I have a OBD1 P28 with an S300v3. I am struggling to figure out what components allow the injectors to fire negative pulse on the ECU. I have diagnosed the problem to be the ECU after checking the fuel pump is priming, fuel pressure gauge is installed and has fuel pressure. Spark checked and is strong. test light used to check for pulse from ECU side. 12v checked on injectors. With key on A1 shows 12 volts, on crank 0v and single pulse on ground. Ecu showed code 6 checked and replaced ECT wiring and switch. after looking at the board I changed c21, after this I got code 10 as well (IAT). This is a new ECU purchased from HAMotorsport through CPL racing. I have if for about 3 months now. The ecu together with the S300 went to hondata as I had an issue before and the hondata board has been replaced. I cannot and do not want to sent it for Repairs due to high shipping cost and am hoping I can get some help to resolve the issue myself. I am waiting for a P06 ecu to arrive and while that is on its way I am impatiently wating to tune and drive the car. any help advise would be most apreciated. I am do have other ecu that I can swap components with where possible. Also added addional ground wire to A23 to ensure suffecient ground to injectors and checked earth less the 1 ohm on engine and thermostat. I have attached pics of the ecu where I picked up some damage not sure if this could be the cause of no ground injector pulse and how to fix or if I need to look elsewhere.