Nissan OBD / OBD2 Codes

• Accessing Codes
  • Using (MIL) 88–94
  • Reading Codes
  • 95–99
  • Using Consult
  • Nissan UD Diesel ID-TICS System
  • MID-TICS System
• Clearing Codes
  • 88-94
  • MID-TICS System
• Codes by Year
• Codes by Model
• Questions & Answers

NOTE: 96 & later are OBD2 systems and require a scanner. For an OBD2 code list, please see our Nissan code list or the appropriate generic list.

Nissan: Accessing Diagnostic Trouble Codes

Using (MIL) 88–94

1. Turn ignition On.
2. On all models except Pathfinder, Pickup and Van, proceed as follows:
   1. Turn diagnostic mode selector on ECU fully clockwise and wait until inspection lamps flash. Number of flashes displayed indicates corresponding mode.
   2. Note number of flashes, then immediately turn diagnostic mode selector fully counterclockwise.
3. On Pathfinder, Pickup and Van models, proceed as follows:
   1. Turn diagnostic mode selector on ECU to On position and wait until inspection lamps flash.
   2. Note number of flashes, then immediately turn diagnostic mode selector to Off position.
4. On all models, when ignition is turned Off during diagnosis, in each mode, and then turned back On again after power to the ECU has dropped off completely, diagnosis will automatically return to Mode I.
5. For description of modes, proceed as follows:
   1. Mode I (Mixture ratio feedback control monitor A): during a closed loop condition, the green inspection lamp turns on when lean condition is present and goes off when a rich condition is present. During an open loop condition, the green inspection lamp stays off.
   2. Mode II (Mixture ratio feedback control monitor B): during a closed loop condition, the red inspection lamp turns on and off simultaneously with the green inspection lamp when mixture ratio is controlled within a predetermined value. During an open loop condition, the red inspection lamp stays off. The green inspection lamp function is the same as in Mode I.
   3. Mode III (Self diagnosis): in this mode the DTC is indicated by both the red and green inspection lamp. The red inspection lamp corresponds to units of 10; the green inspection lamp corresponds to units of one.
   4. Mode IV (Switches on/off diagnosis): during this mode, the inspection lamps monitor switch on/off condition of the throttle valve switch, starter switch and vehicle speed sensor.
   5. Mode V (Real time diagnosis): if a malfunction is present during a driving test, the inspection lamps will display the malfunction condition immediately.

Reading Codes

The Electronic Control Unit (ECU) monitors several engine sensors and actuators. If a problem occurs the information is stored in the ECU’s memory for retrieval. The codes are displayed by the red diode on the ECU. The codes are interpreted by the number of times and duration the diode flashes. The red diode will flash for 0.6 of a second with 0.6 of a second delay between flashes “X” number of times, this will represent units of ten. Then there will be a delay 0.9 of a second and the red diode will flash for 0.3 of a second with 0.3 of a second delay between flashes “X” number of times, this will represent units of one. There will be a delay of 2.1 seconds between codes.

For example, if the red diode flashes once and then flashes twice rapidly this should be interpreted as code 12. The codes are displayed in numerical order starting with the lowest and ending with the highest.

95–99

1. Turn ignition On.
2. Turn diagnostic mode selector on ECU fully clockwise and wait until inspection lamps flash. Number of flashes displayed indicates corresponding mode.
3. Note number of flashes, then immediately turn diagnostic mode selector fully counterclockwise.
4. If ignition is turned Off during diagnosis, in each mode, and then turned back on again after power to the ECU has dropped off completely, diagnosis will automatically return to Mode I.
5. For description of modes, proceed as follows:
   1. (Mode I): with engine stopped, system in bulb check state. with engine running, system in malfunction warning state.
   2. (Mode II): with engine stopped, system in self diagnostic results state. with engine running, system in front O2S monitor state.

Using Consult

1. Turn ignition Off.
2. Connect ‘‘Consult’’ the data link connector (DLC), located behind fuse box cover.
3. Turn ignition On.
4. Touch ‘‘Start.’’
5. Touch ‘‘Engine.’’
6. Perform each diagnostic test mode according to each service procedure.

Using Generic Scan Tool

1. Turn ignition Off.
2. Connect scan tool’ to its 16-pin DLC, located at lower edge of instrument panel near steering column.
3. Turn ignition On.
4. Enter program according to screen instructions or in operation manual.
5. Perform each diagnostic test mode according to each service procedure.

Nissan UD Diesel (ID-TICS System)

1. Place diagnostic switch in the Off position.
2. Carry out diagnosis under the following three conditions:
   1. Place ignition switch in the On position.
   2. Crank engine.
   3. Start and operate engine.
3. The trouble codes will be displayed by the flashing Engine Control Lamp and the Overheat Warning Lamp and the Overheat Warning Buzzer.

MID-TICS System

The diagnostic trouble codes will be displayed by the check engine lamp. For example, a code 12 will be displayed by the check engine lamp flashing 1 time for approximately 1.2 seconds, followed by a .6 second pause, then 2 short flashes. Each trouble code will be displayed 3 times before the next trouble code is displayed.

Nissan: Clearing Trouble Codes

1. On pre-95 models, MIL stored memory will be erased after selecting Mode III or Mode IV.
2. On 95–99 models, MIL stored memory will be erased by switching from Mode II to Mode I.
3. On all models, MIL stored memory will be erased if battery terminal is disconnected.
4. On 95–97 models, to erase DTCs using Consult, select ERASE in the SELF DIAG RESULTS mode.
5. On 98–99 models, to erase DTCs using Consult, turn Consult On, select A/T, SELF DIAG RESULTS and ERASE. Select BACK, ENGINE, SELF DIAG RESULTS and ERASE.
6. On all models, to erase DTCs using generic scan tool (GST), select mode 4.

88-94

1. Turn the ignition key on.
2. Turn the diagnostic mode selector on the ECU fully clockwise and wait more than two seconds then turn the selector fully counterclockwise. The ECCS system is now in mode 2.
3. Turn the diagnostic mode selector on the ECU fully clockwise and wait more than two seconds then turn the selector fully counterclockwise. The ECCS system is now in mode 1. ECU memory is now erased.

MID-TICS System

1. Release diagnostic switch.
2. Place ignition switch in On position.
3. Check that Overheat Warning Lamp is displaying Diagnostic Display Code.
4. Connect memory clear connector 2400400Z09, or a suitable jumper wire to reset switch terminals. The reset switch is located behind the electrical unit board.
5. Check that Overheat Warning Lamp and Buzzer display shows Diagnostic Display Code 0–1. The System memory will be cleared in approximately 10 seconds.
6. Remove connector or jumper wire from reset switch electrical connector.
7. Connect electrical connector to reset switch.
8. Place ignition switch in Off position.
9. Place ignition switch in On position, then check Overheat Warning Lamp and Buzzer. Diagnostic Display Code 0–1 should be indicated.

Nissan: Diagnostic Trouble Codes by Year

Nissan: Diagnostic Trouble Codes by Model