1998 XJ Sport 4.0 AW4
P0700 and P0705

Came on randomly, was in drive but it would act exactly like I had it in 3rd. Checked the codes and got the above(and a couple cylinder misfire codes...). Cleared it and drove home. Didn't come back...

A little Googling and the main thing seems to be the NSS. But no trouble starting in park. Reverse lights work. Tranny fluid is topped off.

Basically my question is whether this is serious or not and what do I do to prevent this code in the future? Remove, clean, install NSS? Go over all the grounds? That's my current plan... Anything else though?

 

Ummm anyone have some thoughts?

 

The P0705 may get worse over time and the fact that you state that it acts like it's in 3rd it may give you overdrive issues. The diagnostics manual gives a long list of possible causes for P0705 so I think you should do some testing.


Below is the TCM pin out and test procedures. Read both carefully before testing.


You'll need a digital manual ranging Volt/Ohmmeter. In your case I recommend doing the voltage checks of the TRS (NSS) gear selections. You should also use a safety pin to probe the TCM connector pin cavities.


You'll need to run the gear selector through the gears while taking voltage readings so set your parking brake.


Access the TCM by removing the trim panel and knee blocker from under the steering wheel. The TCM can be seen to the right of the steering column.


This is what it looks like:





Pin out:





Test procedures:



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You can always do the rest of the checks, especially the resistance checks if you want.


Intermittent problems can be hard to pin down. If your readings are all within spec, wiggle the wire harness near the connectors by the transmission dip stick to verify nothing changes.



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Here's what the inside of your TRS (NSS) looks like. It shows the various gear selection contacts. Contact 3 bus bar is power in. The numbers shown relate to the pin numbers in the TRS/NSS connector pin out.






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