Code P0343, CAM sensor

That code refers to:

"DTC P0343 Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1".

So it will be the Intake camshaft on the RH (passenger side).

The Circuit high message means that either the sensor has failed, or an open circuit exists (broken wire etc).

Happy hunting!
Jon

Intake!

Let us know how you're doing!

Jon

Okay,

I don't believe the sensor to be the issue, to me, what you're seeing is a wiring problem. I won't have access to schematics until I get home tomorrow. Then I will help you troubleshoot this further.
Jon

Hi Pete,

Sorry for the slow reply. I am having a hard time getting to the schematics for your vehicle. I'm trying to sort that out, hopefully soon! With all of the codes you posted, I am beginning to think that the crank sensor may have something to do with this, or perhaps a wiring issue that is common to both of the sensors reporting errors. I'll see if I can have someone post the schematics up here until I get me access fixed.

Jon

Hello just to help, I was able to dig up this diagram. So you see the plain red wire should be battery voltage, the brown/white wire should be a pulse with your test light while cranking. The pink/black wire should be sensor ground. Hopefully this diagram is correct.

All of the cam sensors share the 5 volt reference (Gray wire) and ground circuits (Tan wire). From the description it sounds like one or the other has a bad connection as that would cause codes on all of the sensors. If you have a voltmeter the easiest test would be to connect it to a good ground, Then remove the connector from the sensor you removed. Use a small pin to connect the positive probe to the Gray wire. You should have 5 volts with the key on. Now start moving the wiring that goes to the sensors. You don't want to see the voltage change regardless of how you move the wires. Now remove the pin from that connector and put it back on the sensor. Remove the connector from another cam sensor and connect to that gray wire. You should still have 5 volts. This will show you if that sensor is shorted. To test the ground circuit is a bit harder, you need to connect the meter in the Tan wire and the 5 volts on the Gray wire, Then move the wires like you did before. Again you don't want to see the voltage change or drop out.
Being these are all circuit codes it isn't likely to be the sensors themselves, it is in the wiring to them. Either a broken or corroded wire. Being that you suddenly got all of the new codes after you removed the first sensor suggests it is close to the splice for all of the power or ground wires. I'm thinking it may be the 5 volt circuit as the ground side is shared by other sensors as well and those should be showing problems as well.

My thoughts exactly, just hard to describe without the diagrams!

Jon

The first part is the original design part. It has been discontinued by GM for a while so rebuilt and used are about the only sources for it, the second is the updated part that replaced it due to the issues they had with the first design.

To use the newer part on your engine you also need to replace the wiring harness connector ( ACDelco #88988585) and use gasket #12581398.

That would be the reason alright. In that case you want the later part but check the wiring as well, I have seen a couple where the wire splices corroded inside the insulation. What problem are you having?

That's an out of range code, usually from an open circuit. It could also be related to the cam signal issue you were having, as the ground circuit in the PCM is a common buss that they share and if it was lost the TPS would signal out of range.