Nissan OBD / OBD2 Codes >> Axxess – Pickup – Pickup/Pathfinder – Pulsar 1.6/1.8L – Sentra 1.6L (1988 – 1995)

General information

• Engine control module (ECM) incorporates self-diagnosis function.
• Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded – California 1988 on.
• ECM operates in backup mode if certain sensors fail, to enable vehicle to be driven to workshop.
• Trouble codes are displayed by the red and green LED’s in the engine control module (ECM), in diagnostic test mode 3, or using a suitable code reader.
• The red LED flashes indicate ‘tens’, followed by the green which indicate ‘units’.

Accessing

Mode selection

• Access engine control module (ECM):

o Sentra/Pulsar – 1.

o Axxess- 2

o Pickup/Pathfinder – 3.

• Switch ignition ON.
• Turn ECM diagnosis mode selector fully clockwise 4 [1] .
• Wait until the LED’s flash [4] [2].
• After LED’s flash required mode number, turn mode selector fully counterclockwise [4] [1].
• For example 3 flashes indicates Mode 3.

NOTE: If the ignition is switched OFF during self-diagnosis, the ECM will return to mode 1 when it is turned ON again.

Mode description

• Mode 1: Mixture ratio feedback – heated oxygen sensor (H02S)/oxygen sensor (02S).
• Mode 2: Mixture ratio feedback – CO adjustment section.
• Mode 3: Code display.
• Mode 4: Tests diagnosis ON/OFF switching.
• Mode 5: Real time diagnosis, codes displayed as they occur.

Mode 3

• Access engine control module (ECM).
• Switch ignition ON. Do NOT start engine.
• Select mode 3.
• Count LED flashes and compare with trouble code table.

Mode 4

• Access engine control module (ECM).
• Switch ignition ON. Do NOT start engine.
• Select mode 4.
• Red LED goes off.
• Crank engine, red LED should come ON.
• Depress accelerator pedal, red LED goes OFF.
• Raise driven wheels of vehicle and drive vehicle, green LED should come ON when speed reaches 12 mph (20 kph).

Mode 5

• Access engine control module (ECM).
• Start engine.
• Select mode 5.
• Test drive vehicle.
• LED’s will flash any codes occurring during test.

Erasing

NOTE: Trouble codes are automatically erased once the starter is operated 50 times after the last trouble code was stored.

Method 1

• Select mode 3.
• Read flash codes.
• Select mode 4.
• Switch ignition OFF.

Method 2

• Ensure ignition switched OFF.
• Disconnect battery ground cable.
• Wait at least 15 seconds.
• Reconnect battery ground cable.
• Repeat checking procedure to ensure no data remains in ECM fault memory.

NOTE: Disconnecting battery ground lead may also erase memory from electronic units such as radio.

Trouble code  identification