In 1994, the Nissan Maxima was still using the OBD-I (On Board Diagnostics version one) computer programming. This system
featured on-board diagnostic capability with five manually accessed diagnostic modes. By entering diagnostics manually
and selecting mode number three,
BMW ICOM A3 Pro trouble codes related to component or system faults stored in the on-board computer
memory could be retrieved. The codes could then be used to identify code-specific diagnostic routines. The Nissan
enthusiast can read access codes in a few minutes and be well on his way to diagnosing performance and driveability
problems.
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Remove the trim panels in front of the center console. Locate the engine computer attached to a floor-mounted bracket on
the transmission tunnel between the console and the firewall.
Turn the diagnostic mode selector,
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the small red and green LED lights on the side of the computer next to the mode selector. They will flash to indicate the
modes, with a pause between each mode. One quick flash is mode one, two quick flashes is mode two and so on. When the
light flashes indicate mode three, quickly turn the mode selector counterclockwise until it stops. You have entered mode
three diagnostics.
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Observe the red and green LED lights on the side of the computer.
UPA USB Programmer The red light flashes to indicate the "Tens" digit of
the code and the green light flashes to indicate the "Ones" digit of the code. For example, if the red light flashes two
times and the green light flashes seven times, this would indicate code 27.
Turn the ignition key off for two minutes to exit diagnostics. The computer will automatically return to mode one for
normal operation.