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

[koalar]

We need to revisit this one

Multimeter on the engine block and the ECU while cranking was 0.8 volts, is this still the case, we have cleaned up the earth's since then

It's the wrong result, and we have never retested it after doing all the earth points

 

[RDM1]

We need to revisit this one

Multimeter on the engine block and the ECU while cranking was 0.8 volts, is this still the case, we have cleaned up the earth's since then

It's the wrong result, and we have never retested it after doing all the earth points

heatshield or the grounds on the ECU connected together?

 

[koalar]

Normal? Or the timing belt jumped a tooth?

It also proves the camshaft is being read and the position notch's are being recognised

 

[koalar]

heatshield or the grounds on the ECU connected together?

The aluminium fins

 

[RDM1]

Ok so on the rear heat shield i got
Ignition off 0v
Ignition on 0v
Cranking 0.29v->0.20v

 

[RDM1]

And something very weird happened in this video when i did it, opening the ignition gave me 0.26v dropped to 0.16v before the 2 seconds were over and the voltage immediately went down to 0v after the 2 seconds of staging were over tried to reproduce it by recording it in this video and once again before and surprisingly it didn't do it again

 

[RDM1]

For me the video did not seem to have uploaded so this is it again

 

[koalar]

That's fine 0.2V is good

I just wanted to double check as when we first checked it it was 0.8V

And we never check again after cleaning the earth's, everything is good

I have obviously missed something obvious

We have never checked the 5V reference voltage, it's one of the first tests I normally carry out but because we have been chasing error it got skipped

It's on a lot of the sensors, and used for communication, the camshaft sensor on top of the engine has three wires on one side is the 5V ref the other signal ground with signal in the middle

Test each side with the other multimeter probe on battery negative post, at ignition on and cranking

No need for photos, just post the four values, please

 

[RDM1]

And something very weird happened in this video when i did it, opening the ignition gave me 0.26v dropped to 0.16v before the 2 seconds were over and the voltage immediately went down to 0v after the 2 seconds of staging were over tried to reproduce it by recording it in this video and once again before and surprisingly it didn't do it again

It's raining now gonna go check it as soon as it stops but is this normal????

 

[koalar]

0.26v is that while cranking or ignition on

 

[RDM1]

At ignition on It gave me 0.26v and started going down to 0.16v before it abruptly reached 0v after the 2 seconds were over

 

[RDM1]

I tried reproducing it with the video but it didn't do it with 5 attempts so i showed you where and what i did

 

[RDM1]

So to sum it up while clamped on the 10mm bolt of the ECU and on the battery negative terminal i got 1 time:

0v ignition off
0.26v slowly going down to 0.16v during the 2 seconds of staging after the ignition was put into the on position
Did not check while cranking because it seemed unnatural

Then 5 times 0v at ignition off
0v at ignition on
And 0.29v->0.20v while cranking

 

[koalar]

Right, sounds like we have an issue

Leave everything as it is for half an hour

Don't turn the ignition on, or open the door

Let everything settle, then immediately retest

I am guessing that the first turn on it going to be fairly high and every time after it going to be less

 

[RDM1]

Well the abnormal thing that got me more confused is that there was 2 times that returned 0v with ignition on before testing the unnatural one with 0.26v->0.16v

 

[RDM1]

And it's been about 4 hours since i last touched the car

 

[koalar]

I think there is high restance somewhere and it's letting the current flow slowly, eventually averaging out

We need to confirm that's what's happening


If it's high on the first ignition on and reduced ever significant latter turn of the key

 

[RDM1]

Any idea where to check this possible resistance?

 

[koalar]

Let confirm that's what's happening first

 

[RDM1]

Because I'm not sure i got your point but at first i got the 0v twice then i got the 0.26v then i tried about 5 times to reproduce the 0.26v to send you a video of what was happening but got 0v on the ignition on