Technical '06 Panda crank sensor issue.....

[RDM1]

That's the behavior right now with if you can see the weird spontaneous excess radiator heat message and that's what used to happen while driving aswell

 

[RDM1]

Sorry about the pressure test but it's gonna have to stay till monday as my friend is off for the weekend

 

[koalar]

Here a working car at 1/5th speed

Here's yours at 1/5th speed

Not sure what's going on but they don't sound similar

Yours appears to have a regular clanging noise of something banging as well

 

[RDM1]

This seems like an older model can you try it with yours as yours as you said is similar to mine?

 

[RDM1]

I think it might be aswell because as you said my cranking RPM is twice as fast as you normally said it should be

 

[koalar]

 

[RDM1]

Lol i don't know why but you're right although the funny part is that my battery's CCA is low and considered bad upon testing by the machine and yet here's how it does and if i add jump start battery to it the cranking sound goes even faster now i have a theory that no fuel and spark is causing this sound but I'll leave it to you to judge but until tomorrow morning if you have a suggestion on something to test do tell

 

[RDM1]

Oh and one more thing compression might be high probably because the engine had a couple head gaskets replaced from the previous owner and they never filled the engine with coolant water only so now the rust is way too much in the whole system to a crazy extent so having machined the engine several time reducing the explosion chamber is most definitely why the pressure is high i bet

 

[RDM1]

The car was with a girl that didn't know anything about cars so unless the car completely died it wouldn't go for maintenance

 

[koalar]

My rpm it will depend on battery

 

[RDM1]

I know same here and my battery is relatively midlife you can say but still cranks the car at what I'm guessing is 500 instead of the 600 RPM but with the extra battery it hits the 600 alright

 

[jackwhoo]

Hi ,

I have been following this with interest.

Have you checked the continuity of the wires from the crank sensor to the ecu connector when ecu disconnected and crank sensor disconnected?
Also check to se if either crank sensor wire is shorted to ground when crank sensor and ecu disconnected.
Reconnect the crank sensor but not the ecu then check the resistance of the crank sensor circuit at ecu plug - it should be the same as a healthy crank sensor.

Well done you and koalar sticking with it.

Best wishes
Jack

 

[RDM1]

The thing is I'm sticking to it because this car is one of the very few cars that i found so efficient otherwise i would told my dad to take it have it sold as parts and i grew fond of it TBH.
Anyway i checked continuity between both wires on the ECU end perfectly normal, there's no short circuit aswell between both wires after removing the sensor now as i mentioned previously the insulation were burnt for a couple inches before the sensor and the wires were starting to have built up corrosion on the copper so i went and changed them. As for shorting to the ground i didn't check because the voltage readings I'm getting is illogical but if you check our previous chat in the early stages of the diagnosis you can see everything we checked but as far as we have tested it seems like everything post-ECU is fine and by post i mean ECU to CPS and all suggested groudings that koalar said to test through voltage drop test the only thing so far it the ECU heat shield that raised an alarm at 0.2v but then dropped to 0.1v afterwards (not sure why.
We're still testing and now waiting for tomorrow to do a compression test although I'm pretty sure that it's not the problem but we'll get it out of the way.
If you have any suggestions I'd be glad to try them before i lose my mind and decide on a new BCM.

 

[koalar]

Hi ,

I have been following this with interest.

Have you checked the continuity of the wires from the crank sensor to the ecu connector

Yes

And the pins in the ECU are connected

when ecu disconnected and crank sensor disconnected?
Also check to se if either crank sensor wire is shorted to ground when crank sensor and ecu disconnected.

Shorts have been checked

Reconnect the crank sensor but not the ecu then check the resistance of the crank sensor circuit at ecu plug - it should be the same as a healthy crank sensor.

Yes and within spec

Also same with 3 different sensors

Well done you and koalar sticking with it.

Best wishes
Jack

We need to get to the bottom of this

 

[koalar]

The only thing we didn't do was scope the output at the ECU, or put a couple of diodes across the pins and watch them flicker alternatively

I didn't think it was worth the effort as the cars had 3 CKP sensors

 

[RDM1]

I did that koalar it did flicker on both resistance and continuity where the insulation came off (aka a couple inches away from the sensor) so if you want, I can easily show you that. no probing is needed.

 

[jackwhoo]

I did that koalar it did flicker on both resistance and continuity where the insulation came off (aka a couple inches away from the sensor) so if you want, I can easily show you that. no probing is needed.

Please post photos of damaged wiring and how you repaired the damage.

 

[RDM1]

Please post photos of damaged wiring and how you repaired the damage.

It's still partially repaired only hooked the wires on ends by twisting them tightly.
Will solder them with shrink tubes if the car comes back to life repaired

 

[jackwhoo]

It's still partially repaired only hooked the wires on ends by twisting them tightly.
Will solder them with shrink tubes if the car comes back to life repaired

Please post photos as it is now

 

[RDM1]

As it is now on both ends and wires are the same thickness