2014 Cascadia evo issue

I had one act similar a while back. Turned out to be a bad starter. All power (except ecm) goes through the starter first, it would ground out on the inside of ghe housing and do exactly what you are describing.

 

battery power wires and ground wires run from starter are to MCM small connector

 

btw, any fault codes? may be shut off valve ore low rail pressure?

 

does engine shut down fully ore just idles?

Any fault codes in FR (it is called ADM ore VCI unit on non MB trucks), this is cab drive control ECM near clutch pedal.

If MCM is not powered VCI throws fault code about propriate can failure. BTW, Mercedes uses "tolerant" CAN tranceivers that work in single wire mode with quater speed.

If no VCI codes (its ID is MID128, MCM has no SAE ID, it supports SPN codes, like in Europe), u probably have problem with KL15 relay in Grumd modul (it is ignition power relay). Try to change it. Ignition power on cab ECM and MCM shares one wire. If this power fails - no fault codes, engin shuts dowl like with ignition key

 

BTW... different names of cab ECM. In 90s MB called it FMR, later FR (farzeug regulerung), for non MB vehicels they used to call it ADM, from early 1 to modern ADM-3 (it supports EOBD, J1939, CAN-2, ISO9141 and J1708).

This unit was called VCI on pre Cascadia trucks and it was located in pass side pillar (there were long wires to dash switches and gas pedal) and they relocated it in dash in clutch pedal area.

Not it is called CPC - common powertrain controller. And especially for USA they renamed this system with two controllers to DDEC-10!

Difference of new CPC (ADM) with previous - EOBD support and support of BlueTeck ECM (ACU - aftertreatmet control unit - DEF ore DPF ore DPF+DEF (EPA2014/Euro-6). CPC may limit torque (40%) and speed if aftertreatment system fails.

http://www.crengland.com/sites/default/files/assets/files/Service_Manuals/dd15.pdf

it is for understanding this system.

Ok. U see, that if MCM power supply fails - CPC throws propriate datalink code. If CPC power supply fails - MCM idles only ore runs in limp home mode (1200 rpm).

So if u have no codes, but engine stops, check ignition power supply problems, like relay ore fuse.

Cascadia does not run smoothly, it is rought shaker like a columbia, so relays fail sometimes (no this problem with Actros with the same engine, only with cascadias, argosy and atego/axor/M2).

So try to swap relays, reinstall relevant connectors and fuses.

 

really u need DDDL 7 ore later, I use DDDL-8 and MB Star Diagnise C4.

Mercedes tool is better, but too expencive.I had to purchase it becouse I work on other Daimler Vehicles and DDDL may be used only for powertrain system

 

Ouh, forgot to say

MCM
Kl 15 (ignition) - pin #7 on MCM small connector,
KL 31 (ground, two brown wires, running to starter ground) pins #5 and #6
KL 30 (battery powerm two red wires, secured with nut on starter battery wire) - pins ##11 12

CPC power supply
Connector X2 (ST2),

1 - Battery power (kl30),usually red wire
2 - ground (kl31), brown wire
3-ignition (kl15)


use 21wt bulb to check power and grounds, with poor contanct DVOM reads voltage, but under load circuit may fail, so check wiring under load of bulb.