Technical Non starter

[johnpu]

please can some one help, I have a 2003 ducato 2.8
I do no have 5 to battery voltage to the crankshaft sensor only 2.5v
Checked the fuses in the engine bay

 

[johnpu]

Jackwhoo, if that's right why is the recounter not turning on easy start ?????

 

[jackwhoo]

Jackwhoo, if that's right why is the recounter not turning on easy start ?????

The elearn from fiat posted by @Communicator is correct.
The rev counter can be an indication of crank sensor failure depending on how the rev counter functions but is not infallible. I do not know why rev counter not functioning.

You could measure ac volts between the crank sensor signal wires at the ecu connector engine cranking to check your new sensor.

You could see if your old crank sensor is magnetic if you still have it.

 

[jackwhoo]

With ecu plug disconnect . Check the resistance between the connectors in plug for the crank sensor, the resistance should be the same as a new crank sensor. If open circuit the there is a break in the crank sensor circuit.

 

[johnpu]

Thank you jackwhoo, i will have a look at the old one
But i think my problem is only 2.5 volts coming from the ecu to the crank sensor

 

[jackwhoo]

Thank you jackwhoo, i will have a look at the old one
But i think my problem is only 2.5 volts coming from the ecu to the crank sensor

The crank sensor provides a voltage signal to the ecu . The sensor is "dumb" and does not require any power or voltage from the ecu. So you would not expect a particular voltage at the ecu side of crank sensor wiring.

The only way you would know if the voltage you are reading for the crank wires at the ecu is normal or not is test an identical working ecu.

Test the resistance of the crank sensor at disconnected ecu plug .

 

[johnpu]

I'm back, like a bad penny, sorry been away,
I sent the ecu to ECU testing, just had a email to say they do not have the equipment to test it.
Please can some one recommend a repair place the can test and repair the ECU

 

[Mike1alike]

When I needed to repair the ECU I saw this place that looked legit to me:

Contact Page | Get In Touch - ACTRONICS LTD

Do you have a question for us? Please contact our customer service via e-mail or phone.

www.actronics.co.uk

As I got another SH good ECU, I didn't get to send mine and see if they really do the repairs.

 

[Mike1alike]

Also this one, the same:

https://www.ecutesting.com/contact-us/

 

[johnpu]

Hi jackwhoo, Just read your last post, thanks, the crank sensor that i have is a three wire sensor, red power from ecu 5v black earth and white signal form crank sensor to the ecu.
But as i have said i only have 2.5v from the ecu
I might be wrong but i think you are taking about a two wire crank sensor

 

[johnpu]

Thank you Mike1alike, ECU TESTING is the one that cant test my ecu

 

[Communicator]

Hi jackwhoo, Just read your last post, thanks, the crank sensor that i have is a three wire sensor, red power from ecu 5v black earth and white signal form crank sensor to the ecu.
But as i have said i only have 2.5v from the ecu
I might be wrong but i think you are taking about a two wire crank sensor

Perhaps I have said this before? In my understanding the crank sensor is a 2 wire device, with a screened cable. That is what the lower RHS corner of the attached diagram suggests to me. How about Red & White = signal to ECU, Black = screen to earth via ECU?

 

[Eternal Optimist]

I'm back, like a bad penny, sorry been away,
I sent the ecu to ECU testing, just had a email to say they do not have the equipment to test it.
Please can some one recommend a repair place the can test and repair the ECU

I had great service from this place...

ECU Doctor.

They even supplied me with an ECU cloned to my vehicle for trial purposes - for a charge, obvs.

 

[johnpu]

Communicator, thanks for the reply, but please if possible tell me why i have 2.5v coming out of the ecu going to the crank senser and ECU tuning has a youtube video saying that it is 5v coming out of the ecu
as you can see i am confused


Eternal, thanks, i will phone them

 

[Communicator]

Communicator, thanks for the reply, but please if possible tell me why i have 2.5v coming out of the ecu going to the crank senser and ECU tuning has a youtube video saying that it is 5v coming out of the ecu
as you can see i am confused


Eternal, thanks, i will phone them

If as I suspect the ECU port is just an input connection, you would be seeing an internal biasing voltage via a high resistance. Your meter could be less sensitive than that used on Utube. This would result in a lower reading. Perhaps some research into the Bosch crankshaft sensor would resolve your conundrum.