Hi,
Found some time to look at the Supra today. Jumped in the car and it started straight away and ran again for 2 to 3 seconds then dies.
Anyway shorted the diagnostics plug, but it showed no faults, but the engine check light pulsed constantly, along with the overdrive light on the dash!
Looked at the diagnostics document on line for the engine and noted that stalling directly after start up could be the 'fuel control circuit' I have checked that there is 12V being fed to the pump contol computer in the boot, and there is a constant 4.5v at the same plug (pins 1 & 3) when cranking. Finally I shorted the diagnostics plug to check to see if the pump ran and I can hear it clearly in the boot. Bad light stopped play, so I forgot to get my wife to start the car as I listened to hear whether the pump stopped when the engine cuts out, or attempts to carry on pumping fuel? The diagnostics char stated it could then be the ECU, but I'm not convinced, as if the ECU had died, surely the engine wouldnt run normally for the first few seconds? Any thoughts where to look next?