Truck in limp mode

Good evening.

Does the engine not start?

you need fuel, spark and compression to run.

have you checked for spark and fuel pressure?

Roy

It turns but will not fire. No spark or fuel though it is a new fuel pump.

Okay, I sent two diagrams for you to view. check the fuses in each diagram for power on both sides with the key on.

Roy

Okay checked all of the fuses and relays and still in limp mode so going to try replacing the crank position sensor today and hope that works. Any other ideas would be appreciated. Thank you for your time.

It is possible but a way to check is to crank the engine and see if the tach moves up while cranking. that will tell you if a signal is getting to the pcm.

Roy

Okay put in a new crank sensor and still no luck. No spark so any other ideas?

Okay, can you check the voltage on the positive side of the ignition coil?

Roy

I will try that today. Thanks

Keep me updated.

Took a few days break from this truck but now can say no voltage to ignition coil

OK Can you test for voltage at the ASD relay with the key on?? This relay provides power to the coil and the fuel pump.

Roy