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!
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
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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