PCM Connection

[Polak]

I have been chasing this wiring gremlin (P0343) for the better part of a year now and it's really got me against the ropes. Here's what I've done so far:

 

1.) Replaced Cam Position Sensor (Code Still Active)

 

2.) Followed the entire troubleshooting flowchart in the Helm's manual (All tests pointed to failure in the PCM)

 

3.) Replaced PCM w/ a Wester's Tuned PCM (Code Still Active)

 

I'm down to a potential connection issue. So my question is. Are the connectors (i.e.- terminals/ male & female pins) available for me to purchase and replace or am I now to a point that I have to take it to a shop?

 

Thanks,

AJ

[GM-Tech]

We do have the terminals available to us for terminal replacement, but I'm going to guess that most service departments keep these things out in the shop and not in the parts department, just like we do. We have like 20 differet trays, each with a dozen or so compartments, all with different terminals in them. It's a real nightmare finding a terminal you need and they can't just look it up in parts.

 

So, it really depends on your dealer, as to whether or not you can purchase them over the parts counter. You'll probably need a sample of the actual terminal you need for comparison purposes.

 

 

Here's some diagnostic aids on that DTC. Dunno if it will help...

 

----------------

 

The following conditions may cause this DTC to set:

 

• Camshaft reluctor wheel damage

 

• The sensor coming in contact with the reluctor wheel

 

• Foreign material passing between the sensor and the reluctor wheel

 

Using Freeze Frame/Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass or a fail. Operate the vehicle within the same Freeze Frame conditions such as RPM, load, vehicle speed, temperature, etc. that you observed. This will isolate when the DTC failed.

 

The CMP sensor output can be tested. The sensor must be supplied with a power and a ground. The engine must be cranking to perform this test. You can measure the duty cycle at the signal circuit of the sensor. The duty cycle should be between 45-55 percent for a good sensor. An internally shorted CAM sensor can pull the 12-volt reference circuit low causing DTC P0335 to set.

[Polak]

We do have the terminals available to us for terminal replacement, but I'm going to guess that most service departments keep these things out in the shop and not in the parts department, just like we do.  We have like 20 differet trays, each with a dozen or so compartments, all with different terminals in them.  It's a real nightmare finding a terminal you need and they can't just look it up in parts.

 

So, it really depends on your dealer, as to whether or not you can purchase them over the parts counter.  You'll probably need a sample of the actual terminal you need for comparison purposes.

 

 

Here's some diagnostic aids on that DTC.  Dunno if it will help...

 

----------------

 

The following conditions may cause this DTC to set:

 

  •  Camshaft reluctor wheel damage 

 

  •  The sensor coming in contact with the reluctor wheel 

 

  •  Foreign material passing between the sensor and the reluctor wheel 

 

Using Freeze Frame/Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass or a fail. Operate the vehicle within the same Freeze Frame conditions such as RPM, load, vehicle speed, temperature, etc. that you observed. This will isolate when the DTC failed.

 

The CMP sensor output can be tested. The sensor must be supplied with a power and a ground. The engine must be cranking to perform this test. You can measure the duty cycle at the signal circuit of the sensor. The duty cycle should be between 45-55 percent for a good sensor. An internally shorted CAM sensor can pull the 12-volt reference circuit low causing DTC P0335 to set.

 

<{POST_SNAPBACK}>

 

 

 

Thank you!

 

I ran the duty cycle on the CMP and it checked O.K.

 

Can you give me an idea of what I may be looking for as far as reluctor wheel damage? I've looked at it and cannot really say I would know what instance would constitute "damage." All I can see is one (maybe two) raised points on the wheel.

 

How could contact between the wheel and sensor be resolved?

 

Thanks (again),

AJ

[GM-Tech]

Can you give me an idea of what I may be looking for as far as reluctor wheel damage?

 

Chipped, missing pieces?

 

How could contact between the wheel and sensor be resolved?

 

To resolve it you'd first need to know the cause.

 

Understand that those suggestions are waaaaayyyyyy out in left field, but they can't leave them out as a possibility. They have no clue what work has been done, who has messed around with it, etc., If no one has been in there hammering away on the reluctor, or something else wasn't flying around loose in there, I don't see how any damage could occur.