ECU information required

[widdowson2008]

I may have missed it Steve, does the ECU still receive power when the ignition is off?

Not got to that part yet but I think it must. According to the manual, pin 2B on the ECU is shown as being connected to the batery and the signal name is 'Back up power'. This implies (to me anyway) that the ECU is permantly powered. Thinking about it, it must be powered or the fans wouldn't kick in when you remove the ignition key ................(would they?).
Yet ANOTHER thing to check

[The Great Pretender]

I may have missed it Steve, does the ECU still receive power when the ignition is off?

Not got to that part yet but I think it must. According to the manual, pin 3B on the ECU is shown as being connected to the batery and the signal name is 'Back up power'. This implies (to me anyway) that the ECU is permantly powered. Thinking about it, it must be powered or the fans wouldn't kick in when you remove the ignition key ................(would they?).
Yet ANOTHER thing to check

The more you dig, the deeper the hole..................

[widdowson2008]

I may have missed it Steve, does the ECU still receive power when the ignition is off?

Not got to that part yet but I think it must. According to the manual, pin 3B on the ECU is shown as being connected to the batery and the signal name is 'Back up power'. This implies (to me anyway) that the ECU is permantly powered. Thinking about it, it must be powered or the fans wouldn't kick in when you remove the ignition key ................(would they?).
Yet ANOTHER thing to check

The more you dig, the deeper the hole..................

Tell me about it ......................but its a nice symetrical, well formed, comfortable hole.............If I don't surface before June, bring a shovel

[g8dhe]

I may have missed it Steve, does the ECU still receive power when the ignition is off?

Yes it does Pin 2B;

[widdowson2008]

I may have missed it Steve, does the ECU still receive power when the ignition is off?

Not got to that part yet but I think it must. According to the manual, pin 3B on the ECU is shown as being connected to the batery and the signal name is 'Back up power'. This implies (to me anyway) that the ECU is permantly powered. Thinking about it, it must be powered or the fans wouldn't kick in when you remove the ignition key ................(would they?).
Yet ANOTHER thing to check

Stand corrected (by Geoff) It is 2B and NOT 3B as I said Weeeeeeeeell, you can't get it right ALL the time

[The Great Pretender]

I may have missed it Steve, does the ECU still receive power when the ignition is off?

Yes it does Pin 2B;

I will take your word for it, electrickery is my Achilles heel. Is the power just for the memory? Can the ECU supply power to the fans when ignition is off? I suspect if it does it does it via a negative feed to a relay. Is this correct, or am I barking up the wrong ECU.............

[widdowson2008]

Geoff
To complete the ECU schematic, I am looking for the circuits connected to ECU pins:
2D, 2E, 2O, 2P
3A, 3B, 3C, 3D, 3J, 3L, 3R
Can you point me in the right direction? or even better, can you email the relevant pages so I can print them off please?

[widdowson2008]

I may have missed it Steve, does the ECU still receive power when the ignition is off?

Yes it does Pin 2B;

I will take your word for it, electrickery is my Achilles heel. Is the power just for the memory? Can the ECU supply power to the fans when ignition is off? I suspect if it does it does it via a negative feed to a relay. Is this correct, or am I barking up the wrong ECU.............

No idea on this one. From the diagrams, for the fan motor to work, the coil needs to be energised, and I can't see where it would get the power from. We need a sparky pronto.

[Rhinoman]

According to the schematics only the scavenger fan can run when the engine is off.

[widdowson2008]

According to the schematics only the scavenger fan can run when the engine is off.

And the solenoid part of the relay connects to the ECU, pin 3X.
Hi James
How is the exploration into the bowels of your ebay ECU progressing?

[Rhinoman]

Hi James
How is the exploration into the bowels of your ebay ECU progressing?

I'm not due to receive it for a couple a days.

[g8dhe]

Geoff
To complete the ECU schematic, I am looking for the circuits connected to ECU pins:
2D, 2E, 2O, 2P
3A, 3B, 3C, 3D, 3J, 3L, 3R
Can you point me in the right direction? or even better, can you email the relevant pages so I can print them off please?

OK see PM

[g8dhe]

Is the power just for the memory? Can the ECU supply power to the fans when ignition is off? I suspect if it does it does it via a negative feed to a relay. Is this correct, or am I barking up the wrong ECU.............[/color]

Can't say specifically as I don't have a circuit diagram for the ECU, but more than just the memory as things like the Scavenger Fan relay are operated from it when the Ignition is off!
But there are two other power connections Pins 1C & 1D that are switched via the Ignition key - part of this might be safety as you don't want other fans etc kicking in if it goes wrong!
Which side is switched depends on the load, Relays and Solenoids are seem to be high-side switched (supplied with +12v) whilst dashboard lights etc are given an earth to light them.

[widdowson2008]

Another query?

Thanks for the pm Geoff.

What does FICD stand for?

[rita]

Another query?

Thanks for the pm Geoff.

What does FICD stand for?

Fast Idle Control Device