i have searched many places but couldnt find any explanation regarding circuit 50 code that i am getting from my 1990 190e. what could cause to this code or what is circuit 50? car runs drives fine. i erased the code incase if its an old code left there but it comes back so i need to adress it. thank you very much for your help.

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What do you mean circuit 50? Is your check engine light on? How many blinks are you getting from the LED?

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1990 190E 3.0L

i am having 9 blink out of number 14 socket.. i the list that supplied to me with the code reader it says circuit 50 failure. yes my check engine light on but thats i think another story... my o2 sensor is not even plugged in... thanks for your response any idea what could it be?

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Try this:
W201 Error Code
1 No fault found.
2 Throttle position switch - wide open throttle (WOT), signal faulty
3 Engine coolant temperature sensor faulty
4 Air flow sensor position potentiometer voltage illogical
5 Oxygen sensor signal illogical
6 Not used
7 TNA/TD signal (RPM) read by CFI control module
8 Altitude pressure signal from ignition control module illogical
9 Electronic hydraulic actuator (EHA) current faulty.
10 Throttle position switch - closed throttle position fault (idle)
11 Air injection system, open or short circuit
12 Absolute pressure values from EZL ignition control module are illogical or Exhaust gas recirculation temperature sensor
13 Intake air temperature reading is illogical
14 Vehicle speed signal read by CFI control module is illogical
15 Not used
16 Exhaust gas recirculation switchover valve, open or short circuit
17 Oxygen sensor is shorted to positive or ground
18 Current to idle control valve is illogical
19 Not used
20 Not used
21 Not used
22 Oxygen sensor heater voltage illogical
23 Short circuit to positive in purge switchover valve circuit
24 Not used
25 Short circuit to positive in start valve circuit
26 Short circuit to positive in upshift delay solenoid valve circuit
27 Data exchange between CFI control module and ignition control module interrupted
28 Intermittent contact in engine coolant temperature sensor circuit
29 CFI and ignition control module reading different engine coolant temperatures - Faulty sensor or wires
30 Not used
31 Intermittent contact in engine coolant temperature sensor circuit
32 Not used
33 Not used
34 Engine coolant temperature read from ignition control module illogical

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1990 190E 3.0L

Hi Ismalley, thank you for the detailed list of codes. it appears that eha has a fault in your list. as far as i know its on the fuel distributer right? when i push the accelerator little faster than usual. lets say i give it a full gas, car shakes and hesitates, doesnt kick down properly but if i gradually start to speed no problem. i have a slight miss in the engine but plug wires and plugs are old anyways and getting changed. any chance this could be the reason for shaking and sputtering when full gas or sudden gas given to the car? or should i look for something else? thank you for all

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well since you said the plus and wires are old, I would start with those first. if you have a misfire and you say that if you take off from a stop that the car stutters, I'm inclined to believe the two are cause and effect. check to see that the eha is plugged in, the wires are not frayed and also see if the eha is leaking

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1990 190E 3.0L

hi its beena while since i got on the site so, sorry about delayed response.
Ismalley,
the EHA seems to be OK. it doesnt leak. wires seems to be in good condition. and when i remove the connector there is significant changes so i think eha works good but since i have that faulty eha code i am still keeping it in mind. by the way i changed my plugs and wires with brand new stock bosch ones. there is an impovement with the power but it didnt help with sputtering while hard acceleration and slight missing feel. should i look at coil too? also i havent got an O2 sensor plugged now. i just bought a new one and soldered the leads on the connector. havent plugged it yet (also need some pipe work to do...) so thats whats going on.

is there anything else anybody can advice me? i will also open a new thread since my miss and sputter issue doesnt related to this thread.

thanks very much.

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Ismalley, i looked at the code lists. Threr are codes under cfi and mas controller. My car has a MAS relay. Under MAS list 9 blink says circuit 50 fault.. I dont know i guess i will start throwing parts to it...
Thanks

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