Code 63 - TP sensor below minimum voltage

fatherdoug · Jul 22, 2010

'89 F-250 460 engine. I get the check engine light on a regular basis, which comes and goes. Using the check engine light as the indicator for getting the code( 6 flashes, then 3 flashes), this is the only code that comes up.

Would there be anything else causing this code other than the TP sensor. I did check the voltage of the wiring going to the TP with KOEO mode, I get about 4.8 volts, but it is not constant. The voltage seems to jump around a lot.

Any other suggestions. I bought a motorcraft TP sensor from rock auto, but I want to make sure I am not missing anything.

flareside_thunder · Jul 22, 2010

Which TP wires did you probe? When you test it voltage should not be above .99v or below .96v KOEO Here's an excellent write-up from another forum...it wasdone on a single blade TB but the same steps apply for twin blade TB's. http://www.f150online.com/forums/li...ur-tps-voltage-single-bore-throttle-body.html

fatherdoug · Jul 22, 2010

Thanks Junior. I was only checking the voltage of the plug after it was disconnected from the TP sensor with KOEO. I was getting 5 volts from the top to bottom connector. Excellent article.

smokey · Jul 22, 2010

When you test the TPS you can OHM them out when unhooked to check for bad spots in the TPS itself. A analog meter works better than a digital for this. The number or needle sweep should be smooth with no jumps when opening or closing the throttle plate.

fatherdoug · Jul 22, 2010

Don't have an analog ohm meter. But when you do it, which two blades do I use?

fatherdoug · Jul 22, 2010

Using Junior's reference article(Thanks again), the voltage at the TP sensor was 0.87 volts. I was only able to adjust the voltage up to 0.95 volts, which is better but probably still on the low side. I'll drive it later to see if the adjustment helped.

fatherdoug · Jul 22, 2010

A little test drive done and no check engine light. I'll replace the TP sensor when the new one comes in and recheck the voltage. Problem solved for now.

Thanks Junior and Smokey.

flareside_thunder · Jul 22, 2010

No problem...maybe I can steal it and have it posted as a Tech article......It is pretty handy fer sure.

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Code 63 - TP sensor below minimum voltage

fatherdoug

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flareside_thunder

Florida Chapter member

fatherdoug

Tonto Papadapolous

smokey

Hitech hillbilly

fatherdoug

Tonto Papadapolous

fatherdoug

Tonto Papadapolous

fatherdoug

Tonto Papadapolous

flareside_thunder

Florida Chapter member

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