What's that? Right from the ECM

[gemini25]

Hallo,
sorry to ask you. But knows anybody, what this is? It is right from the ECM and it isn't connected to anything. I mean this thing with the serial number MFR-.....???
Thank you

 

[NDT]

I think that is the interference filter and it is bypassed because it causes problems.

 

[Suprman]

Yup

 

[gemini25]

Thank you. Interference filter for what? To protect the ECM? My ECM is dead, because of an internal shortcut from the batteries.
I know interference filter with AC current, but not with DC current.
Does anybody has the serial number? Then I would try to find a technical data sheet.

 

[Suprman]

Your ecm is dead because the internal memory battery died from old age. Has nothing do to with the bypassed filter.

 

[gemini25]

Sorry, that is not correct. My ECM is in a repair shop an the internal power supply is damaged, not the battery. And this happened as one of my 12V batteries had an internal shortcut.

 

[spankybear]

Sorry, that is not correct. My ECM is in a repair shop an the internal power supply is damaged, not the battery. And this happened as one of my 12V batteries had an internal shortcut.

I would think an internal short in the battery would just cause the battery to drain and go to zero volts. How did it mess up the ECU?

 

[coachgeo]

I would think an internal short in the battery would just cause the battery to drain and go to zero volts. How did it mess up the ECU?

jumping truck with a short in battery is maybe what the guy was referring too the burn up of the power supply??? or the fellow is blowing smoke up gemini25 arse..... like a mechanic selling a blond a new transmission saying " if she had not let it get low on anti seize fluid she would not have broke it"

 

[spankybear]

jumping truck with a short in battery is maybe what the guy was referring too the burn up of the power supply??? or the fellow is blowing smoke up gemini25 arse..... like a mechanic selling a blond a new transmission saying " if she hand not let it get low on anti seize fluid she would not have broke it"

While jump starting does have the potential to send a voltage spike down the system, I don't think internally shorted batteries would cause this type of damage. Then again strange things can happen.

If the ECU can't handle a voltage spike the engineer who designed it was a HACK. There are many thasounds of ECUs out there that get Jump started all of the time. You just don't see them dead after a jump..

 

[Ronmar]

They can repair an internal power supply but they cannot change the battery on an ECM?
yes, the designers were hacks... they used a volatile memory that would kill the ECU when the memory battery died(Lot of money in proprietary parts)... Supposedly cat changed this design...

 

[spankybear]

I think this is the battery for the ECU... But not sure. I don't have an ECU in my leaky truck but if I did I would find a way to replace the battery. There should be a way to replace without losing memory.

 

[gemini25]

So, I send my ECM to a repair shop and they can repair it. They said the internal power supply is damaged.
Looks like I got a voltage spike from somewhere.

And now I come back to my first question. Can it be, that this piece right from the ECM it there to protect the ECM?

 

[qrad]

I believe you are correct - the filter was meant to protect the ECM from electromagnetic interference/pulses. Was your repair successful? Were they able to replace the battery while they repaired it? Who repaired it? I believe I may have an M1078A1 with an ECM with a similar damaged power supply.

When I turn on the ignition switch the check engine light blinks for a split second as the voltage meter blips down from 24V. As the check engine light goes off, the voltage meter blips back up to 24v. I plan to disconnect the P2 (front) connector on the ECM to see if there is possibly a short on the engine side in a sensor maybe? I'm hoping to be able to keep the ECM powered on for long enough to establish a connection with a code reader. So far I haven't been able to get a connection.

If I can't get any connection after removing the P2 connector, I am considering using an aftermarket ECM repair service in Fort Worth, TX.

 

[coachgeo]

I think this is the battery for the ECU... But not sure. I don't have an ECU in my leaky truck but if I did I would find a way to replace the battery. There should be a way to replace without losing memory.

this never got answered...... to spark (pardon the pun) could one sodder; in parallel, a second battery holder with a switch and maybe something to buffer any spikes then plop a good batt. in it?? . Followed by removing old batt..... and replace with new batt. then flick the switch off... ?

granted that sounds so simple on face of it. likely not that simple......

 

[frank8003]

jumping truck with a short in battery is maybe what the guy was referring too the burn up of the power supply??? or the fellow is blowing smoke up gemini25 arse..... like a mechanic selling a blond a new transmission saying " if she had not let it get low on anti seize fluid she would not have broke it"

This belongs in the joke of the day .............................