Place ignition switch in On position. On all models except Pathfinder,
Pickup and Van proceed as follows:
Turn diagnostic mode selector on ECU fully clockwise and wait until
inspection lamps flash. Number of flashes displayed indicates
corresponding Mode.
Note number of flashes, then immediately turn diagnostic mode selector
fully counterclockwise. On Pathfinder, Pickup & Van, proceed as
follows:
Turn diagnostic mode selector on ECU to the On position and wait until
inspection lamps flash.
Note number of flashes, then immediately turn diagnostic mode selector
to the Off position.
On all models, when ignition switch is turned Off during diagnosis, in
each mode, and then turned back on again after power to the ECU has
dropped off completely, diagnosis will automatically return to Mode 1. For
description of modes, proceed as follows:
Mode I (Mixture ratio feedback control monitorA): During a closed loop
condition, the green inspection lamp turns On when lean condition is
present and goes Off when a rich condition is present.
During a open loop condition, the green inspection lamp stays Off.
Mode II (Mixture ratio feedback control monitor B): During a closed
loop condition, the red inspection lamp turns On and Off simultaneously
with the green inspection lamp when mixture ratio is controlled within a
predetermined value.
During a open loop condition, the red inspection lamp stays Off. The
green inspection lamp function is the same as Mode 1. Mode III
(Self-diagnosis): In this mode the diagnostic trouble code is indicated by
both the red and greed inspection lamp. The red inspection lamp
corresponds to units of ten and the green inspection lamp corresponds to
units of one. Mode IV (Switches On/Off diagnosis): During this mode, the
inspection lamps monitor switch On/Off condition of the throttle valve
switch, starter switch and vehicle speed sensor. Mode V (Real time
diagnosis): If a malfunction is present during a driving test, the
inspection lamps will display the malfunction condition immediately.