Nissan OBD1 Diagnostic Trouble Codes

Step by step guide on how to retrieve troubles codes from Nissan vehicles 1995 and earlier, including code chart.

Begin with the vehicle on level ground, engine off with the emergency brake set.

Step 1 - To boot the computer in mode four make sure the key is in the "OFF" position. Next locate the mode switch on the computer which is either a small toggle or a screw style switch. The screw style switch is activated by turning the screw one way then back the other way.

Step 2
-  Turn the key to the "ON" position without starting the engine, next flip the switch or turn the screw. The led light will blink one time for mode one, then two times for mode two, three times for mode three.

Step 3 - When the lights blink four times this is the mode needed to display the trouble codes, flip the switch or turn the screw back. The led light will now blink out the trouble code or codes, the computer must be in mode four to retrieve the trouble codes.

Step 4
- The first led light will blink the first digit of the code number, there will be a pause then the remaining led light will blink out the second digit of the trouble code. For example, if the first led light blinks one time, and the second led light blinked two times the code number would be 12. Some Nissan models are equipped with just one led light in this case the light will blink the first part of the code pause, then continue with the second number of the code. Once repairs have been made the computer codes can be cleared by disconnecting the negative battery terminal for three minutes and then reconnect it.

Helpful Information

A diagnostic code is helpful when troubleshooting a particular problem that has occurred. After the trouble code is defined the problem can be repaired and rechecked. Early Nissan check engine lights are not used to blink out a trouble code like on most vehicles but instead use a mode and retrieval method. Most computers are located behind the glove box, under the passengers seat or in the center console depending on year and model and is set up to work in five different modes, the first three modes of operation are used for the manufacturing and assembly process, mode four is used for trouble code output sequence and mode five is used to read oxygen sensor outputs.

Nissan Trouble Codes

Code 11 Crank angle sensor

Code 12 Mass airflow sensor

Code 13 Engine coolant temperature sensor

Code 14 Vehicle speed sensor

Code 21 No ignition reference

Code 22 Fuel pump

Code 31 Engine control unit

Code 32 EGR sensor

Code 33 Oxygen sensor

Code 34 Knock sensor

Code 35 EGR temperature sensor

Code 43 Throttle position sensor

Code 45 Injector leak

Code 51 Injector circuit

Code 54 Automatic transmission signal

Code 55 No malfunction recorded

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