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 below 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 "N" range light is flashing twice per second, it means that the transmission fluid temperature is too high. Stop the vehicle in a safe place and wait until the "N" range light switches off.