1989-1994 Nissan Common OBD-I codes
-Access the ECU and position it for observing the diodes.
-If the engine does not run, turn the key on and proceed to step #4.
-Start the engine and warm it to operating temperature then idle.
-Turn the diagnostic mode selector on the ECU fully clockwise until both diodes flash 3 times then turn the selector fully counterclockwise. The ECCS system is now in mode 3.
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