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Discussion Starter · #1 ·
Happy holidays,

It been a while since I posted here. Anyway, on a 2008, manual trans, I have a Cruise Ctrl issue that is worst when the engine/manual trans is cold. I select cruise and when cold the cruise will self cancel very quickly. It becomes more reliable after all the mechanicals are warm. Regardless of temp I can duplicate the self cancelling problem by applying pressure to the shift knob to the right side/driver right. I can retain cruise mode while holding the shift knob against it's left stop even when cold. This is repeatable in all gears. So it seems the problem is worst when cold and naturally caused by road vibrations. When warm the system is less susceptible to road vibrations to the point of being totally reliable until I push the gear lever to the right. Hand pressure on the gear lever fore and aft will NOT cancel the cruise unless I push so hard as to knock it out of gear mesh into neutral.

What is the shift knob/lever design or interaction with cruise? Is there a switch to adjust? I am the second owner and was told the clutch was replaced once, so the trans has been removed at least that many times.
 

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That's a new one for me. I can think of nothing related to the shift lever that has anything to do with the Cruise. On a manual, the cruise can be disengaged by hitting the brakes, pushing in the clutch, sticking the transmission in neutral or turning off the cruise with the steering wheel controls.

All of this goulash is controlled through the ECM. The Brake, Stop Lamp, Clutch, Wheel Sensor all route signals through the ECM when the cruise is engaged. There is also a Park/Neutral position switch that tells the ECM what gear position the truck is in so it will allow the cruise to work. It sounds to me like the PNP Switch might be bad or damaged. Looking at the diagram (Page 65 of the Service Manual in the Transmission/Transaxle Chapter) it is the TOP plug assembly above the Back Up Lamp switch on the Passenger Side in front of the Shift Lever.

That's my best guess. Hope that helps.
 

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Discussion Starter · #3 ·
That's a new one for me. I can think of nothing related to the shift lever that has anything to do with the Cruise. On a manual, the cruise can be disengaged by hitting the brakes, pushing in the clutch, sticking the transmission in neutral or turning off the cruise with the steering wheel controls.

All of this goulash is controlled through the ECM. The Brake, Stop Lamp, Clutch, Wheel Sensor all route signals through the ECM when the cruise is engaged. There is also a Park/Neutral position switch that tells the ECM what gear position the truck is in so it will allow the cruise to work. It sounds to me like the PNP Switch might be bad or damaged. Looking at the diagram (Page 65 of the Service Manual in the Transmission/Transaxle Chapter) it is the TOP plug assembly above the Back Up Lamp switch on the Passenger Side in front of the Shift Lever.

That's my best guess. Hope that helps.
Just a follow up to my C/C issue. The dealer diagnosed it as the Neutral Position switch (PNP) on the trans, which they didn't stock. I did some forum searching here and found quite a few similar posts as mine but few of them suggest looking into this switch which I thought is worth noting here today.

I think I will get under the truck see about unplugging it, checking for dirt/corrosion, general condition kind of stuff, clean it and plug it back in and see if it brings it back to functionality.

One of my searches mentioned the plug is pretty cheap as a dealer item so that's good to know. I didn't see any options on Rock Auto. Are there any other online stores to check for Nissan electrical parts?
 

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