log

Best way would be to measure the resistance of the solenoid directly. Probably easiest on a V6 or for somebody using a pigtail to plug the connector, just because it would be difficult getting probes on the pins from what I remember from disconnecting mine.

Regarding resistors, some of those "anti hyper flash" ones for upgrading to LED turn signals may be an option. Low resistance, but could be wired in series. Use the other side of one of the pigtails and it should be a plug and play solution once we know a target resistance.

CaliBenzDriver

JR will calculate that, once he can get exact limits of the ECU keeps measuring

For me any resistor bigger than 1W calls for a more practical solution. I am not into roasting plastics...

If you don't like to use a bulb, then wire up the coil of a spare relay.

The lower limit may be 150mA, it's a pulsed digital voltage from 10 to 90% duty.

This dummy load only useful if a specific range of ECU pop CEL... perhaps these ECU use reverse logic we don't know about. "Power needed to shut solenoid" ???

​​​​​​Don't make the wrong assumption to disregard what you don't know (I don't know that for sure either).
If i were you... I'd keep that all factory plugged until you can confirm how your engine controls interacts with your oil pressure.

And while at it perhaps we can all understand why your engine has CEL this mod....

PeterUbers

Or can you buy another solenoid and plug the engine harness into this ... and leave it dangling or zip tied ... the OEM solenoid will remain unplugged

CaliBenzDriver

That's nice and easy all right. ✌️

There is a harness inside the timing cover/oil pan... I am not sure the connector of solenoid and the external connector style will match without internal harness... 50/50, right?

zk2004mb

Sounds like the best option for me. The connector + actual solenoid
I'm away from my desk with WIS. Wondering if anyone can help find the part number

kevm14

My brother in law just bought a 2017 GLS550 with 131k. M278. Thing runs flawlessly. I helped him unplug but he has a P0496 evap code (which he probably caused by not tightening the gas cap). Chasing that will make it tough to immediately notice if unplugging is causing a CEL.

I think a good way to get through this is to look for a P06DA00 via OBD-2 generic. It should NOT appear there, but if it does, you have a "lucky" ECU....

zk2004mb, please check for codes via OBD-2 generic mode and report back.

JettaRed

iTrader: (1)

Holy cow! What a brainiac! That is seriously a viable option.

log

278-180-04-15 appears to be the solenoid. Actual picture of the part here: https://www.autohausaz.com/pn/MB-2781800415

It appears the solenoid should plug directly into the external harness without the need for the internal intermediate connector.
The internal connector is listed as individual pieces with a housing part number of 029 545 10 26. Scrolled back through this thread and found that matches the housing that plugs into the outside of the timing cover.

References: EPC section 18-015 (engine lubrication->oil pump), post 484 in this thread.

JettaRed

iTrader: (1)

A2781800415.



https://www.fcpeuro.com/products/mer...800415#fitment

CaliBenzDriver

Let's try to get to the bottom of this issue for our collective interest:

"Unplugging oil pump control solenoid triggers CEL in M157278 MY'15 S63-Coupe ".

-- Perhaps the crankcase or intake pressure upsets some of ECU expectations. Perhaps the engine came equipped with an optional oil sensor. Something's different!!
​​​​​
-- Based on all known reports thus far, ECU does not CEL open solenoid circuit.


-- Let use a reputable scanner (Xentry, Launch, ...) with a solid scan of at least the ECU.


​​​​​​

zk2004mb

I'd love to get to the bottom! Any member here live in north nj or nyc area has Xentry bench I can borrow?
I could be totally wrong with the conclusion from the inferior scanner.

Also, it's m157 not m278

PeterUbers

see post #526 in this thread

zk2004mb

I tried generic OBD2 which utilized ISO 15765-4 protocol.
In the OBD2 generic menu, there are 3 components, engine, AT and FPCM-FuelPumpCtrl.
There is only one code found in the engine category which is P06DA. The rest of two categories passed with no problem.

CaliBenzDriver

Thank you for pointing that out Peter

We can say that some ppl with M178 and 4Cyl have reported an active CEL from faulty pump solenoid circuit.
That's interesting!

Again I would recommend not to disconnect factory systems hopping nothing's changed. Bosch excels at managing zillions of different options. Who knows what combination they wanted to test ?

I'd recommended to open a thread under affected chassis forum or in Tech Talk... then we can try to help with specifics.

Here is a course of actions:
-- check live oil pressure activity
-- check solenoid linked to DTC
-- Test dummy load (bulb or solenoid)

Outcome CEL is reworked to be bypassed.
✌️

ImolaSix

The M157 S63 has an oil pressure sensor so perhaps the ECU is able to see oil pressure not following the usual 2 and 4 bar logic with the solenoid unplugged and triggering a CEL. Doubt a generic OBD would see this as it's probably a unique code.
If this is the case, then simply plugging in a dummy solenoid will not remove the CEL.

CaliBenzDriver

Looks like you do have a short straw... we'll try to help you out with a cost efficient solution.

Go ahead and create a new thread under your own chassis forum.

We'll try to help you remove all the bad to enjoy nothing but the good.


​​​​​

zk2004mb

Thank you! I opened a thread in tech talk. Not much traffic in C217 forum and I want to broadcast this topic to more chassis
https://mbworld.org/forums/mercedes-...es-me-cel.html

63sGeo

Do you happen to know the part number for this harness?

Thank you!

63sGeo

Do you happen to know the part number for this harness? Just confirming it is 2711 500 156
https://www.fcpeuro.com/products/mer...des-2711500156

Thank you!

JettaRed

iTrader: (1)

Or this...





https://www.aliexpress.us/item/32568...21877770170%21

63sGeo

Thank you very much!

Siegmann

Tasos has spoken:

sirrom223

damn, beat me to it!

JettaRed

iTrader: (1)

It helps to display the transcript and slow down the video (I normally watch at 1.25x). At first I thought he was saying the oil pump won't last 15,000 km, but he's saying the OIL won't last 15,000 km. Mine never lasted that long because I change it religiously every 5000 miles.

BDC90

So His take is a healthy engine could have accelerated wear due to cold weather start-up stress in a cold climate when unplugged.