Jump to content
The mkiv Supra Owners Club

Supra won't start. No ignition


dive_popo

Recommended Posts

Hi guys.

 

I have recently an issue with my Supra. I drove it and parked for 2h. Then it refused to start.

 

The supra is a JDM TT BPU auto, with a mines ecu

 

I checked the following :

-fuel is arriving

-battery OK

-starter ok

-no engine codes

-there is no ignition at all

-plugs and coil connectors are new (changed last year and the car done maybe 200miles since)

-sometimes there is an electrical weird issue : i take off the key but the + after contact stays on(no lights on the board but the fuel pump continues to turn and the AVCR stays ON) (no turbo timer in car) I need to unplug the battery to stop it.

 

 

Any help will be much appreciated

 

(I had a similar issue 1 and a half year ago, but I bought an electrical connector cleaner and put abso;lutely on all possible plugs I saw, and it started, I done the same now but didn't helped this time)

Edited by dive_popo (see edit history)
Link to comment
Share on other sites

You'll need to get familiar with a multimeter, the ECU pinouts, and a nice pin probe to check the wires right at the ECU plug. See if it's trying to trigger a spark. If so, check at the igniter, see if that's sending the spark to the coils. Check at the coil pack plug, see if the signals are reaching there. At some point, if all six packs aren't sparking, you'll find a single point of failure, either a voltage feed, a fuse, or an earth.

Link to comment
Share on other sites

For example, check earth point EC, front side of intake manifold, lower runners. Seeing as you've got that strange electrical thing where the fuel pump stays on, my money is on a dodgy earth. Perhaps the bolt has fallen out, happened to me once and took a week to diagnose.

Edited by Ian C (see edit history)
Link to comment
Share on other sites

Thanks guys :)

 

I took all coils out and there is no spark at all, not even one :/

 

Ian could you show me on a picture where this earth is please :) I remember last year when I got the same issue is touched absolutely everything on the intake manifold and it started then the issue disapeard, It might be this !

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.