Mercedes W169 Start Problem

[ascotauto]

Hi Guys

I am in need of some tech input please. I have a W169 A170 MB with a intermittent start problem. Sometimes especially when it is cold ignition turns but engine does not crank. When i test with mb star in eis and live data for drive authorisation when it does not crank it says drive authorisation not sent. Start enable - No. Am i dealing with a faulty eis or ecu. There are no stored codes either so its making me run around a bit. Is dry joints in eis possible or common rather? Any ideas or tips to solve this will be greatly appreciated.

[Meat-Head]

*WICKED*

Is this an auto or a manual?

Make sure you keep this thread updated.

Thanks.

[ascotauto]

its a auto thanks mr meat

[Meat-Head]

*WICKED*

SO COOL.

Perhaps, you could open the hood, stupid ecu under stupid cover beleive is the auto ECU.

Perhaps you could figure out if it drives the starter motor direct when cranking?

this is going to be one of them AWSOME threads that can be used in a pub quiz, great.

[ascotauto]

Pub Quiz i did check if the ecu drives the starter but i can see the same colour wire at the ecu. Does it change anywhere? I did strip the harness in front and inside under the carpet to trace it but no luck.Its a thick purple with white trace but i couldnt see it. Anyone knows in fact where it does go to. Under the battery is a fuse box had that out too still nothing.

[Meat-Head]

.Its a thick purple with white trace but i couldnt see it. Anyone knows in fact where it does go to. Under the battery is a fuse box had that out too still nothing.

Correct - 3 pin plug blue/ pruple/white & one for the little boy who lives down the lane.

[smayer]

check starter brushes.

[ascotauto]

Hi had it off all fine the problem im expiriencing is that there is no signal to the starter from whatever it is sending the signal esm / ecu / sam?

[smayer]

Hi had it off all fine the problem im expiriencing is that there is no signal to the starter from whatever it is sending the signal esm / ecu / sam?

Post the VIN and I see diagram

[smayer]

In Relay and fuse box you have the K100Km (starter relay), feeded by fuse 21. Try jump from 30 to 87.

[ascotauto]

where is this situated inside or under the hood? its like a faulty relay yes but its location is the issue?

[smayer]

In left hand drive this K100 it's in battery compartment, under passenger seat/foot.

[Ashraf6119]

Hi

Check the fuse # 25 in Steering Column Fuse Box.............Very common to burn from in side and causing non start problem..........

[duplikeytor]

What was the cause of this problem? Faulty EIS?

[PierreTheron]

No i think not