Pajero ECU Fault Code Check

In this article we are taking a look at how to extract ecu fault codes for the Mitsubishi Pajero V6. This information covers the NF, NG, NH and NJ models.

To extract the codes on the Pajero you will need either a analogue volt meter or LED test light. The volt meter or test light needs to be connected between the A and C terminals of the Diagnosis Connector and the codes will be displayed as a series of needle movements on a voltmeter or flashes on a test light. The location and terminal arrangement of this connector varies between the different models, please refer to the pictures below.

pajero diagnosis connector
Location of the Diagnosis Connector NG models.
pajero diagnosis connector
Location of the Diagnosis Connector NH models.
pajero diagnosis connector
Typical location of the Diagnosis Connector NJ models.

We don’t have an image for the NF model but from the information we have here it is taped to the wiring loom behind the glove box.

Once you have located the Diagnosis Connector in your particular vehicle connect an analogue voltmeter or LED test light between terminals A and C (see above pics for terminal location). If your voltmeter or test light doesn’t have a probe on both ends a split pin makes a good extension that you insert into the terminal and clip onto.

With the voltmeter/test light in place you can now switch the ignition to ON and start to read the code/s. Each code will display as a series of pulses separated by a pause.

The first series will be long pulses and they represent tens. The second series will be short pulses and they represent the units. For example, three long pulses followed by a pause, followed by one short pulse indicates code 31.

If there has been more than one code stored in the ecu memory each code will be displayed in sequence. Also, if the voltmeter or test light displays a constant voltage without pulsing the ecu should be renewed.

If there are no fault codes recorded in the ecu memory short pulses will be displayed continuously.

What the Fault Codes mean.

This list will give you a basic idea of where any faults lie, however for the majority of the components listed there is further tests that should be done before replacing it.

  • Code 11 – Oxygen Sensor (NJ and NH models)
  • Code 12 – Air Flow Sensor
  • Code 13 – Intake Air Temperature Sensor
  • Code 14 – Throttle Position Sensor
  • Code 21 – Coolant Temperature Sensor
  • Code 22 – Crank Angle Sensor
  • Code 23 – TDC (top dead centre) Sensor
  • Code 24 – Vehicle Speed Sensor
  • Code 25 – Atmospheric Pressure Sensor
  • Code 36 – Ignition Timing Signal (NH and NJ models)
  • Code 41 – Injectors
  • Code 42 – Fuel Pump (NF and NG models)  

14 thoughts on “Pajero ECU Fault Code Check

  1. Mate I reckon this is very helpful of you. I am trying to locate the connection site for my 1994 Mitsubishi Pajero. I can see where the 16 pin plug goes but could not locate where the white plug can go. Help please.


  2. Hi Jude,
    I’m not sure I understand your question. Once you have located the diagnostic plug it is a matter of using an anologue voltmeter or led test light to check for any fault codes. Does that make sense to you?


  3. have nj has spark, fuel and good presure . use led test light too bridge A and C terminal engine light flashes with multiple codes but seems very eratic in code sequences . if i disconect battery for 10 min reconect it go to crank engine over it fires for split second then nothing until i disconect battery and repeat . have tested resistance in ignition leads replaced rotor button and spark plugs . initial car was going walked in to shop came out then car not fire to start been like it ever since.
    would you have idea as to proble . thank you

  4. Great site and very useful, just a couple of question though,
    1. Can you explain ‘when’ then codes relate too? ie do the codes relate to,
    the last time the car was actually running,
    since the last ECU reset, or
    other period?
    2. How do the ECU codes get cleared or how do I clear the ECU codes from its memory?
    fix the faults and the codes will just disappear the next time the car is running,
    disconnect the battery, or
    other reset method?

  5. Micheal, the ECU memory is reset when you disconnect the battery, so the codes are from when the battery was last disconnected! hope this helps.

  6. Thanks Paul, have reset the unit and taken it for a run. All codes that were there have now been cleared so all looks good.

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  8. Thanks for the help but now it would seem as though my ecu is. In need of replacement! Typical 🙁 but thanks 😉

  9. Hi
    My NG pajero has a code 15
    fault how do I reset it when I
    First checked it it had a code 14 I checked the throttle control sender it was OK so
    I checked the computer
    And it then had a code 15
    Can I reset the computer
    And howm

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