Passat L4-1984cc 2.0L DOHC (9A) (1990)
^ press Q button to enter input
^ display will appear as shown
Key to Function 04 and O8 channel display
Function O8/channel 9 display, interpreting
Channel 9 provides the technician with essential information that would have to be verified manually before performing the basic engine settings.
The ECU scans the system for certain conditions that must be met or for certain components that must be present or operative. It then assigns the
numerical values (listed in the table) to these conditions or components and ADDS them together to create the display value.
A value of zero will be assigned to conditions or components in the chart that are NOT MET or NOT PRESENT.
Note
By analyzing the value displayed in channel 9 (using simple addition or subtraction) you can easily determine if a component or a condition is
present or not.