Basically if you were to take your X to a Nissan dealer for a problem that you didn't know how to fix. The dealer would use this type of software to basically fix it. If they know what the issue is then they get jump to the software and it tells ya all sorts of stuff. Here is an example if this works. Cause I used to get a check engine light in my '04 for code P0171. I used the software to look up the code and this is what I get.
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
On Board Diagnosis Logic
On Board Diagnosis Logic
With the Air-Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).
DTC Confirmation Procedure
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 5 seconds before conducting the next test.
WITH CONSULT-II
Start engine and warm it up to normal operating temperature.
Turn ignition switch OFF and wait at least 5 seconds .
Turn ignition switch ON and select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II.
Overall Inspection Sequence
Clear the self-learning control coefficient by touching "CLEAR".
Select "DATA MONITOR" mode with CONSULT-II.
Start engine again and let it idle for at least 10 minutes . The 1st trip DTC P0171 or P0174 should be detected at this stage, if a malfunction exists. If so, Go to "Diagnostic Procedure" below.
If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal. If engine starts, Go to "Diagnostic Procedure" below. If engine does not start, check exhaust and intake air leak visually.
WITH GST
Start engine and warm it up to normal operating temperature.
Turn ignition switch OFF and wait at least 5 seconds .
Disconnect mass air flow sensor harness connector. Then restart and run engine for at least 5 seconds at idle speed.
Stop engine and reconnect mass air flow sensor harness connector.
Select MODE 3 with GST. Make sure DTC P0102 is detected.
Select MODE 4 with GST and erase the DTC P0102.
Start engine again and let it idle for at least 10 minutes .
Select MODE 7 with GST. The 1st trip DTC P0171 or P0174 should be detected at this stage, if a malfunction exists. If so, Go to "Diagnostic Procedure" below.
If it is difficult to start engine at step 7, the fuel injection system has a malfunction.
Crank engine while depressing accelerator pedal. If engine starts, Go to "Diagnostic Procedure" If engine does not start, check exhaust and intake air leak visually.
Wiring Diagram
EC-FUELB1-01
EC-FUELB2-01
Diagnostic Procedure
Diagnostic Procedure (Steps 1 - 3)
Diagnostic Procedure (Steps 4 - 6)
Diagnostic Procedure (Steps 7 - 8)
Diagnostic Procedure (Steps 9 - 10)
