BenzWorld Junior Member
Date registered: Aug 2012
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722.6 transmission electrical problems...
I need help diagnosing a 'power supply error' problem to my ML320 transmission.
Currently Carsoft 7.4 is reading the EGS (transmission control Module) as having the faults ;
010: Solenoid valve: Power Supply Error
106: Solenoid valve: Power Supply Error
107: RPM Sensor: Power Supply Error
These faults cannot be cleared. Carsoft is also reading the main 'ME' module as P0702: transmission Control Unit Electrical
P0715: Input/Turbine Speed Sensor Circuit Malfunction
These two faults will clear using carsoft but will return as soon as the car is started up again. But the EGS faults remain
The conductor plate has been replaced just 2 months ago along with all the o'rings, seals and the connector plug etc. I have since removed the 13 pin connector to check for oil but it was all clear and dry as was the TCU. I did not remove the 'male' version of the plug inside the transmission (the one secured by the 7mm nut/screw).
I changed the conductor plate due to errors related to various sensor faults. The vehicle ran fine for appx 2 weeks and then it went in to limp mode again to where i now have the 'power supply errors' to the solenoids and the rpm sensor.
ANY IDEAS...what i could do/check.. I also purchased a second hand 'Transmission control module' but that made no difference.
Also, when I removed the 13 pin connector plug to check for oil recently, I cleaned with electrical contact cleaner and reassembled. The faults cleared at that stage and the vehicle was fine for about day until it went into limp mode again. (having said that i dont know what the exact 'error codes' were then as I had to have the local service tech clear them for me)
The vehicle has done 273K.
Any help appreciated...