Engine will not crank with key

Hi,

You indicated the starter relay is good. Here is how this system works. The ignition key in the start position signals power through the neutral safety switch which goes to the starter relay which is grounded through the PCM. Once that circuit is completed, the relay is energized, and the power goes from fuse 101 to the starter solenoid.

Start by checking fuse 101 in the central junction box (under the dash/driver's side). In addition to checking the fuse, confirm there is power to and from it. Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If that is good, I would recheck the relay. If you haven't already, switch it with a different one in the box having the same part number. Or here is a link that shows how to test a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Make sure the relay and pins it mounts to are clean and in good condition. Make sure none of the pins in the box have been pushed down preventing the connection.

If that is good, remove the relay, and with the key in the start position, check for power and ground using a test light between pins 85 and 86. Remember, the PCM is what completes the circuit by providing a ground. So, you need to be connected between those two pins. See schematic below.

If that checks good, then we need to confirm power out at the yellow wire with a light blue tracer. You can check that right at the starter. It runs between the relay and S terminal on the starter motor.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below. Note: I had to cut the schematic in half to make it readable for you. I did overlap them so you can follow from one to the next. The last pic shows the location of the fuse in the CJB.

Hi,
It could be an adjustment-related issue. The only suggestion I can make is this. When parking the truck on an incline, while the vehicle is in gear or neutral, engage the parking brake until it holds the vehicle in place. Then place it in park.

I suggest that because I have seen cables stretched from trying to pull the gear from park when it's on a hill. There is a lot of pressure that is placed on the parking sprag in the transmission.

As far as the adjustment, I attached the directions below. Take a look through them. It wouldn't hurt to check the present adjustment. It could be slightly off.

I hope this helps. Let me know if you have other questions or need anything.

Take care,

Joe

See pics below.