General: 1989-94 Nissan Common OBD-I codes

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-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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