PNP woes

Z06killinsbf · Post by **Z06killinsbf** » 20 Aug 2016, 18:36

Background: 98 v70 T5 was giving me fits with the PNP light show and 3rd gear only issue. So I rebuilt the PNP switch which fixed the safety mode and the car ran great, BUT it was throwing a CEL for a faulty PNP switch.

So this week I ordered a replacement PNP switch (non Volvo), and after installing it the light show has returned and the CEL remains.

I believe I installed it correctly as the reverse light trick works great and almost everything works as it should. So what did I miss? Or is the knockoff switch really that bad? I need to fix this because Texas won't pass state inspection with a check engine light and all the shops I've talked to won't touch it even though it's a non safety item. Any help?

Post by **tryingbe** » 20 Aug 2016, 19:41

What's the actual code?
Did you reset the code?

Post by **bmdubya1198** » 20 Aug 2016, 19:48

Did you align it properly? Seems odd that it would still be throwing a CEL.

Z06killinsbf · Post by **Z06killinsbf** » 20 Aug 2016, 21:19

Code was a P0705 prior to me replacing with a new sensor. I literally just installed the new sensor and all hell broke loose.

I'm not sure I did it correctly, I followed a couple different methods and the one with checking the reverse light actuation is sort of what I stuck to. If that's wrong let me know and I'll adjust.

Post by **bmdubya1198** » 21 Aug 2016, 06:25

I adjusted using the reserve lights and it worked for me.

Post by **MadeInJapan** » 21 Aug 2016, 09:35

bmdubya1198 wrote:I adjusted using the reserve lights and it worked for me.

Same here and used a lead pencil to mark the range on the connector itself. It was much easier than I had thought when I did this job years ago.

Z06killinsbf · Post by **Z06killinsbf** » 21 Aug 2016, 10:15

So I've swapped back and forth between the factory PNP and the aftermarket PNP, absolutely no change. I believe it must be something different, but now the car is stuck in the safety mode and I'm not going to try driving it anywhere.

Z06killinsbf · Post by **Z06killinsbf** » 21 Aug 2016, 10:16

Also, the switch can be removed/installed without Unbolting the cable and losing the adjustment

Z06killinsbf · Post by **Z06killinsbf** » 21 Aug 2016, 11:11

Rotating the body of the PNP makes zero change, I don't see how the pencil trick works, my lights are only on while in reverse and there is no "sweet spot". I've got the shaft as centered as I can in relation to the switch but there is zero affect to what happens if I move it.

Post by **bmdubya1198** » 21 Aug 2016, 12:31

So the tranny is in limp mode... I know this one all too well! Is the up arrow light working? Check any and all connectors nearby the PNP switch. I had a huge issue with that when I bought my V70... took me 4 months to figure out what was wrong (good thing it was a project at that point and didn't need to drive it). It was a large square connector between the fan and the front intake tube that had broken and didn't have a complete connection. Fixed it, up arrow light came back on, switched it out of winter mode, and no more limp mode!