Me7.1.1 engine aux water pump after run

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R32Dude

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	Me7.1.1 engine aux water pump after run « on: September 16, 2023, 08:01:49 AM »

How does the ecu control the aux water pump after ignition is turned off? The only power to the pump is from a relay controlled by the ecu, which no longer is running any code.


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nyet

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	Re: Me7.1.1 engine aux water pump after run « Reply #1 on: September 16, 2023, 09:44:01 AM »

Quote from: R32Dude on September 16, 2023, 08:01:49 AM

How does the ecu control the aux water pump after ignition is turned off? The only power to the pump is from a relay controlled by the ecu, which no longer is running any code.

afterrun pump coolant thermostat


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R32Dude

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	Re: Me7.1.1 engine aux water pump after run « Reply #2 on: September 17, 2023, 06:23:25 AM »

Im looking into patching some code to keep small aux pump running for 5 minutes after the ignition is switched off. I found the code where B_zwp is set but Im confused as how the ecu would act on the pump after 5 minutes when the ignition is off and I've already locked up the car. Is it possible to do such a thing?


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BlackT

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	Re: Me7.1.1 engine aux water pump after run « Reply #3 on: September 17, 2023, 11:03:29 AM »

Ecu is awake as long as the ECM relay is turned on(controled by pin 21)

What car it is? On what pin is aux pump relay?


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nyet

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	Re: Me7.1.1 engine aux water pump after run « Reply #4 on: September 17, 2023, 12:25:24 PM »

Quote from: R32Dude on September 17, 2023, 06:23:25 AM

just use a lower after run temp thermostat. much easier. circa 2001 mod.

more info here https://www.audizine.com/forum/showthread.php/640569-C5-RS6-afterrun-coolant-pump-lower-temp-thermostat


« Last Edit: September 17, 2023, 12:27:00 PM by nyet »	Logged

R32Dude

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	Re: Me7.1.1 engine aux water pump after run « Reply #5 on: September 18, 2023, 04:45:50 AM »

Quote from: BlackT on September 17, 2023, 11:03:29 AM

Ecu is awake as long as the ECM relay is turned on(controled by pin 21)

What car it is? On what pin is aux pump relay?

2008 R32.ME7.1.1 ST10 Aux pump relay controlled by ECU pin 48.
The ECU needs power at pins 3,21,62 .

Pin 3 and 21 go through relays to get power. Only the pin 3 relay is controlled by the ECU (by Pin23). Pin 21 relay is controlled by the "Multifunction control module relay #2"

Pin 62 is either permanently on or through the ignition switch.

How does the ECU determine that the after-run has finished and shuts down the relay you mention?

Quote

just use a lower after run temp thermostat. much easier. circa 2001 mod.

Unfortunately the R32 doesn't seem to have one of these, just a standard thermostat.


« Last Edit: September 18, 2023, 04:59:17 AM by R32Dude »	Logged

BlackT

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	Re: Me7.1.1 engine aux water pump after run « Reply #6 on: September 18, 2023, 06:00:51 AM »

Quote from: R32Dude on September 18, 2023, 04:45:50 AM

2008 R32.ME7.1.1 ST10 Aux pump relay controlled by ECU pin 48.
The ECU needs power at pins 3,21,62 .

Pin 3 and 21 go through relays to get power. Only the pin 3 relay is controlled by the ECU (by Pin23). Pin 21 relay is controlled by the "Multifunction control module relay #2"

Pin 62 is either permanently on or through the ignition switch.

How does the ECU determine that the after-run has finished and shuts down the relay you mention?

Unfortunately the R32 doesn't seem to have one of these, just a standard thermostat.

Sorry I don't know that. Try to look in MED 9 FR, log some variables

1.8T also use ECM relay so it might be in ME7 FR something about ECM relay


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tao13

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	Re: Me7.1.1 engine aux water pump after run « Reply #7 on: September 18, 2023, 09:08:34 AM »

3 years ago i put a file from 1.8t BAM 8N0906018H (it had aux water pump
) to a vw polo 1.8t witch had aux water pump and this 06A906032TL but the aux water pump not worked with 8N0906018H file.
So i think in ecu file exist something to control the relay and aux pump.


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R32Dude

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	Re: Me7.1.1 engine aux water pump after run « Reply #8 on: September 21, 2023, 05:58:29 AM »

Looks like its easy. Just a couple of maps to keep radiator fans on at low duty cycle and activate at lower temp at after run.


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