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bigcman
Dodge Dakota
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5/02/2006
21:10:04
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 Subject: TPS 2002 Dakota
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Message:
Ok, I need help. My dakota; 2002, 4.7, 4x4, has stated to surge going down the road in cruise. Like at 2,000 rpm's, it'll surge up about 250 rpms then go back down, then it'll do the same thing over and over. And...when i bought this truck, I'd get about 280 miles on 3/4 of a tank, now im lucky if i get 200 miles after using 3/4 of a tank.
So...i have been reading about TPS's. I tested mine. I grounded one end of the tester on the negative terminal on the battery, and backprobed the middle wire (orange/blue) on the sensor plug with the key on. At an idle it only put out .3 Volts, wide open 1.55 volts. It's supposed to be .5-1 at idle and 4-5v wide open. Did I test it correctly? Now the voltage increased gradually as I opened up the throttle, it didn't jump around.
Next, how do i replace it? It looks like I would just take the old one off and put a new one on. Is there an adjustment somewhere?
I appreciate any help since I have to do it myself. I cant' afford the price of a new sensor and the price of a garage installing it.
Thanks
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modain
GenIII
5/02/2006
21:29:05
|  RE: TPS 2002 Dakota
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Message:
Although I have never had an issue with any of my TPSs what you describe has been what other bad TPS sufferers have documented.
You tested it correctly. But the idle reading appears way too low for proper operation - so this could be an obvious tip-off to someone acutely knowledgable about their specs.
The RPM jump you describe is right in line with a bad TPS. Replace it. Disconnect the wire loom, take out the two Torx-25 screws and it'll slip right off (may have to coax it). Put the new one on in reverse of this procedure.
There is no adjustment. But make sure you get the TPS situated the same way on the shaft as the old one was located. Observe the slots as you pull it off.
What's your left foot doing?
=========================================
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open
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mccamp
Dodge Dakota
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5/03/2006
08:42:53
| RE: TPS 2002 Dakota
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Message:
I replaced mine this last weekend. Cost me $31 and literally took 5 minutes to take off and replace with a new one. If it isnt lined up, I dont think it will slip on until it is, so you shouldnt have to worry about that. I also would recommend disconnecting the battery ground first. That way it will reset itself immediately upon first start up.
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jpkomm
Dodge Dakota
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5/03/2006
10:51:58
| RE: TPS 2002 Dakota
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Also remember after you hook up the battery again and crank it, let it idle for a few minutes to learn the new idle point. Not doing so can cause some issues down the road. Good luck. :)
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bigcman
Dodge Dakota
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5/04/2006
23:19:51
| RE: TPS 2002 Dakota
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Message:
Ok, I replaced the TPS. The new one reads .35 now at an idle, and it's still way lower than the 4 to 5 volts at wide open range.
Is the middle wire the correct one to probe? Something is wrong I think.
My surging problem is long gone, but I'd feel better if I had the correct voltage readings.
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N56629
Dodge Dakota
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5/06/2006
08:57:37
| RE: TPS 2002 Dakota
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Message:
The computer calibrates itself using information from the tps. It doesn't really care if the reading is .3 or 1.0 at idle. It just wants to establish a starting point. The manual gives a range of .35-.90v as an acceptable reading with the throttle fully closed.
Surging problems are more likely to be caused by the Idle Air Control valve (IAC). Erratic idle can be caused by either the tps or voltage supplied to the tps. Check the sensor by back probing the connector, opening and closing it make sure it always returns to the same reading. Remove the connector and check the voltage being supplied to the sensor. Wiggle all the wiring to see if you get a constant voltage reading of 5v.
Performance doesn't depend on what your base voltage reading is from the tps and I've generally found tps mods to be a waste of time. Voltage at WOT can be a different story although the computer tends to learn your WOT voltage too.
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bigcman
Dodge Dakota
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5/06/2006
10:15:45
| RE: TPS 2002 Dakota
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Message:
well the surging problems were fixed with the new TPS. Also i used to have a huge throttle increase when i set the cruise control, now it's really smooth.
I was just concerned with the voltage to the sensor. I never really had a definate voltage to judge by.
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N56629
Dodge Dakota
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5/06/2006
10:25:10
| RE: TPS 2002 Dakota
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Check the voltage TO the sensor. Voltage with the sensor connected will always be less than the voltage supplied by the PCM.
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shatto
Dodge Dakota
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5/06/2006
11:30:10
| RE: TPS 2002 Dakota
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Message:
oh no i am afraid i may have messed up my truck by not letting it idle for the amount of time that you said i should have let it run does anyone know what type of problems this can cause
i have a 2004 4wd 5-speed Dakota with the 4.7 6cyl
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N56629
Dodge Dakota
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5/06/2006
21:19:51
| RE: TPS 2002 Dakota
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Message:
If you are not having any problems with the idle then don't worry about it. I've swapped many tb's and tps's and have never had to let it idle more than to let it stablize.
If you have problems try reseting the PCM and start over.
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