Hi,


So i've been busy with this problem with a 1.2 1242cc 16v 188A5000 engine.. When you turn on ignition, you hear the fuelpump and some relays, now the fuelpump did not always stay on it was stuttering randomly. (on/off on/off, for random periods). After a while the fuel pump didn't get a signal at all, no matter how hard you budge the cables near the ECU or relays. Usually the relay for the fuelpump which is next to the relay of the ECU would click when you turn on the ignition... Only the relay for the ECU clicks.



Now I put direct 12V on the fuel pump but the car wouldn't start because the other actuators; sparkplugs, injectors, lambda don't get signal/power.



Now under the hood I hear clicking near near the ECU, and I think that's the ECU randomly giving signals to the before mentioned actuators. Because when the ecu clicked you hear the fuelpump for a split second. Budging the cables has no effect. This occurs randomly a few times.



I have tested all the relays including the red one. All of them click.



We have removed the whole dashboard to check all cables, fuses, relays... Budged all the cables while on ignition. Nothing happened, just randomly the clicking near the ECU and randomly activating the fuelpump for a split second.



You can't OBD either, the EOBD tester doesn't work and Examiner neither. Once I had the system working for a minute and I could enter the ECU with the examiner however there were no codes...



Additional info: KM 205.000 Built 2001.

The gages in the middle display the KM, as usual.

When you turn on ignition the yellow relay clicks behind the dash, and the red relay clicks under the hood.


I'm really confused now, how ofter do ECU's break?

have you checked the pins in the ecu for corrosion?
it sounds like you have a can line issue so this would be an obvious check
do these 12valve ecus have an earthing point on themlike the 8 valvers?
check this too
of course at this age it could just be its breaking down of course

I have a 2004 16V 1.2.



There are no relays in the ECU? Clicking near the ECU must be coming from the throttle body? I believe the throttle body normally whines *and* clicks randomly? A very loud click.



Possibly you have the same ECU as me. Mine is something like ME7HF001


16V cars do have a required good earth on the ECU which is the black wire connected to one of the bolts.



ECU's do fail but I am thinking you have a wiring problem somewhere.

Odd ball suggestion but has the coil pack been checked ie the royal3 of Air fuel and ignition ie no spark no go

scimitargtc said:

Odd ball suggestion but has the coil pack been checked ie the royal3 of Air fuel and ignition ie no spark no go

Click to expand...

One thing at a time is my suggestion. When he knows the fuel pump is not running he knows already the car is going nowhere.

(https://imgur.com/a/nbbYx5S)
This is the ECU.


The clicking comes from the throttlebody yes, The ignition does not spark, injectors do not inject. I've measured the crankshaft position sensor (RPM sensor) and the resistance is about 800 Ohm. I stripped the cable-branch from both connectors that are on the ECU, to check for corosion and other stuff. all seems to be fine.



(https://imgur.com/rSkdqdW)

Have checked these relays and fuses. Relays tested with 12 volt on pins and measuring the resistance...


No corosion.

scimitargtc said:

Odd ball suggestion but has the coil pack been checked ie the royal3 of Air fuel and ignition ie no spark no go

Click to expand...

No sparks

judderbar said:

I have a 2004 16V 1.2.



There are no relays in the ECU? Clicking near the ECU must be coming from the throttle body? I believe the throttle body normally whines *and* clicks randomly? A very loud click.

Possibly you have the same ECU as me. Mine is something like ME7HF001

16V cars do have a required good earth on the ECU which is the black wire connected to one of the bolts.

Click to expand...

Clicking is under the ECU, throttlebody yes. And there are no fuses, check my post below probably the same ECU other number though. When the throttlebody ramdonly starts to initialize (make noises) the fuelpump also works, the OBD also works. But these days its not working at all.

s and b said:

have you checked the pins in the ecu for corrosion?
it sounds like you have a can line issue so this would be an obvious check
do these 12valve ecus have an earthing point on themlike the 8 valvers?
check this too
of course at this age it could just be its breaking down of course

Click to expand...

Have put an extra earth from ECU to body.... No corrosion.

MultiRacer said:

(https://imgur.com/a/nbbYx5S)
This is the ECU.


