signal is used to tell the ECU if the ignition event was completed successfully as far as the igniter could tell......

is there anyway to bypass this wire or remove it without the ecu going into limp mode or triggering the CEL ?
(bypassing ignition feedback)

[wilbo666]

is there anyway to bypass this wire or remove it without the ecu going into limp mode or triggering the CEL ?
(bypassing ignition feedback)

Sure is, this thread below may help

http://www.toymods.net//forums/showthread.php?p=730738

Cheers
Wilbo

[JZA70 R]

Thanks, but can you explain that to someone not so good with electronics?

[wilbo666]

Thanks, but can you explain that to someone not so good with electronics?

I can try? lol

• Get the signals that go to the igniter from the ECU (IGT1,2,3,4,5,6) and connect a diode to each one (Almost any diode will work, 1N4004 would be fine)
• Connect the ends of the diodes that doesn't go to the ECU together to a resistor, say around 4k7Ohms would be my suggestion.
• Connect the other end of the resistor to the base of an NPN transistor (Again almost any transistor will be fine, BC337 should be fine)

Cheers
Wilbo

[JZA70 R]

does the transistor then connect back to IGF to complete the circuit?

[wilbo666]

Yes, the collector of the transistor connects to IGf on the engine ECU.

Cheers
Wilbo

[sil80 1J]

everything was looking good, was using the computer's (autronic) 3 channel outputs and the 6 ignition module outputs to the coils, power was everywhere it needed to be and signal was leaving the computer but the module was not triggering the coils, spoke to a dude and he said the modules cant deal with linking 3 channels of the computer to the 6 channels of the module. Aftermarket one works fantastically though. Is there a way around that? I spent a fair few hours trying to make it work

[wilbo666]

everything was looking good, was using the computer's (autronic) 3 channel outputs and the 6 ignition module outputs to the coils, power was everywhere it needed to be and signal was leaving the computer but the module was not triggering the coils, spoke to a dude and he said the modules cant deal with linking 3 channels of the computer to the 6 channels of the module. Aftermarket one works fantastically though. Is there a way around that? I spent a fair few hours trying to make it work

If the Autronic only had 3 channel output, then you need to setup wasted spark...

1,5,3,6,2,4 -->

So you would have a wire for spark for the following cylinders leaving the Autronic...
1 & 6
5 & 2
3 & 4

So I'd have the wire from the Autronic that controls spark for cyls 1 & 6 going to the two corresponding IGt trigger pins on the igniter (i.e Plug B, Pins 1 and Pin 7). I'd do the equivalent for the other wires...

Did your tuner do that, or?

Personally I haven't tried it, but I see no reason it would not work...

Cheers
Wilbo

[sil80 1J]

yeah i had 1 and 6 together, 2 and 5, 3 and 4 together, that is what the module cant deal with, it needs 6 separate pulses otherwise it gets confused, you would have thought it would just actuate 1 and 6 together when told by the ecu but apparently not.
i wired it, not the tuner as per that info listed earlier this post or in another i inquired about but was not to be, just thought ide put it up here so no one else wastes time with it unless there is a way around it

[wilbo666]

Interesting,

I wouldn't have though it would be an issue, but there you go.

If one day I have the time I might get around to testing it

Cheers
Wilbo