4wd engaging in 2wd !!??

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nismopath
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4wd engaging in 2wd !!??

Postby nismopath » Mon Sep 23, 2019 6:19 am

Lately as I have been riding on the highway, my 4wd warning light will come on and my square display that is inside the tach goes blank. I have the knob set to 2wd.
Any ideas on what’s going on ??


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disallow
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Postby disallow » Mon Sep 23, 2019 7:13 am

I would check for any ABS codes. Sounds like a loose wire or connection.

nismopath
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Postby nismopath » Mon Sep 23, 2019 10:15 am

Thanks. How would I find that out? There is no check engine light going off.

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disallow
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Postby disallow » Mon Sep 23, 2019 12:15 pm

ABS light on?

nismopath
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Postby nismopath » Mon Sep 23, 2019 12:22 pm

No it is not on.
The is issue happens sporadically though, on a 20 minute drive it may come on 2-3times max. Each time for 30seconds and then turn back to normal.

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smj999smj
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Postby smj999smj » Mon Sep 23, 2019 7:33 pm

There's a transfer case self-diagnostic procedure that can be performed to get the self-diagnostic codes via the 4WD light flashes in the case you don't have a scan tool that can read the codes. It's listed in the factory service manual. NICO Club's site has free access to their Nissan FSM's.

nismopath
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Postby nismopath » Sat Sep 28, 2019 12:56 pm

Can I just go to autozone or one or those places to scan the code ? Or do you mean there is something else I should do?

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smj999smj
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Postby smj999smj » Sat Sep 28, 2019 4:53 pm

nismopath wrote:Can I just go to autozone or one or those places to scan the code ? Or do you mean there is something else I should do?
Parts stores usually use a generic code reader that just read "P-codes." To get codes for the transfer case, you need to have a capable scan tool or do the self-diagnostic procedure listed in the FSM.

nismopath
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Postby nismopath » Sun Sep 29, 2019 12:33 pm

Ok great. Now what is a FSM ?

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smj999smj
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Postby smj999smj » Sun Sep 29, 2019 4:06 pm

"Factory Service Manual":

https://www.nicoclub.com/nissan-service-manuals

BTW, do you have the standard transfer case or the AUTO mode transfer case?

nismopath
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Postby nismopath » Mon Sep 30, 2019 8:09 am

Oh ok. Thanks
Mine has 2wd, auto, 4hi and 4lo

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smj999smj
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Postby smj999smj » Mon Sep 30, 2019 8:36 pm

So you must have an "LE" model with the AUTO mode transfer case. A problem that sometimes occurs is that there develops a poor contact between the harness connector terminal and the pin of the transfer relay, which controls the electric transfer pump. The AUTO mode transfer case has a wet clutch and uses both a mechanical pump and an electric fluid pump. When in AUTO, the electric pump operates at speeds below 35 MPH, at idle and also when in reverse; other than those conditions, the electric pump will not run.
The transfer relay, which, FYI, is the same P/N as the relay for the air suspension in the Armada, is located in the engine compartment, not far from the brake master cylinder, and is on a small bracket that attaches to the side of the engine compartment with a single, 10MM head (6Mx1.0) bolt. It will have two harness connectors plugged in to the single relay. In many cases, you can unplug the relay, clean up the pins on the relay with a small file, tighten up the terminal in the harness connector with a pin so it will apply more tension, and put it back together and erase the codes for the fix. In my case, it worked for about a year and the problem re-occurred due to corrosion on the relay pin, so I ended up having to replace the transfer relay, which was about $35 and is part # 25237-EA000.
If this is your problem, when you check for codes in the transfer case, you will get line pressure codes.

nismopath
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Postby nismopath » Wed Feb 12, 2020 7:42 am

What section would it be under in the service manual ? I found a couple diagnostics while searching but I don't think I found the right one. Is there an acronym that they use or what would it normally say ?

nismopath
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Postby nismopath » Wed Feb 19, 2020 9:29 am

I installed the new one and same thing happened. I haven’t driven it around the block yet so it may go off, but just curious if I need to reset the ECU or do anything after installing the new relay? Or should it have just gone away?

nismopath
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Postby nismopath » Thu Mar 12, 2020 1:41 pm

is this the right self-diagnostic ? I tried twice and nothing happened. I got it from another site when I googled


1. Warm up engine.
2. Turn ignition switch “ON†and “OFF†at least twice, and then turn ignition switch “OFFâ€.
3. Move A/T selector lever to “P†position.
4. Turn 4WD shift switch to “2WD†position.
5. Turn ignition switch “ONâ€. (Do not start engine.)
6. 4WD warning lamp should turn ON.
If 4WD warning lamp does not turn ON, refer to DLN-72, "Diagnosis Procedure".
7. Move A/T selector lever to “R†position.
8. Turn 4WD shift switch to “2WDâ€, “4H†and “2WD†in order.
9. Move A/T selector lever to “P†position.
10. Turn 4WD shift switch to “4Hâ€, “2WD†and “4H†in order.
11. Move A/T selector lever to “N†position.
12. Turn 4WD shift switch to “2WD†position.
13. Move A/T selector lever to “P†position.
14. Read the flickering of 4WD warning lamp.


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