We have an NP Pajero 3.2l Diesel manual. We cannot engage 4WD, indicator light comes on when 4WD engaged, but when pressure is put on gearbox, the yellow light flashes in the middle and doesn't seem to be engaging. Any ideas or diagrams to show the problem?
Country: AustraliaMake: MitsubishiModel: NP PajeroYear: 2003Engine: 3.2lt Diesel
Don't know what to look for. Been told about solenoid and hoses connecting.
Hi,The free wheel solenoid and hoses is a possibility, however you would normally experience partial engagement problems long before your C/D light began flashing. Of course if the solenoid has been failed for a long time but you haven't had need to use the 4WD system, this is likely to have gone unnoticed until it got this bad.The C/D light not only shows you when your axles are locked, but it also functions as a "Check Engine" light of sorts for the 4WD system. Because the light is continuing to flash, we know a malfunction is being identified by the 4WD ecu.So in order to get a repair plan in place, you are going to need to determine what codes are being set in the ecu so that the reported components can be checked, repaired, or replaced as necessary.The system can be scanned by a MUTII or MUTIII scan tool (Mitsubishi factory scan tools). However, there is a built in self diagnosis available on most 2001-2003 models. To use it, you simply need to ground pin 1 of the OBD connector under the dash and the C/D light will flash the codes out to you. Also be aware that many generic scan tools will ground pin 1 when plugged in, so if you have a generic scan tool or code reader, you can try plugging it in and turning the key on and see if the C/D light begins flashing in sequence.When pin 1 is grounded, the C/D light will flash the code in the following format: Long flashes for tens digits followed by short flashes for ones digits of the code. So for example if you had a code 12 and a code 23, it would flash one long flash followed by two short flashes (12) and then two long flashes followed by three short flashes (23). It will read all codes out then repeat indefinitely.Once you have the code numbers you will have a better footing on what is going on and how to correct it. I am attaching a list of the possible codes to be able to see what sensor/switch is in question by code number.If you have any questions, please let me know.
Where exactly is the OBD connector located under the dash and what does it look like? Unfortunately we are in a very remote location and do not have a manual and need to get this 4WD working properly.
No problem.The OBD connector will be under the driver side of the dash, nearer the center console area.I only have a left hand drive illustration available, but if you have right hand drive it will be nearly a mirror image of this. The pin #s of the connector are identified as well so you can see which pin to ground.
Thanks for the big help Doug
We have got rid of all the problem codes except for #25. Is there any way we can check and isolate exactly what the problem is with that? Is there a fuse in that circuit? Is there a way to bypass the speed sensor circuit? Which sensor is it, i.e. where is it located - rear of transfer case? which side?
From Fenn and Darren in the Strezlecki Desert in Outback Oz.
Hi Fenn and Darren.Forgive the delay, as you caught me between shifts.Glad to hear things are getting resolved. With relation to code #25, this is most common to be the sensor itself failing, however you will sometimes find that the sensor is soaked in oil if the seal on it fails, allowing transmission oil to get to the electrical portion of the connector (this is especially true on #2 as opposed to #24... #25 is a short circuit on the sensor/sensor circuit). Inspect the wiring for any issues first, and of course the sensor for fluid escaping. If nothing unusual is found, ideally we would want to check the signal with an oscilloscope to see what is going on there, however in all likelihood the sensor is just bad... it is not too uncommon.The speed sensor is located on the tail housing just before the propeller shaft goes in. I do not have a good picture of this unfortunately, and our market did not receive manual transmissions, however on our auto boxes the sensor is near the top of the tail housing, pointing up and a bit to the right. On some years the tail housing was shared between auto and manual boxes, so it is likely the same, however it is not a sure thing. It will be several hours before I will be able to access my international database to verify, but it should not be that big of a deal... just look at the tail housing, it will be located on it, and it will be the absolute rear most sensor before the propeller shaft.
Hi again Doug and thanks for your help
We have located 2 sensors on the propeller shaft. the 1 on the right has a 3 pin plug and the 1 on the left has a 2 pin plug. Which is which? Neither show signs of leakage or damage. Your thoughts...............?
Hi,It's no problem.The rear propeller shaft speed sensor will be a 3 wire sensor. Again because the system is throwing a code 25, it is indicating an electrical malfunction, most likely a short on the tail shaft speed sensor. If you have a meter and oscilloscope you can check it's function.Pin 3 should have 12V with the key on. If it does not, you will want to check the wiring for damage and verify your fuses.Pin 1 should have continuity with ground (less than 2ohms).Pin 2 should have 5V with the key on and 5V on/off with the rear propeller rotating. If you have an oscilloscope you should see a 5V square wave on this wire. If you do not have 5V at any time, you will want to check your wiring for damage (both pin 2 and pin 1, the source to ground in the ecu) and if none is found, the transfer (4WD) ecu will be suspected faulty. If you have 5V but it does not pulse (square wave), you will suspect the sensor is at fault or the reluctor wheel on the tail housing yoke shaft is damaged (not likely).Doug C41033.1293586458
Mitsubishi employed and Factory trained ASE certified technician