popennell

Here's what I've got: 98 stang, 3.8L , mileage around 65k.

The MIL came on, throwing code P0340 (Camshaft Position Sensor Circuit A Bank 1). Like a fool, I replaced the CPS because it was cheap and easy, reset the code, and two engine cycles later, the MIL was on again. A little homework revealed problems with plugs/wires, so I replaced both with OEM parts from the dealer (ouch). Two cycles later, the MIL comes back on.

I visually inspected the wiring for the CPS as best I could and I don't see anything that really screams at me that there's a problem.

I found somewhere that Ford released a TSB on this back in 99, but haven't been able to find a copy of it to verify. I know I'm WAY out of warranty here, but I'm curious what they found to be a problem.

I'm not sure of what else to check; where do I go from here? I found posts here on the 4.6L (newer models) suggesting alternators, but I'm not sure it would be applicable to this year/model.

Any suggestions would be appreciated.

popennell

Oh, I left out: I'm not currently having any other problems with the car... no rough idling, no drop in fuel economy... nothing.

sIx

Is the code still pulling P0340?

Causes:

A code P0340 could mean one or more of the following has happened, to the circuit OR sensor..:

• a wire or connector in the circuit could be grounded/shorted/broken/high resistance
• the camshaft position sensor may have failed
• the PCM may have failed
• the crankshaft position sensor may have failed

Solution(s):

With a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

• Visually inspect all the wiring and connectors in the circuit
• Check for continuity in the circuit wiring
• Check the operation (voltage) of the camshaft position sensor
• Replace the camshaft position sensor as required
• Check the crankshaft position circuit as well
• Replace circuit wiring and/or connectors as required
• Diagnose/replace the PCM as required

popennell

Thank you for those suggestions, but I'm already aware of that information, which was posted on the obd codes website. What I'm looking for are some suggestions that might take into consideration the fact that my vehicle is throwing this code and, as far as I have found from voltage tests on the sensor, inspections of the wiring, and general operation of the vehicle, there are no symptoms of failure.

The car runs perfectly; no missing, loping, stuttering, shuddering, or dragging during rapid acceleration, but I continue to get the code after two engine cycles.

So, where do we go from here? I don't suspect the synch because, it seems to me, that would adversely impact my vehicle's performance. Any thoughts?

RyansQuick6

have you done any modifications to the car at all? I can give you the pin outputs on the harness, but I'm offshore right now, I'll be back home in about a week.

popennell

No mods whatsoever...off the top of my head, the only parts on the car that may not have been installed by the dealer are the fog lights and the cd changer, but those were installed long before the MIL started burning.

I'm at my wits end with this; I just don't want to have to take it to the dealer. I can feel it in my bones, a mechanic lays in bed each night praying that I'll come in and help him make the next mortgage payment...

neo8222

id say that you've got some bad wiring somewhere

bbbilly426

i just got a 95 3.8l and have same issues. i would like know where the sensor locate on my motor. so i change out myself.