Throttle body problem
02-10-2004, 10:26 AM
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AHA!
PO122 = low TPS reference signal. That means your TPS isn't getting a full signal and thus couldn't give your ECU a proper output signal.
Your TPS voltage of 0.08v is way too low - I'm assuming that's KOEO? Also, your idle TPS voltage of 0.27v is a little low, but not that bad. Your WOT TPS voltage is a little high, though. It's a 5v reference but you hardly, if ever, output full signal strength.
Anyway, it seems your problem is the TPS itself, so that will need to be replaced. In the mean time, it's most certainly driveable, you just may have a rough idle. Also, your air/fuel will be a little lean but not enough to warrant your car be garaged and not driven.
Here's something you can do: Go check on the car, the wiring to the TPS. Make sure there's no breaks in the insulation from wear/tear or burning. It also wouldn't hurt to check for a voltage drop at either end of the wire for source voltage (backprobe one lead of a voltmeter into the TPS harness, and the other lead into whatever harness the wire leads into). The reading should be very, very low, indicating no voltage drop. Considering its passing a 5v signal, you should have a 0.050v voltage drop at most.
If there is a high voltage drop, that means you have high resistance in the wire itself, and that's MUCH cheaper to replace than a TB assembly.
You can repeat the procedure on any related wiring, to try to find a wiring problem. That may very well be the source of the problem, not the actually TPS itself.
Good luck.
PM me if any of this is confusing; I'm in a hurry and just threw it together real quick.
PO122 = low TPS reference signal. That means your TPS isn't getting a full signal and thus couldn't give your ECU a proper output signal.
Your TPS voltage of 0.08v is way too low - I'm assuming that's KOEO? Also, your idle TPS voltage of 0.27v is a little low, but not that bad. Your WOT TPS voltage is a little high, though. It's a 5v reference but you hardly, if ever, output full signal strength.
Anyway, it seems your problem is the TPS itself, so that will need to be replaced. In the mean time, it's most certainly driveable, you just may have a rough idle. Also, your air/fuel will be a little lean but not enough to warrant your car be garaged and not driven.
Here's something you can do: Go check on the car, the wiring to the TPS. Make sure there's no breaks in the insulation from wear/tear or burning. It also wouldn't hurt to check for a voltage drop at either end of the wire for source voltage (backprobe one lead of a voltmeter into the TPS harness, and the other lead into whatever harness the wire leads into). The reading should be very, very low, indicating no voltage drop. Considering its passing a 5v signal, you should have a 0.050v voltage drop at most.
If there is a high voltage drop, that means you have high resistance in the wire itself, and that's MUCH cheaper to replace than a TB assembly.
You can repeat the procedure on any related wiring, to try to find a wiring problem. That may very well be the source of the problem, not the actually TPS itself.
Good luck.
PM me if any of this is confusing; I'm in a hurry and just threw it together real quick.
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