Knock Sensor

Edward Owner Texas Posted   Latest   Edited  
Updated
Driveability
2014 Fiat 500L Trekking 1.4L (H EAM) 6-spd (DA1-C635) — ZFBCFADH5EZ019182
P0325 — Knock/Combustion Vibration Sensor 1 Circuit Bank 1 or Single Sensor
P0324 — Knock/Combustion Vibration Control System Error

Check engine light on, codes P0325, P0324 , Only top tier fuel is used, Replace Spark plugs OEM, Replace Knock Sensor OEM .code p0325 is still coming on i uploaded a wire diagram, I will be scoping the KS Signal 1 and KS Return 1 but not sure if there is a 5v REF on this circuit...

Knock Sensor Type

1)Piezoelectric Knock Sensor Design

(Replacement Parts

1)Spark Plugs OEM

2)Knock Sensor OEM)

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Caleb Diagnostician
Indiana
Caleb Default
 

I know you have circuit codes. I'm just test driving. Haven't had a chance to look up description an operation. My first piece of advice is check the oil level. Those engines eat oil.

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Edward Owner
Texas
Edward Default
 

Hello Caleb The oil level is on point 👌 but there was a saturation of fuel, smells like fuel in the oil. The oil service not due until another 1000 miles, oil servic interval Is every 4000 miles with Mobile one 5w-40 and the oil filter... But yes your correct they consume oil...

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Anthony Technical Support Specialist
Pennsylvania
Anthony Default
 

Hi Edward: If it smells like fuel then there is probably fuel in the oil. Take a cigarette lighter to the dipstick. Does the dipstick catch on fire? HTH, Guido

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Edward Owner
Texas
Edward Default
 

Hello Anthony Looks like a no go as to fuel in the oil but take a look... Thanks for the input

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Caleb Diagnostician
Indiana
Caleb Default
 

So after looking at the description and operation I think I can help you a little. The knock sensor signal wire should be 5 volts with the sensor unplugged. The return circuit should be and all time ground. The codes set when the signal wire is above 4.0 volts or below 1.0 volts. Need to connect a scope to both wire at the sensor and at the PCM and see what we have.

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Edward Owner
Texas
Edward Default
 

Yes sir I agree will post the the results as soon as possible

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Paul Mechanic
Illinois
Paul Default
 

Going off of general experiences with knock sensor codes-don't overlook the possibilities of the code being set due to the inability of the pcm to control the knock via ignition timing, due to mechanical knock that you may not be able to hear and therefore the pcm is calling out the sensor at fault.

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Edward Owner
Texas
Edward Default
 

Paul Will keep in mind... Thanks For the input

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Caleb Diagnostician
Indiana
Caleb Default
 

Did you get some scope captures yet??

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Edward Owner
Texas
Edward Default
 

Hello Caleb Working on it will have them posted by morning time

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Edward Owner
Texas
Edward Default
   

Caleb Signal @ 2.5 volts strong and 1.8 volts @ key on engine off

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Edward Owner
Texas
Edward Update
 

Looking for Good know Knock Sensor waveform...

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Caleb Diagnostician
Indiana
Caleb Default
 

Hey thanks. Sorry for just now getting back to you. Can I see the waveform with the sensor disconnected please??

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Edward Owner
Texas
Edward Default
 

Caleb Will do sir

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Caleb Diagnostician
Indiana
Caleb Default
 

What did you find??

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Edward Owner
Texas
Edward Default
   

Hello Caleb I uploaded the scope image of the signal disconnected from the knock sensor and check both signal and return, IAM getting 2.5 volts on both of the signal and return lines with the engine running , did a load test both wires tested good

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