Where is water pump relay

[Adrian 27]

Fault. Code p 2600 water pump open circuit. Changed pump but still same code so please where is the relay. Spent hours looking at diagrams so help much appreciated

 

[Botus]

the exact model of car and engine would help... or better vin

 

[mattkh]

..... Code p 2600 water pump open circuit.

Wow. An electrically operated water pump for the engine.
What a wonderful fuel/emissions efficiency design.

 

[EmilysDad]

Wow. An electrically operated water pump for the engine.
What a wonderful fuel/emissions efficiency design.

Electric engine water pumps have been around for a while. I suspect the OP's water pump is an auxiliary water pump for the heater when parked up or an electric pump to circulate coolant for a set time after the engine is switched off to prevent localised over heating.
And while not technically electric, the water pump on EmilysMums Citroen doesn't get driven all the time .... a motor moves a pulley to drive the water pump when required (I believe its a BMW engine ??)

 

[onefortheroad]

212 e class is it ?

 

[Botus]

Electric engine water pumps have been around for a while.

Wow. An electrically operated water pump for the engine.

yes brilliant stuff - for last 4 years these things on 2009 or newer BMWs like to just stop running whenever they want

 

[ajlsl600]

Electric engine water pumps have been around for a while. I suspect the OP's water pump is an auxiliary water pump for the heater when parked up or an electric pump to circulate coolant for a set time after the engine is switched off to prevent localised over heating.
And while not technically electric, the water pump on EmilysMums Citroen doesn't get driven all the time .... a motor moves a pulley to drive the water pump when required (I believe its a BMW engine ??)

Saving 2 ltre a Yr. And complicating everything. They will be disengaging drive on downslopes next.

 

[malcolm E53 AMG]

I assume it’s the OM651 - did the garage replace with a genuine MB part if not aftermarket are known to be troublesome?

Coolant Pump - Mercedes-Benz OM 651 Service Manual [Page 42]

Mercedes-Benz OM 651 Manual Online: Coolant Pump. The coolant pump ensures that the coolant circulates in the coolant circuit. It is made of plastic, which makes a contribution to weight reduction. Cross-section of coolant pump 1 Belt pulley 2 Control rod 3 Regulating valve 4...

www.manualslib.com

 

[ajlsl600]

Made of plastic.. Tells me all.

 

[EmilysDad]

Made of plastic.. Tells me all.

Coincidentally .... the original water pump on EmilysMum's C3 was plastic. Needless to say it leaked. The new OE replacement was ally ....

 

[ajlsl600]

A step backwards today is often a good thing. Says plastic was dtf and ur alli is, Yr payin, a better job

 

[supernoodle]

If the part shown by malcolm is what is on the OPs car, there are no electrical connections. In which case if you have an open circuit fault, changing the pump won't fix that. It shows as vacuum controlled, in which case there must be an EVRV (electronic vacuum regulating valve) somewhere. An open circuit fault for that would make sense.

First job for OP identify what's fitted.

 

[mioba]

First job for OP

- what model car/engine
- what code reader are you using

 

[supernoodle]

P2600 is specified in ISO15031 2005 as Coolant Pump Control Circuit/Open, it is not manufacturer dependent.
A W212 should be complying to the specs, so code reader won't matter.