Technical Hello, and help Please! Panda 1.1 8v permanent P1325

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Technical Hello, and help Please! Panda 1.1 8v permanent P1325

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Hello and Welcome. Sorry for my bad english. My name is Piotr and i'm electro-mechanic, but i'm specialist of elevators, and escalators.
I buy Nuova Panda 2005 last weekand i love it, but after buy i connect to MES and find fault number P1325.
On ingnition The fault is permanent and cant be clear.
After engine start i can delete fault, but after engine stop fault still is active.
I check knock sensor and have 0.561M resistance, so looks good, but order new one (probably deliver 30.09.2021).
I check wiring to IAW 4AF.SM and seems good. I check 4AF.SM pinout and see only 1,3V on pins to Knock sensor (maybe i check wrong one but dont have service manual with pinouts)
I'm think if Fault Code is permanent active without engine start and cant be deleted maybe my IAW is faulty and got "cold soldering"?
Can you give me pinout to check my work?
Other issue is engine shake about 10 seconds after engine cold start. Maybe this two things have something in common?
Please help, and thanks for advice.
 
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If you did this with MES, it will have explained what the code relates to. Please give this explanation, so we do not have to go search for it somewhere. Then we can help, hopefully.

Engine shaking would suggest a misfire, common on these engines if the spark plugs are old, or the spark plug cables are old. If ignored, they can lead to failing coils.

The 1.1 has been reported as occasionally having loose pins at the ignition computer. Remove the plug, carefully, and check all pins are tight, and all the same height.
 
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If you did this with MES, it will have explained what the code relates to. Please give this explanation, so we do not have to go search for it somewhere. Then we can help, hopefully.

Engine shaking would suggest a misfire, common on these engines if the spark plugs are old, or the spark plug cables are old. If ignored, they can lead to failing coils.

The 1.1 has been reported as occasionally having loose pins at the ignition computer. Remove the plug, carefully, and check all pins are tight, and all the same height.

isnt P1325 an error that comes on during the power on self test

rather than a running issue

I doubt spark plugs will help

maybe look at the voltage to the sensor

check for open and short circuits
 
P1325 an error that comes on during the power on self test

YES!!


Today i disassembly all electrical wires inside engine compartment and clear all plugs and body+gearbox grounds. Clear sensors and do self adaptation with phonic wheel.
Nothing change. Still have permanent fault on P1325 without engine start

Even disassebmly engine computer but without any visible issues.
Continous in Knock sensor wire is okay. Without ground.
What woltage must be on pins from 4AF? In my driver is 1.35 and 1.60V

i cant add html link because dont have nessesary post. i add with space can see fault https :// ibb.co/9ZhbyGD
 
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The sensor makes it own voltage

They are normally biased to avoid noise

Usually at 5V but it can be anything picked by the Fiat

I have looked at the wiring diagram and the voltage isn’t marked. Both cables go straight to the ECU with no other joins so should be easy to follow and beep through.

The only way to know what the voltage should be is to measure a working car.

Pouring with rain here at the moment
 
Driver have continous to that points. One is pin1 second is pin2 from Knock
 

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Okay, i done test drive and in constant speed about 90-100km/h engine "jump" and i scare about to stop :/.
New code detected P0325 (Bank 1 knock sensor) so probably IAW 4AF is broken. :(
 
because the continuity doesn't mean the wiring is okay.

Can you please post a close up of the connector and pins on the ECU

check both wires for a short to ground. Highly likely. Disconnect the sensor and measure the volts at the connector.

The output from the ECU are will protected. If you insert the wrong bulb for example it senses the overload and it cuts the power
 
Is there any way to disassembly that plug?
 

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Can you please post a close up of the connector and pins on the ECU

check both wires for a short to ground. Highly likely. Disconnect the sensor and measure the volts at the connector.

No short to ground. I check pins with 50W bulb and also works fine.
I measure voltage on Knock pins in the end of line. First two photos only on ingnition (test), second two on working engine.
Ofc signal is + because i got crocodile clamp on com.
With Knock connected, and disconnected still P1325
 

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you've done everything I would do so running out of ideas.

I do sometimes have problems clearing codes when using a computer

sometimes I have to clear the codes then pull the OBD out. Switch the ignition off and back on again for the reset to take. I have had three Pandas only one does this. No idea why

really need another photo of the ECU connector, Can only see 3/4 of the pins. Looks damp, sprayed some switch/contact cleaner ?
 
Yes, they was sprayes with Contact spray. Here is more photos. All seems be okay.
Do you know voltages 2,5V are normal?
 

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Is there any way to disassembly that plug?

Yes.
All the parts will come apart. The plastic parts are just clicked together, so will come apart if the small barbs are prised away, but this needs tiny probes, and knowing where to pry and in which direction. The wiring connectors will all come out, they are held in with sprung barbs, again need to know where. Be careful to note where each wire goes of course.

Have a browse of this website, https://www.te.com/usa-en/products/connectors/automotive-connectors.html

Might take some time to identify your connector, but there are some detailed drawings, of both connector and housing, which will help.
 
I watch Eric O on the you tube SOUTH MAIN AUTO channel
He does a lot of diagnostics and it give you lots of ideas where to look for faults, from fuses and tracing circuits to failing connections and wires literally falling apart, Eric calls these 'green Crusties' to cable holders that have cut into wiring and a few 'cheats' on American vehicles that destroy components due to the amount of salt on their local roads, Some American cars are so rotted with rust you cannot believe they are still on the roads!!
 
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