Testing Serial Data Circuitry — WSU

Testing Serial Data Circuitry — WSU -...

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Testing Serial Data Circuitry When a serial data communication problem occurs on a vehicle, a diagnostic trouble code (DTC) will usually set. The code designation begins with the letter U and is followed by a four digit number. The four digit number indicated which module cannot be communicated with. Always follow the written diagnostic procedure for a UXXXX communication code in the service information. If the written diagnostic routine does not work, then proceed with the following checks. To test serial data circuitry for malfunctions, you will need to know the following: What type of serial data circuit is being tested: CAN, Class-2, Keyword 2000, UART, etc. What is the normal, no communication voltage level? Some systems have a low voltage (near zero volts) when no communication is taking place. Others may have a higher voltage (2.5V, 5V, or 12V) when no communication is taking place. What is the normal communication voltage level?
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