replace ecu seat ibiza magneti marelli

[m3m5]

hi mates! i have problems with ecu in seat ibiza 1.4 bby 2004. 036906034 GM IAW4MV.GM

the ecu register P0301 and inyector 1 stop works. the fail is occasionally. 10 days runs good, one day fails. when fail, you erase errors and run good another time.

this car is the same like this http://www.digital-kaos.co.uk/forums/f152/need-help-seat-16685-p0301-163534/

we think that is ecu. If i buy used ecu works? or need reprogram with vcds?

[m3m5]

any idea mates???

[oldford]

P0301 - misfire cylinder 1 detected.
The ecu has detected that a misfire occurred in cylinder 1 - that means the mixture wouldn't burn and the petrol went into the exhaust.
Unburnt petrol in the exhaust causes damage to the catalyst, so to protect this expensive part the ecu switches off the injector to cylinder 1.

Causes can be a bad spark plug, bad ignition coil, wrong mixture or a mechanical defect in cylinder 1.

Can you read fuel trims and post them here? Either VW specific or EOBD/OBD2 generic.

[m3m5]

hi mate! i think that we spoke about this.

well, spark plug are news, coil i have put another in number 1, mecanical defect i have checked compression engine, in hot and cold. Is good.

here post mixture.
11: intake mainfold absolute pressure 29kpa abs
06:short term trim bank1 0.0%
07: long term trim bank1 -10.9%
12: engine rpm 692/min

11: intake mainfold absolute pressure 22kpa abs
06:short term trim bank1 0.0%
07: long term trim bank1 -10.2%
12: engine rpm 3000/min

always 06 short trim is 0.0% tick over and 3.00rpm.
Is tick over (english)? ralenti 700 rpm.


When ecu register fails, the car isn't good. haven't got power, but you clear codes and run perfect!!! if injector is bad or have mechanical defect when you clear fails, car would be bad ?? do you understand me? i think is electronic breakdown.

[oldford]

Ecu deliberately switches off the injector to protect expensive parts. That's why there is no power. Do you understand this?

Mixture is too rich.
Could be a leak around the map sensor, a vacuum hose split, or a leaking gasket. Check those.
What is the pressure in pid 11 with ignition on, engine OFF?
What is the signal of the front oxygen sensor at idle and 3000 rpm. Watch for several seconds to see minimum, maximum and how fast it switches from low to high.

To test injectors: switch injector cylinder 1 with injector cylinder 2. Then wait and see which cylinder will produce the fault.

[m3m5]

Pid 11 100kpa abs ignition on engine off
pid 52 bank1 sensor 1 993-1003 lambda at idle switches is quickly, i think is normal.

i have change injector 1 for other used.
Now 16685 appear in ecu, but obd light is off and car don't fails.

I don't find leaks!! i saw canister valve is always working at idle too??

[m3m5]

resume! just now!
car at idle. blink obd light car fails. read vcds 16685 car run in 3 cilynders.

measuring Oscilloscope injector 1 don't have signal
injectors 2-3-4 good signal.

vcds clear fails with engine on, signal oscilloscope injector 1 good, car 4 cilynders.

why ecu cut signal?? is broke??? a leak could do fail and stop injector 1???


this drives me crazy!!!

[oldford]

Oxygen sensor is a wide band sensor, so voltage doesn't say much as every manufacturer can choose some level.
There's a second line with pid 52. What does that line say?

[mage]

Had the exact same problem a while ago.
Also a Seat.
Little different ECU (IAW4LV) and different codes.
Mil on, DTC P0304 and P0301 and injectors 1 and 4 stopt working, one week good then fails again.
When fails erase errors then run good.
Replaced coil, sparkplugs,injectors, scoped signals and checkt wiring.
Problem still there.
After replacing ECU problem gone.
So in my case it was a ECU problem.(Bad driver I think)

[m3m5]

Oxygen sensor is a wide band sensor, so voltage doesn't say much as every manufacturer can choose some level.
There's a second line with pid 52. What does that line say?

second line pid 52 was mA, i don't remember what numbers. tomorrow can connect. I'm going to put gas tester. if Co2, O etc are good haven't got leaks.

