Wyersmith
Active Member
- Joined
- Sep 9, 2013
- Messages
- 25
- Reaction score
- 1
- Location
- Norfolk UK
- Your Mercedes
- 2000 CLK 230k W208448
Hi, I'm looking for some advice on where the best places to look for poor earth/connectivity to the ESP module might be.
I've had a recurring but unpredictable fault on my 2000 W208 for about 2 weeks. When driving, ESP warning comes up, speedo and milometer fails, and locks in whatever gear it was in when fault threw. Stop and restart and the fault clears but reoccurs whenever it fancies. could be 20 miles, could be 20meters.
Faults started after having exhaust welded and front suspension looked at for knocking. front wheel speed sensor changed and all wheel speed sensors checked and working on a ramp with STAR.
Star brings up following codes:
Electronic Selector Module
P1876 - Signals sent by control unit N47 for the wheel speeds and braking torque are not available on the CAN bus. (current and stored)
ESP
C-1000-016 - Check control Unit N47-5 (ESP and BAS control Module) Check Power supply of component N47-5 (stored)
Vacuum Pump Brake Booster
C1025 - No or incorrect CAN message from control Unit N47-5 (stored)
ICM - Instrument Cluster
B1101 - Fault in CAN communication with control Unit N47-5 (stored_
B1110 - Communication through the interior CAN bus is faulty (current and stored)
From codes MB indy chap thinks it's more likely a CAN bus problem (shorted wire etc) than a faulty N47 and suggests a few hours chasing bad wires before going for a new ESP module (sounds pricey to me!)
The indy chap who does my other car and has been excellent thinks its more likely power to the N47 or bad earth somewhere. He thinks this could be creating the CAN bus problems.
so, any help on where the best places to check for a bad connection/earth would be much appreciated. I will also pull the relay and see what that's doing (is it ok to manually close relay to see if this takes ESP warning light out?). also, is it possible to test the circuits into the N47 (ESP) with the 'scart' connector using a multimeter? and would that help at all?
any suggestions would be much appreciated as this is annoying the hell out of me and as you can tell, I'm not much of a mechanic...
Thanks in advance
Wyersmith
I've had a recurring but unpredictable fault on my 2000 W208 for about 2 weeks. When driving, ESP warning comes up, speedo and milometer fails, and locks in whatever gear it was in when fault threw. Stop and restart and the fault clears but reoccurs whenever it fancies. could be 20 miles, could be 20meters.
Faults started after having exhaust welded and front suspension looked at for knocking. front wheel speed sensor changed and all wheel speed sensors checked and working on a ramp with STAR.
Star brings up following codes:
Electronic Selector Module
P1876 - Signals sent by control unit N47 for the wheel speeds and braking torque are not available on the CAN bus. (current and stored)
ESP
C-1000-016 - Check control Unit N47-5 (ESP and BAS control Module) Check Power supply of component N47-5 (stored)
Vacuum Pump Brake Booster
C1025 - No or incorrect CAN message from control Unit N47-5 (stored)
ICM - Instrument Cluster
B1101 - Fault in CAN communication with control Unit N47-5 (stored_
B1110 - Communication through the interior CAN bus is faulty (current and stored)
From codes MB indy chap thinks it's more likely a CAN bus problem (shorted wire etc) than a faulty N47 and suggests a few hours chasing bad wires before going for a new ESP module (sounds pricey to me!)
The indy chap who does my other car and has been excellent thinks its more likely power to the N47 or bad earth somewhere. He thinks this could be creating the CAN bus problems.
so, any help on where the best places to check for a bad connection/earth would be much appreciated. I will also pull the relay and see what that's doing (is it ok to manually close relay to see if this takes ESP warning light out?). also, is it possible to test the circuits into the N47 (ESP) with the 'scart' connector using a multimeter? and would that help at all?
any suggestions would be much appreciated as this is annoying the hell out of me and as you can tell, I'm not much of a mechanic...
Thanks in advance
Wyersmith