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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

Mercedes Benz A-Class W169 (2004 - 2012)

  • Loney911
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3 years 11 months ago - 3 years 11 months ago #52174 by Loney911
Mercedes Benz A-Class W169 (2004 - 2012) was created by Loney911
I’m having transmission fault 1634 - Component Y3/9N1 (CVT (Continuously Variable Automatic Transmission) Control Unit) Is Defective Or The Voltage Supply Is Faulty
How I can confirm whether it’s a control unit  fault or voltage supply fault 
Last edit: 3 years 11 months ago by Loney911.

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3 years 11 months ago #52197 by Loney911
Replied by Loney911 on topic Mercedes Benz A-Class W169 (2004 - 2012)
Can any one got any idea?

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  • juergen.scholl
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3 years 11 months ago #52199 by juergen.scholl
Replied by juergen.scholl on topic Mercedes Benz A-Class W169 (2004 - 2012)
Is this a power train error code starting with the suffix P or is this hexadecimal code?


With the corresponding wiring diagram locate the relevant power supplies and ground connections of the control unit. Then, under load condition - with the engine running and the transmission connected - measure these power supplies and ground connections for the correct voltage levels.
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3 years 11 months ago #52242 by Loney911
Replied by Loney911 on topic Mercedes Benz A-Class W169 (2004 - 2012)
No suffix just 1634 and 1629

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