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2.0 tdci (Mondeo mk4 / s max) – PCM (ECM) relay click & battery drain

Petri-of-Finland
Petri-of-Finland
in Ford Mondeo / Vignale Club

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Hello from Finland to all Fordsters!

 

My 2008 s max 2.0 tdci keeps PCM (ECM) relay R2 clicking occasionally after stopping the engine, resulting battery draining so that I have to jump start the car.

Relay R2 clicking happens in consistent sequence (clicks after every two minutes).

Sometimes this R2 clicking does not happen and car starts well even after parked for days.

 

Battery & charging are both OK.

 

Googling showed me that I’m not the only one that have had this issue, but so far I haven’t found workaround for this (except that I installed a rocker switch in series with fuse F7 which is the drive for relay R2. I have to turn my switch to OFF if parking for longer time

-this works, but is not a sophisticated solution...)

In the past I was measuring the current drain and it went like this:

-Relay R2 clicks>> Starts with 2...3A drain

-Current drain gets continuously smaller by time

-After ~2 minutes drain is almost zero

>> R2 clicks again and the same sequence continues again and again

 

Does anyone know from where (and why) relay R2 gets such sequential activation?

Has anyone managed to find the root cause & fix for such occasional issue?

 

Any tips & experiences highly appreciated!!!

Stay well (isolated in your Ford ?)

Regards Petri

Helsinki, Finland

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