Starting OM606 by jumping K40 - PeachParts Mercedes-Benz Forum

TimFreeh · #1 06-16-2023, 02:28 PM

Quote:

Originally Posted by Proctor750

There's something weird with the key/ignition where the car only engages the starter for a split second.....

I believe this is an indication something in the drive authorization sequence has failed. The EIS validates the laser key and then sends authorization to the ECU that manages the injection pump to permit operation - no authorization no start. The fact that you can see fuel flowing through the supply/return lines doesn't mean anything - it's a mechanical pump.

The EDC pump control used in the OM606 turbo is not the same as the old purely mechanical pumps of the earlier engines.

I recall testing this on my OM606, it I pulled the fuse that fed power to the EDC control unit the car immediately quit and would not restart until the fuse was present.

Do you have another key? I'd try that.

Again I think you have some sort of drive authorization failure. You won't be able to bypass the stop solenoid or manually jump the K40 start relay without the proper start authorization process being completed.

Proctor750 · #2 06-17-2023, 07:48 AM

Quote:

Originally Posted by TimFreeh

I believe this is an indication something in the drive authorization sequence has failed. The EIS validates the laser key and then sends authorization to the ECU that manages the injection pump to permit operation - no authorization no start. The fact that you can see fuel flowing through the supply/return lines doesn't mean anything - it's a mechanical pump.

The EDC pump control used in the OM606 turbo is not the same as the old purely mechanical pumps of the earlier engines.

I recall testing this on my OM606, it I pulled the fuse that fed power to the EDC control unit the car immediately quit and would not restart until the fuse was present.

Do you have another key? I'd try that.

Again I think you have some sort of drive authorization failure. You won't be able to bypass the stop solenoid or manually jump the K40 start relay without the proper start authorization process being completed.

Understood. Unfortunately I have just the one key.
The car sometimes does nothing in crank position yet other times it will crank for a second or two. Never long enough to clear the massive amount of air that it needs to clear through the hardlines to injectors.

I only wanted to start the motor to confirm it's condition before pulling it out. I will eventually swap a 603 pump on it and install in my w126 so I had not planned on investing in anything w210 related.

Short of a new key and ignition unit it goes into, what other steps might be taken to allow the car to start? Is there a way to jump the pins on the shutoff solenoid?
If unplugged, does it default to open or shutoff?

TimFreeh · #3 06-17-2023, 10:18 AM

Quote:

Originally Posted by Proctor750

Understood. Unfortunately I have just the one key.
The car sometimes does nothing in crank position yet other times it will crank for a second or two. Never long enough to clear the massive amount of air that it needs to clear through the hardlines to injectors.

I only wanted to start the motor to confirm it's condition before pulling it out. I will eventually swap a 603 pump on it and install in my w126 so I had not planned on investing in anything w210 related.

Short of a new key and ignition unit it goes into, what other steps might be taken to allow the car to start? Is there a way to jump the pins on the shutoff solenoid?
If unplugged, does it default to open or shutoff?

I'm not sure if there's a way to operate the EDC controlled pump without cooperation from the EDC control unit. Based upon my prior mentioned experiments with pulling the EDC fuse I suspect its not possible.

I was reviewing some of my DAS information and I came across this link from BenzWhirled.

https://www.benzworld.org/threads/everything-you-always-wanted-to-know-about-das.1245088/

I believe the W210 CDI uses the DAS3 system for start/drive authorization, if the above link is correct the EIS passes data about the rolling code to the ECM where it's validated and a start is authorized. This apparently happens over the CAN so I'd make sure there is power/ground to the EDC control unit.

Without access to Star diagnostic level tools I think this is about all you can do, with Star tools you could go in and see the authorization status of the ECM and if the CAN is active. Not worth the trouble if its just a engine donor that will be mechanically controlled.

What is the history of the W210? DId you buy it as a non-runner for the engine swap project?

Proctor750 · #4 06-19-2023, 02:22 PM

Quote:

Originally Posted by TimFreeh

I'm not sure if there's a way to operate the EDC controlled pump without cooperation from the EDC control unit. Based upon my prior mentioned experiments with pulling the EDC fuse I suspect its not possible.

I was reviewing some of my DAS information and I came across this link from BenzWhirled.

https://www.benzworld.org/threads/everything-you-always-wanted-to-know-about-das.1245088/

I believe the W210 CDI uses the DAS3 system for start/drive authorization, if the above link is correct the EIS passes data about the rolling code to the ECM where it's validated and a start is authorized. This apparently happens over the CAN so I'd make sure there is power/ground to the EDC control unit.

Without access to Star diagnostic level tools I think this is about all you can do, with Star tools you could go in and see the authorization status of the ECM and if the CAN is active. Not worth the trouble if its just a engine donor that will be mechanically controlled.

What is the history of the W210? DId you buy it as a non-runner for the engine swap project?

Also - do you know if the pre-glow has anything to do with the EIS authentication? I.E it won't even allow pre-glow if Authentication is not confirmed?
I ask because I am not getting a glow light on dash BUT I do get a solenoid click intermittently from what I suspect is the shutoff valve. I need to get someone to turn the key while I am under the hood.