jgl1

2008 E320 CDI, 75K miles

Vehicle started readily yesterday, sat overnight and then today the engine fails to crank. Two separate ignition keys are tried, each is recognized by the ignition switch, each turns readily but the engine remains silent. The battery is fully charged. If the key is left in the "On" position for approx. 5 seconds, the engine's electric cooling fan activates at maximum speed, even though engine is cold and A/C is off.

Fault code check reveals:

ETC – Electronic Transmission Control

Event C100 – No CAN message was received from engine management control unit.

Event D10B – No CAN message was received from engine management control unit.

ABR – Adaptive Brake

Event 4759 – No CAN message was received from engine control module.

Event 4840 – No CAN message was received from engine control module


Driver’s SAM

9040 – Component N10/1kO (fan relay module) is defective or not installed.

Event 9090 – Fault in CAN communication with control unit Overhead Control Panel.


SCM (MRM) – Steering Control Module

9348 – No CAN message was received from engine control module.




RecETR-LF-left front reversible emergency tensioning retractor

Event 5024 – Fault in CAN comm with control unit ME motor electronics.
Event 5025 – Fault in CAN comm with control unit ME motor electronics.
Event 5024 – Fault in CAN comm with control unit ME motor electronics.
Event 5025 – Fault in CAN comm with control unit ME motor electronics.

RecETR-RF- Right front reversible emergency tensioning retractor

Event 5024 – Fault in CAN comm with control unit ME motor electronics.
Event 5025 – Fault in CAN comm with control unit ME motor electronics.


ASSYST – Active Service System
9204 – Control unit ASSYST is not receiving any messages from the engine compartment CAN bus.


Possibly related to this situation - or not - the vehicle was serviced the day prior for several CDI5 (Common Rail Diesel Injection) faults:

* 2513-1 Component M55 (inlet port shutoff motor); positioner signals fault.
* 2531-2 Component M55; positioner signals fault Y.
* 2520-1 Component R48/1 (thermostat); short circuit to positive.
* 2502-2 Component R48/1; short circuit to ground.
* 2520-4 Component R48/1; signal line is interrupted.
* 2520-8 Component R48/1; thermal overload of control module N3/9 (CDI control unit).


Of merit was that with the engine cold, the fault codes could be cleared, the ignition turned on and fault codes rechecked, and with a stone cold engine the thermal overload of the CDI would still be reported.

Renewal of the inlet port shutoff motor was deferred but the thermostat temperature sensor was cleaned and the pressure control valve hose, # 642 010 08 91, which has a heater element in line, was renewed, which eliminated all of the R48/1 fault codes.

The vehicle was driven after renewal of the thermostat; the engine started readily and no faults were noted other than the lack of performance and "Check engine" light related to the faulty port motor.

Is this no start situation possibly related to the "overheated" CDI control module (whose fault code has not reappeared since yesterday's service) ... or is today's no start debacle related to another control unit fault?

Thanks for the help.

klimis

Same problems with my w219 CLS 350 CGI except electric cooling fan but most fault codes are the same. Anyone find a solution? some modules cant communicate with engine ECU. SOFTELECTRONIC has double checked ECU and say that everything is ok. jgl1 did you find any solution?

jgl1

A reinspection of the fuses - using a DVOM - found a blown fuse in the left side engine compartment fuse box. The initial visual inspection of the fuses revealed no faults. The blown fuse was renewed and the system has run flawlessly ever since.