The clicking comes from the throttlebody yes, The ignition does not spark, injectors do not inject. I've measured the crankshaft position sensor (RPM sensor) and the resistance is about 800 Ohm. I stripped the cable-branch from both connectors that are on the ECU, to check for corosion and other stuff. all seems to be fine.

(https://imgur.com/rSkdqdW)

Have checked these relays and fuses. Relays tested with 12 volt on pins and measuring the resistance...


No corosion.

Click to expand...

You say you are working on a 1.2 1242cc 16v 188A5000 engine but your picture of the relays is not from a punto. What exactly is the configuration of the car?


But do not make it too complicated. With your kind of ECU the petrol pump should run for 5 seconds and then stop when you turn on the ignition and do not start the car. Thats the first problem you need to solve to get the car running. So worrying about coils and crank sensor is just a distraction at the moment.



Are you sure you have a compatible arrangement between engine ECU and body computer and the attached fusebox in the cabin and the fuse box in the engine compartment?


Do you know the history of the fault?

I'm pretty sure the connection from the relaybox to the ECU is fine, I removed the tape and plastic harness from the wiring and went through it. Even when you have the car on ignition and you put a 12v manually on the fuelpump the car does not start, because the injectors aren't injecting, and the coils arent creating current to spark.



Like i mentioned before, super randomly and rarely the throttlebody makes a noise for a split second, and the fuel pump also makes noise at the same time. So it looks like the ECU is giving off a signal to these components randomly. When you put the car on ignition you hear the ECU relay in the relaybox click so that's working, also tested the relay with Ohm meter just to be sure.




This is a Lancia Y from 2001.

MultiRacer said:

I'm pretty sure the connection from the relaybox to the ECU is fine, I removed the tape and plastic harness from the wiring and went through it. Even when you have the car on ignition and you put a 12v manually on the fuelpump the car does not start, because the injectors aren't injecting, and the coils arent creating current to spark.



Like i mentioned before, super randomly and rarely the throttlebody makes a noise for a split second, and the fuel pump also makes noise at the same time. So it looks like the ECU is giving off a signal to these components randomly. When you put the car on ignition you hear the ECU relay in the relaybox click so that's working, also tested the relay with Ohm meter just to be sure.




This is a Lancia Y from 2001.

Click to expand...

Since you do not have a punto ECU it is impossible for me to say if the fuel pump should run for 5 seconds when you turn the key and therefore impossible to give any chance to help you with diagnostics without knowing that.



A replacement Punto plug and play virginised ECU is about 100 Euros.

judderbar said:

Since you do not have a punto ECU it is impossible for me to say if the fuel pump should run for 5 seconds when you turn the key and therefore impossible to give any chance to help you with diagnostics without knowing that.



A replacement Punto plug and play virginised ECU is about 100 Euros.

Click to expand...

(https://imgur.com/a/tBbHGNn) Here's a picture.

I've replaced the ECU with a revised one today, no result.
Not a single noise from the throttlebody or fuelpump. Not even from it's relays.

MultiRacer said:

(https://imgur.com/a/tBbHGNn) Here's a picture.

I've replaced the ECU with a revised one today, no result.
Not a single noise from the throttlebody or fuelpump. Not even from it's relays.

Click to expand...

What about the other electrics on the car? Which ones are working? Which ones are not working?



What about your instrument panel? Are you seeing oil warning, abs, battery and so forth.



A picture of the instrument panel at ignition on will be useful I think.


You could also write to the the fiat forum owner, who is friendly, and ask him for lancia, alpha romeo and fiat commerciali sections.


ben (calling forum owner, Ben)

PROBLEM SOLVED

The ECU didn't receive power from a + cable. That cable goed underneath the windshieldwipers and is really hard to access. The solution was to make a wire from the relay of the ECU direct to (i believe it was) pin 18 on connector B. The car works again.
Thanks for thinking and support

MultiRacer said:

PROBLEM SOLVED

The ECU didn't receive power from a + cable. That cable goed underneath the windshieldwipers and is really hard to access. The solution was to make a wire from the relay of the ECU direct to (i believe it was) pin 18 on connector B. The car works again.
Thanks for thinking and support

Click to expand...

Good to hear that. Does the petrol pump now run for 5 seconds when you turn on the ignition?

Don't know how long exactly but the fuelpump does run when you turn on ignition.