I have got dump from this ecu. tomorrow maybe i have got another ecu but is AH not GM is from seat ibiza 1.4 16v BBY too. i don't know if it is valid.

[m3m5]

Had the exact same problem a while ago.
Also a Seat.
Little different ECU (IAW4LV) and different codes.
Mil on, DTC P0304 and P0301 and injectors 1 and 4 stopt working, one week good then fails again.
When fails erase errors then run good.
Replaced coil, sparkplugs,injectors, scoped signals and checkt wiring.
Problem still there.
After replacing ECU problem gone.
So in my case it was a ECU problem.(Bad driver I think)

hahaha the same, the same problem!!! only in my case cut injector 1. I have got diagrams and pin 96 from ecu is injector 1 but i don't know why cut. 10 days good, and fail, 3 days good and fail, but know fails often.

[oldford]

Ecu cuts signal to injector 1 to protect the expensive (800 euro) catalytic convertor, because there's a misfire.

You are right about the Lambda signal - Lambda 0.993 to 1.003 is normal.
Does not explain why the Long Term Fuel trim is -10%. For that the signal from the Oxygen sensor had to be rich for some time.
Are you 100% sure the cambelt is correct and the timing is correct?
How much compression did you measure?
Have you measured fuel pressure?

[m3m5]

cambelt i changed this summer. I remember owner told me, that the car fails sometimes, before changed it. I have seen it two times for be sure. car run perfect when is good. If cambelt not be good, car would be failing all time.
Compression is good, cyl1 13 bars others 14,5
Fuel press i don't measured, i can do now.

I probed with other new lambda 5 cables, 2 weeks ago, 180€ and the same fails.

Oldford, one thousand thanks for help, never found car with this fails.

I want tell you, is possible copy dump eprom ecu GM to AH? it's for try it with another ecu.

[m3m5]

I have got used ecu. Can I pair immo-ecu with vcds? immo is on now with used ecu. number chasis and immo are differents! but I can't open because screws are indicated!

[m3m5]

well mates, 2 month after, the same car, the same problems.

I have replaced ecu by another programed with the same data, chassis, immo number etc. 2 ecus the same problems

the fails happens when car is cold, you drive 2 minutes, stop car and leave the car at idle.

If driving without stopping, car gets hot to 95? then not fail.

Any idea? spark plugs news, coil changed position, injector changed position, cambelt correct, compression good

thanks!

[oldford]

Probably a lean mixture that causes this, not the ecu.
Check for air leaks and/or faulty injector(s) and/or faulty sensors like the coolant temperature.

What scanner do you use to read the codes?

[autoelectric]

Maybe there is a mechanical fault. Even if the compresion is nearly the same some time a little deference between cylinders can cause this kind of problems.
Maybe there is a sticky valve in the cylinder that misfires. This can explain why the problem is bigger when engine is cold.

[m3m5]

I read with vcds 10.6.

Sensor coolant temperature was changed 2 times. I had got one used in garage for try in cars, but I bought a new one for discard malfunction. 3 sensor coolant do the same.

which would be the correct data in short and long fuel trim? In cold oscillating quickly short trim -5 to 10 more/less. In hot stops at 0 at idle.

Tomorrow could posts results hot cold. Today i have reviewed timing belt. i have adjusted belt tensioner in short timing belt. Have got 2 because is 16v.

thanks mates!

[sazimam11]

Hi mate, have you discovered what was the problem yet? I am suffering the same thing these days. Just about to change the ECU as I suspect the injector driver decoder is bad. A desoldered PCB is shown below...

[maki]

Hi,
I have same problem with polo 1.4 036906034DD IAW4MV.DD,in me 2 injector stop works,please explain how you solved your problem...maybe any other have same problem..please help!

[multiplex1976]

I have same problem with seat ibiza 1.4 16V engine BBy code fault P0303

[jnoroeste]

Hi M8?s

These are common faults in petrol engines, many times are caused by bad maf, asumming all other componentes are ok, disconnect maf and check if runs better,
Inside ecu check injectors driver and repalce if faulty.
Last option is ecu replace by second hand unit, need pin code to macht.

Regards.