Eurovan2 Forums - View Single Post - 2.2 hdi Blocked diesel filter message ECU faulty???

Luc_C5 · 6th July 2009, 21:45

I checked my spare differential pressure sensor in my laboratory:

I supplied +5v to pin 3 and -5V ( GND ) to pin 2.
on pin 1 the voltage it is ~0.5V

if I blow in one of the pipe connection voltage increase till ~ +1V
if I blow in another pipe then voltage decrease until 0 and from there to ~ -V.

so the documentation it is correct.

Regarding your checking on pin 1 from ECU without sensor connected it is correct;
I think on the pin 1 from ECU it is a voltage divisor this is why without sensor connected you have +4.9v, and this value according to documentation correspond to a clogged filter and it is correct.

6th July 2009, 21:45	#5 (permalink)
Luc_C5 Conqueror Join Date: 20 Dec 2007 Location: Right now I'm inside PSA XS interface ! Posts: 60 Thanks: 1 Thanked 15 Times in 12 Posts Car: Citroen C5 Country of origin:	I checked my spare differential pressure sensor in my laboratory: I supplied +5v to pin 3 and -5V ( GND ) to pin 2. on pin 1 the voltage it is ~0.5V if I blow in one of the pipe connection voltage increase till ~ +1V if I blow in another pipe then voltage decrease until 0 and from there to ~ -V. so the documentation it is correct. Regarding your checking on pin 1 from ECU without sensor connected it is correct; I think on the pin 1 from ECU it is a voltage divisor this is why without sensor connected you have +4.9v, and this value according to documentation correspond to a clogged filter and it is correct. Last edited by Luc_C5; 6th July 2009 at 21:48.
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