1JZ ignition module grounding

[sil80 1J]

does anyone know if the ignition module (igniter) grounds itself through the casing to the body or whether there is an earth wire somewhere in the system?
cheers

[wilbo666]

Earthed via Ground wire in the 4 Pin plug.



Cheers
Wilbo

[sil80 1J]

couldnt ask for a better response!!! thanks mate!!!!

[sil80 1J]

what does IG- and IGF on the 4 pin plug mean?

[wilbo666]

IG- is the signal that goes to the dash (and the diag box on the side of the engine), it is the tacho signal from the igniter to the dash.


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......


Hope that helps...

Cheers
Wilbo

[sil80 1J]

awesome!!! thanks for the info mate, thats perfect!

[silver_ta22]

hey heres a related article from supramania, where a guy puts it extra grounding coz his was corroded. might be interesting.

http://www.supramania.com/forums/showthread.php?t=52217

[sil80 1J]

cool cool, should do this as a point of interest even if mine is ok. thanks for the link mate

[sil80 1J]

also... is the power on the 4 pin plug straight from an ignition source or is it relayed? if so what is the trigger for it?

[wilbo666]

also... is the power on the 4 pin plug straight from an ignition source or is it relayed? if so what is the trigger for it?

Pretty sure it is +B power, which is via the master relay, which is triggered from the ECU M-REL output...

Hope this helps...



Cheers
Wilbo

[sil80 1J]

cool cool, thanks mate, its all coming together slowly... i think ill just run it off the same relay i use to power up the coils.
thanks again for your help mate, most appreciated!!

[wilbo666]

cool cool, thanks mate, its all coming together slowly... i think ill just run it off the same relay i use to power up the coils.
thanks again for your help mate, most appreciated!!

Yep that should work fine!



Cheers
Wilbo

[Mos]

Pretty sure it is +B power, which is via the master relay, which is triggered from the ECU M-REL output...

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.

cool cool, thanks mate, its all coming together slowly... i think ill just run it off the same relay i use to power up the coils.

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.

[takai]

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.

Interesting, so thats the reasoning for it.... Never knew that.

[wilbo666]

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.

Mos.

Hmm I thought it was +B for the igniter, but maybe I'm wrong Ah that's right (Looking at the diagrams) the igniter is always labled with +B, but it is actually switched via the ignition...! I can understand how I forgot it was switched ignition and not really +B

Anyway sorry for the bum steer, and thanks to Mos for correcting me

Also as mos says the injectors def aren't on +B so that gives you the safety (regardless of the igniter I feel )...



Cheers
Wilbo