Help T-Sport Still Blowing Main Fuse

[wully_fae_glesga]

Were do i start lol celica is blowing main fuse to start car. i have since been to visit auto spark was diagnosed as faulty air con compressor that has now been changed and toped up and we still have problem. revisted auto spark and he checked the wiring (so he says) and said its fine. now its become a major problem because i need car for work and i really dont want to visit MR T dont have funds for there services. ANY IDEAS OR SOLUTIONS PLZ LET ME KNOW THANKS PS I ANT GOING ANYWERE FAST LOL

[edwardio]

I would have thought that its your starter shorting out or its along your ignition line somewhere.

Very strange though & I hope you sort it.

[GT4 BOOSTER]

take the live off the starter motor and turn the key to start car , if the fuse dont blow but then blows on reconnection its likely to be related - you basically need to disconnect things and try it , you will find the culprit eventually.

i wont of thought it would be the aircon as thats off untill you engage it via the dash board switch

[Ian Cass]

I usually don't like resurrecting old threads, but my wife's car recently suffered from this problem. I couldn't find any info on the net, so I diagnosed and solved the problem myself. I'm posting here just to help others.

UK Celica T-Sport with the 2zz-ge engine has a secondary air-pump that's connected to the same fused circuit as the starter motor solenoid. To accommodate this, "main fuse" is uprated to 50amp rather than 40amp. This secondary air-pump circuit does not appear on any Toyota circuit diagrams I could find except for service bulletin EG-1012 (teg-1012.pdf). Unfortunately, this means that if the pump jams, it will draw a huge current and the main fuse will blow, meaning that the car won't start. I guess Toyota realized their mistake because on later models this pump is on its own fused circuit (and starts to appear on circuit diagrams).

So, if your main fuse is blowing, unplug the secondary air pump, replace fuse and see if it solves the issue. If it does, you need a new pump. You can find the pump under the plastic engine cover to the left of the engine bay. From what I could tell, the same Denso pump is used on the Celica, Corolla, and Honda s2000. My wife's car now has this Honda part and it appears to work well.

Hope that info helps someone.