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TPS saga
Last post on Jun 30, 2012 at 10:53 PM
You are in the Nissan Quest Forum.- Your Host is kcram
What is this discussion about? Nissan Quest, Mercury Villager, Van
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#1 of 1 TPS saga by hpb
Jun 30, 2012 (10:53 pm)
I know that this is a common problem on villagers/quests, but here goes anyway. I have a 1997 villager. I don't know what info might help diagnose the problem, so I will start from the beginning. I know all of the repair history because the father-in-law bought it new and gave it to my wife when he no longer had kids in the house.Around 2005 timing belt broke... replaced it myself.
Let's say 2006, fuel pump... relaced it myself. Somewhere around the same time, a new TPS.
2012 (days after saying how reliable it has been and how little we have had to do to it, and it just hit 300,000 miles) Driving to work w/ cruise control on and it died. Sat there waiting for parts stores to open. Got the fuel line off at the fuel filter and cycled the key on and off.. maybe a thimble of fuel coming into cup. Replaced fuel pump and it started right up. Got about 10 miles down the road and it started surging.. and check engine light came on. Put it on a tester and it came up w/ a code that had something to do with third gear wrong ratio or something like that. The guy said that code is usually the TPS. It drove ok from then on, but once you are up around 50 it will kick into OD ( or downshift or whatever) and the rpm's jump to 3000+ . If you get used to it, you can usually go a little higher than you want to go and then let off the pedal a little and it will downshift and the rpm will drop to 2000-2500.
Waited for payday and got the new TPS. Attempted to adjust it, but when I got to the part in the repair manual about backprobing the wires and getting .4 to .5 volts I got 0.0 and an occasional 0.1 (could be just a fluctuation in the tester though). I get the correct voltage on the plug before installing, but not once the plug is plugged in.
So, CEL is still on. When I tested it last time at the parts store, I got p0120, tp sensor a circuit malfunction. I am not sure where to go from here. I don't see any broken wires, no crimps in the wiring. I took the MAF sensor off and it looks ok. Not corroded or anything. I would crawl under the dash and remove the PCM, but it sounds like a pain and the book doesn't have any test procedure listed. They aren't cheap, so I cant just go pick one up and replace it to see if it fixes the problem. Any ideas?
I doubt it is related since it happened after this, but I went to lunch one day and the temp gauge shot up within minutes of driving. Apparently the water pump went bad. So I got the pleasure of replacing the water pump in the parking lot at work. I went ahead and replaced the timing belt, thermostat, and all drive belts while I was at it. Made for a lovely evening.
Anyway, I drive it daily because I have no choice. The mileage is probably down to 15 mpg or somewhere around there now (down from around 21 before this happened). The next thing I am going to do is change the transmission filter and fluid. I have no idea if it has EVER been changed. I know I haven't. Was pointing that out to the wife... "hmmm, should be done every 30,000 miles. I guess I should have done it 10 times by now."
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