2.5L ('98-'01) Camshaft Sensor

[JHY]

I have a 99 ranger xlt with a P0340 code (Camshaft Position Sensor) the truck runs fine at idle but it bogs down when it’s under load. I’ve replaced the camshaft sensor and the code is still there so I started looking at the wiring and I don’t have any voltage to the sensor. I checked both wires for continuity. The ground has continuity and the hot goes to pin number 85 has continuity so I figured the ECU was bad and I ordered a new one and replaced it and I still have the same issues I have to be missing something any help with this would be greatly appreciated. On a side note I’ve also replaced the alternator

 

[franklin2]

If the ECM was bad, you would have many, many more codes than just one. Pin 91, the grey/red wire supplies power to all kinds of different sensors. I think I would find that splice 103

and look at that wiring.

 

[scotts90ranger]

Being two wires the sensor is most likely variable reluctance or VR which doesn't matter but it basically makes it's own voltage so one wire will be a ground and the other will be a voltage signal to the computer, if 3 wire it would be power ground and signal, Ford likes their VR sensors...

That said I would still check that grey/red wire for ground and possibly continuity from the other to pin 86 of the computer.

I would also check that everything is lined up, if you put the crank on TDC and pull the timing cover (I know it's a pain, I think you can check everything through the plug on the front) there's a diamond and triangle on the cam and cam sensor pulleys that need to match their corresponding marks on the inner timing cover.

 

[franklin2]

Being two wires the sensor is most likely variable reluctance or VR which doesn't matter but it basically makes it's own voltage so one wire will be a ground and the other will be a voltage signal to the computer, if 3 wire it would be power ground and signal, Ford likes their VR sensors...

That said I would still check that grey/red wire for ground and possibly continuity from the other to pin 86 of the computer.

I would also check that everything is lined up, if you put the crank on TDC and pull the timing cover (I know it's a pain, I think you can check everything through the plug on the front) there's a diamond and triangle on the cam and cam sensor pulleys that need to match their corresponding marks on the inner timing cover.

I think he is correct. Pin 91 is not a 5v supply but is a signal ground. So you will not get voltage on the grey/red wire. If it is also true about it being a varying reluctance sensor, you should be able to take it out, put the sensor on a meter set on AC volts, and turn it with you fingers and get a voltage output. The old meters with the needle work best for this, but you should get something on a digital meter also. The faster you turn it, the more voltage you will get, and you may see the needle on the meter bob back and forth if that is the type of meter you are using.