Recently ran into some trouble when my 1990 ST185 stalled and then wouldn't start. It had been on the road driving perfectly for about 3 months after I put a JDM Gen 2 3SGTE in there wired with the original aus delivered loom and ecu until one day the engine died (no splutter or limping). Since then the car has not started, doesn't even fire. I have done general troubleshooting such as ECU diagnostic and checked for fuel supply and spark to no avail. I have checked vacuum hoses and sensors but all seems to be ok. Before it stopped running I had an issue with a leaking coolant hose at the rear (flywheel end) of the engine, but I have repaired it and the car ran for about a week after the incident. I am now starting to wonder whether the issue is with the ECU, does anyone know how I can test the ECU?