Signal problem maf citroen c3 1.4 hdi 90cv delphi

Hi to all, this c3 1.4 hdi 90hp 2002 with ecu delphi has a problem with the maf. After the various measurements ? arrived at the problem that the ecu is not communicating with the mass air flow sensor...
In diagnosis from air mass meter, the car does not accelerate as it should but does not even make a tear smoke.
Tested it with a meter new, checked all the wiring, maf, and their voltage.
If I'm going to see the real values with the car in motion is giving me the value of air mass measured but it's not giving me the target, the test is made with a new maf.
The only thing ? the ecu does not receive the signal sent from the maf. As you can? intervene on the ecu?

excuse yourself on the ecu pins and measure with a multimeter the signal that comes from the maf then measure the signal coming from the temp sensor intake air 5v and negative, and the answer comes by itself

On the pin of the control unit, I checked and do not reach the signal from the maf...

Quote:

---

Originally Written by dvdtuning

On the pin of the control unit, I checked and do not reach the signal from the maf...

---

on the pin of the maf goes out the signal then if you remember the error code and description ? a lot of help but it says short circuit to positive ? the maf ? powered 5v and the negative ?

The error it seems to me, p0121, the maf has 5 wires, negative, positive, temperature, 2 signal...

but on the harness with the ignition on you will find both 12v and 5v?

pin1=signal temp. air,pin2=reference, pin 3=not used pin 4= +12v power ( fusibilef15 the fuse box and relay in the engine compartment) pin 5=signal ground air pin 6= ground

It gives me both the 5v ke the 12v, I have followed the scheme of testing that I get from the kts bosch...

Error p0102, meter contact to the ground!

but if you erase the dtc reoccurs?

the test has sostitire in turbo pressure sensor

before changing the ecu would check good the wiring even I would make a bridge from the ecu to the air mass meter

Quote:

---

Originally Written by legendaryslave

before changing the ecu would check good the wiring even I would make a bridge from the ecu to the air mass meter

---

I agree with legendaryslave let's back up with evidence, otherwise you don't go out more . checked the wiring is not that the masses various, controlled solenoid valves and wiring, egr, prex, turbo ,central let it as the last control

The error does not cancel it...wiring checked and ? ok, turbo pressure, I do not see why? since the real values are within the normal range and if out the meter of air the kts gives me only the temperature in the ir? as an error and nothing else.
I also tried with the bridge but nothing...? very strange that the car does not turn on it light make it smoke ? just a little more? the saps.

do this test.unplug the air mass meter from the hardware filter and sleeve turbine,without detaching the wiring insert a needle nelpin 5 meter (signal mass air ) connect a multimeter, and detects the voltage of 1v. then try to blow air at a distance and see if the m.m.to change the voltage of 4.6 v( an, however, do not blow very strong, you may ruin it if it is not already

Then the meter ? tried it on another car with the same engine, and appears to be working well. After the measurements, the signal that I do not have ? your 1v...

look what the gauges look the same but for the car dealership, there are 3 different references, a council only original.

The same engine with the same acronym fits the same maf...among other things, that the other car was also gold!

Updates, I have also tried a kit ecu+bsi+keys, and the error is always present, tried also to make a direct bridge with the ecu and don't change anything! I told the customer that the egr is flanged, could be the problem? Even if the error as soon as I turn the key without putting in motion, and this makes me think of something electrical, not mechanical...

Sorry, but have you tried to do a mass direct wiring between the flow meter and the battery negative ?
To me on the debimetri bosch ? often you logorava or broke the line of the 5v, maybe on your own ? such a thing, but on the mass..

The guys with the wiring I have done all the tests imaginable...sure that the possibilities? these are: wiring, mass air flow sensor, ecu.

but the ecu is not you know how to open ? maybe you can find the track burned and the redo to the pond

Quote:

---

Originally Written by dvdtuning

The guys with the wiring I have done all the tests imaginable...sure that the possibilities? these are: wiring, mass air flow sensor, ecu.

---

so to recap, you put on the sensor and you have a signal variable that comes from the mma and do not see it,rightly so, can not get to the ecu you have measured the voltage coming from the ecu to the debbimetro and you have the 5 volts ? the mass and there we have it, all the evidence lead to the gauge of the air that you replaced, you've replaced the plug with another and with the wiring apart from following all the signals in the ecu eye 3 wires come from the engine control unit one then you are the 31 that feeds the musuratore of the air mass and the other is under the fuse that is out of the box rel? and fuels the temperature sensor
if the presence of all the signals you are missing only one of the air mass meter something does not, or does not turn on the meter or the signal is not seen by the ecu

Quote:

---

Originally Written by danny677

but the ecu is not you know how to open ? maybe you can find the track burned and the redo to the pond

---

I tried it with another ecu, transferring, and rightly, the e2p, but the error remains.
If the out point the meter in addition to the error present me the temperature then presumably the temperature works.
I jumpered the three wires directly from the meter to the ecu, both through a via plug of the harness with the fastom directly into the meter.

guys but this ecu can you? write in the bdm? I opened it by cutting the plastic but I have not found the pitches...anyone have a picture or a hint on how to do it?

excluding the ecu and excluding the meter in the nature of things there must be something in the wiring, not escape me know..
this delphi bdm does not do it, only obd2 or tour

need to see if the meter has both the mass and the voltage to turn on the schema to the hand

l error you f? remove and then reappears?remove the flange l egr and test

The error clears and resumes as soon as the ignition is switched on. In fact prover? to remove this flange.

ok for? without the engine running c'? or not c'? the flange ? irrelevant..
also try to give a controlled electric actuator of the egr valve

battery and vehicle masses are efficient?

You battery ? ok, voltages ok.

With this machine I did go crazy a couple of people.
In my case the ecu cold does not detect the pedal, the wiring ? ok, the pedal as well.
It would seem the input stage of the ECU that cold works badly, and now the heat does not, as soon as winter arrives, begins with the defect.
Long ago the mechanic I had found of the companies that reset the fault by sending him to the ECU.

Finally we came to****...the mass air flow sensor new taken in citroen and is found to be faulty, tried it on another car with the same engine code had a different code! Changed the mass air flow sensor in citroen with another, changed ecu + bsi and the error disappeared. The car goes well, after the huge shaking, we came to the conclusion!

Quote:

---

Originally Written by dvdtuning

Finally we came to****...the mass air flow sensor new taken in citroen and is found to be faulty, tried it on another car with the same engine code had a different code! Changed the mass air flow sensor in citroen with another, changed ecu + bsi and the error disappeared. The car goes well, after the huge shaking, we came to the conclusion!

---

all well that ends well

then it was the mass air flow sensor or the ECU?

We all say and two because even with the new system gave the same error, also changing the ecu is solved!