Without Scan Tool
DIAGNOSTIC FUNCTIONCHECK N RANGE LIGHT
The N range light flashes once per second if there is an abnormality in any of the items in the table which are related to the A/T system. Check for diagnostic trouble codes if the N range light is flashing once per second.
N range light flashing items
^ Input shaft speed sensor
^ Output shaft speed sensor
^ Each solenoid valve
^ Gear incorrect ratio
^ A/T control relay system
CAUTION: If the A/T TEMP warning light is illuminated, it means that the transmission fluid temperature is too high. Stop the vehicle in a safe place and wait until the A/T TEMP warning light extinguishes.