To read a check engine code a person will need a code reader. They can also take their vehicle to an Auto Zone store and have them read the codes and explain what they mean for free.
Check for codes if you have a check engine light illuminating.
If the check engine light is on with no codes, you have a wiring or computer issue.
To check the MIL (Malfunction Indicator Lamp) codes on a 1990 GMC Suburban, you can use an OBD-I scanner or a paperclip for a manual method. Locate the diagnostic connector under the dash near the driver's side. Use a paperclip to short terminals A and B on the connector, then turn the ignition to the "On" position without starting the engine. The check engine light will flash a series of codes that indicate any trouble codes stored in the vehicle's computer.
turn the key on and off 3 times and count the check engine flashes
55 Means End of Code... Its nothing to worry about. Just means there is no codes
There is no OBD connection on a 1990 Nissan as that is an OBD1 vehicle not OBD2. However there is a way to read the codes. https://codes.rennacs.com/Petrol-Engine/Japanese-Korean/Nissan-Engines.php
on top of the computer you should find a wiring harnes one of them dose not have a end. and that is war you plug it in. on the right kick panel.
what is code 14 in Honda civic 1990
To read diagnostic codes on a 1990 Nissan 300ZX, first, locate the diagnostic connector under the driver's side dashboard. Use a jumper wire to connect terminals E1 and TE1 in the connector. Then, turn the ignition key to the "on" position without starting the engine; the check engine light will blink the diagnostic codes. Count the blinks to interpret the codes according to the Nissan service manual for troubleshooting.
Have vehicle scanned to determine problem and recover codes Could be a bad coolant temperature sensor
It could be the coil pack or the crankshaft position sensor. run the codes by turning the key on, off, on, off, on without turn the key to start position. shotly after the check engine light goes off, the check engine lght will flash 2 digit fault codes. if 11 is one of the codes its likely a bad crank sensor.
The check engine light cannot be retrieved on a 1990 Cavalier unless a problem develops with the engine. The engine can be checked for errors, though, by using a tester that is plugged into the vehicle's computer.