Which sensor did you unplug? The crankshaft position sensor, (CKP), is on the back of the engine block, and the camshaft position sensor, (CMP), is on the driver's side of the cylinder head.
Normally you need both of them to be working for the ASD relay to turn on. The Engine Computer turns the ASD relay on for just one second after turning on the ignition switch. That's to run the fuel pump to insure fuel pressure is up for starting. It turns that relay on again during engine rotation, (cranking or running), and it knows that by the pulses it receives from the cam and crank sensors. Normally it will turn that relay off when the signal is missing from either sensor. It wasn't until around 2001 or 2002 that some engines would run with just one sensor working.
The ASD relay sends current to the ignition coil pack, injectors, alternator field, oxygen sensor heaters, and fuel pump or pump relay, so if it doesn't get turned on, the engine won't run. You won't have spark or injector pulses. You will still have fuel pressure due to that one-second burst when you turned on the ignition switch.
Friday, February 14th, 2014 AT 2:01 PM