![]() ![]() To keep the codes stored, simply turn the key off as the check engine Wait 5 seconds, then turn the screw fully counter clockwise.ĥ. To clear all computer codes and turn the check engine light off, turn the screw fully clockwise while it is in diagnostic mode. The long flash(s) = 1st digit short flashes = 2nd digit.Ĥ. The check engine light will then begin to flash stored fault codes. Wait 5 seconds, then turn the screw fully counter clockwise.ģ. Turn the 'diagnostic mode selector' screw on the computer fully clockwise. computers have either a small toggle switch on the side of the ECU box or, a slotted mode selector screw that turns 1/4 or 1/2 turn clockwise and counterclockwise to do the same task.ġ. Access to the computer is gained by sliding the seat forward or, by removing the seat entirely. ![]() Nissan Truck/Car OBD 1 Codes and Code Retrievalġ986-1989 D21 Nissan Hardbody Truck Codes
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