My V6 was running smoothly yesterday, then 20 minutes later would not start. It cranks over, and has a spark. Eventually find no injector pulse. The fuel pump is working. The imobiliser red LED has gone out. I checked fuses, swapped relays - no change. So check for error codes, only get 12. Any suggestions (apart from PCM dying)? I presume if crank angle sensor were defective, it should flag an error code. One thing, when trying to start, I hear a faint chirping sound in the engine bay. I never noticed this before.