Failed to mention, no crank.Hi,
While driving ABS, BAS, ESP Lights came on and went into limp mode but did not stall. No start after shut down. All accessory's work and recently replaced battery at 12.5v.
Thanks for your help!
10a in ecu box, right side of engine compartment. 4th cavity from left or relayFan = module box blower ? Just to make sure. Which fuse is it that blows? I assume the fuse does not blow with the blower unplugged ?
And what is the fuse value that you replaced ?
Ensured shifter is in Park. 12.6v on both sides of fuse but drops to 11.4v and 9.6v during 2 attempts at cranking engine. Acts like a low battery but battery is 4 months old and tests at 12.6v.It is fuse 3 that powers the Transmission Control Unit, the gear shifter, steering angle sensor, and the blower fan motor. a shorted fan motor blows the fuse when you turn the key to position 2. But with the blower wire removed, you remove the short and the engine should start. You say it does not and that is strange.
With the blower connector removed
1) Make sure before you crank the shifter is in P or N (from the instrument cluster).
2) Check the voltage on the fuse (both sides using the tabs on it (with respect to chassis ground when the key is in position 2. It should read 12+ V. Then have someone try to crank the engine. It should still read 12V (should not dip).
It is possible that the blower fan short has caused some track / component damage inside the fuse / relay module. In this case, needs to be replaced.
Sorry, I don’t understand the link question.The link above brings me to the general mercedes forum.
So the fuse does not blow now with the fan plugged in and engine cranked?
Do you have a scanner that you can look at live data from the ECU ?
Picture was of the fuse removed to confirm location."View attachment 2643277 ". This was in your previous post, and I expected to see a picture, but when I click on it, it takes me the "general mercedes" forum.
With the key in position 2, read the live data from the ECU regarding the "start enable= Y/N", " drive authorization = Y/N", shift lever switch = P/N.
It may be an issue with start enable, which is supposed to be Yes, and it is derived from the drive authorization, transmission start enable signal, and the gear status (should be in Park or Neutral).
Start enable=YIf you can, take the screen shots and post them here for the live data. Use the "Attachment" icon (paper clip) and copy the picture files.
Yeah, but I have a feeling that he does not have the 38 pin adapter cable specific for the NT520/530 though.Use that scanner and look in the EIS drive authorization, see what the start enable there says.
EIS is the one that has final say on starting engine... ECU may say start enable = YES, but if EIS says no, that's not happening.
But since you have half a crank, doubtful that's the case... But check anyway.
Use 27mm socket on crank bolt and turn over engine by hand, make sure it's not seized and turns over smoothly. If it does, rules out seized engine.