Code Triggers on Fords

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  #1  
Old 12-03-06, 10:07 AM
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Code Triggers on Fords

Can spark plug wires trigger a 340 code on '98 Ford Windstar 3.8L V6 ?

After doing some research I found out the 340 code dosen't nessecarily mean a bad cam shaft sensor. It can also be caused by electrical interference like from an altenator shielding breaking down. So, would it be plausible to say that wearing spark plug wires could also cause this even thou they appear to be OK.


Can any one give support to this or is it bogus ?
 
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Old 12-03-06, 10:09 AM
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Is this a P0340 code? I don't see the plug wires doing this. If the plug wires were bad bad, then you would probably have misfire codes as well. I would check the wiring going from your cam sensor to the module. Make sure no wires are corrodes or broken.
 
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Old 12-03-06, 10:16 AM
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Also something to think about, a bad/stretched timing chain with throw a P0340 code, along with alternator/belt
 
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Old 12-03-06, 11:09 AM
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was your original cam sensor look ok or was it broken in the inside?
 
  #5  
Old 12-03-06, 06:19 PM
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From Ford:

{Quote}

PO340 CMP Sensor (Camshaft Position Sensor) Circuit Malfunction

Description:
The test fails when the PCM can no longer detect the signal from the CMP sensor

Possible Causes:
CMP circuit open
CMP circuit short to GND
CMP circuit short to PWR
SIG RTN open (VR sensor)
CMP GND open (Hall Effect Sensor)
Damaged CMP sensor shielding
Damaged CMP sensor
Damaged PCM

Diagnostic Aides:
Harness routing, harness alterations, improper shielding, or electrical interference from other improperly functioning systems may have an intermittent impact on the CMP signal

{End Quote}

Basically "electrical interference from other improperly functioning systems" could be a lot of things
The EEC-IV can be pretty picky as to it's ignition components
That's why I asked about the plug wires in the other thread
I've not heard of plug wires throwing this specific code
I have however, had aftermarket wires (even beefy "racing" wires) cause other problems on EEC-IV controlled vehicles
It was just a thought


In the other thread you said you force cleared the code several times
How did you do this?
 
  #6  
Old 12-04-06, 05:31 AM
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Yes, the code is a P0340.
The original cam sensor was not damaged.

I cleared the code by diconnecting the battery_the light did go out.
I also had AutoZone use an analizer to clear the code but both ways the code came back.

I also used my DMM and test light to check the harness at the connector of the CMP.
The ground is OK / I got 24V on the VPWR but I not sure how to check for the signal line.
 

Last edited by Mackey; 12-04-06 at 03:01 PM.
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