Crank no start, Single injector Pulse?

The vehicle listed above has an inline 4 COP ignition system with an engine code of 4G64 SOHC engine installed in it was pretty okay. Thus, the client used it for some errands from the morning hours to the afternoon and it was perfectly running. Nevertheless, when the client returned home the 3rd time, his boy reversed the vehicle within the man's compound for a wash. If I'm not mistaken though, the car stalled on him, or it was about 20 minutes ago when the boss was about to move again with the car that they noticed the problem. But they said it was only a reverse he did.
The car would crank, start but stall immediately within 4 seconds. I was called to rectify and fix the issue.
One of the things I checked when the car was cranked was the fuel system. With ignition on, the car wouldn't pump even an iota of fuel through the fuel hose to the engine.
Bypassing the pump directly to the battery positive and ignition switch to the on position, there's a great pressure or amount of fuel from the fuel hose. Alternatively, I unplugged and plugged back the 3 wire CKP sensor connector and noticed a great buzz of fuel too. I proceeded with testing fuses and relay from the engine bay and only one fuse was bad, and it was replaced. From inside the car, I all relays and noticed that the CKP sensor no longer pumps fuel to the engine with the unplugged and plugged method but the bypass method and noticed the relay location that controls the CKP fuel pressure buzz on ignition to the battery positive still wasn't affected. I didn't know more to do there than swap the relay.
Next, I checked for injector pulse and noticed only a single or no pulse at all.
I tried to hook up a scanner to conduct some tests, however, the scanner was not connecting.
Next, I checked and observed that the timing was pretty weak. I showed the client, he said I should replace it which I did.
Presently, it's a crank no start, single injector pulses no spark, no communication to my scanner.
Please, how can I address these issues? How can I bench test the car 3 wire CMP, CKP sensor with a multimeter or a test light or LED light outside the car? Where is the fuel pump relay location? Please send me the car wiring too, referring to the no start most likely.