need help i have a 95 bronco with a 351 that is depowering when taking off even if you take off easy pulled codes and found 626 and 122 one is for the tranny and the other is for tps any clue where to start

thanks in advance

 

Code 122 - Throttle Position Sensor voltage lower than expected.

This is indicative of one of a small group of potential issues. 1) the TP sensor itself has failed. 2) The connection between the TP sensor and the wiring harness has been compromised (loose or corroded). 3) The wiring between the TP sensor and the EEC-IV computer is damaged.

Initial steps - To verify the condition of the VREF circuit to the TP sensor, disconnect the TPS from the wiring harness and verify that there is approximately +5VDC between the BROWN/WHITE wire (in the harness) and ground (frame of the truck) while the key is ON. If so, proceed to the next step. If not, check the wiring harness for damage to this wire which runs all the way to pin 26 of the computer. Once you have +5VDC at the BROWN/WHITE wire move on.

To verify the condition of the other half of the TP sensor circuit, repeat the KOEO test with a jumper wire between the BROWN/WHITE wire and the GREY/WHITE wires in the harness connector. If Code 53 is generated during the KOEO test replace the TP sensor. If not, with the key ON take a voltage reading between pin 47 of the computer and ground. This reading should also be approximately +5VDC. If not, check and repair the GREY/WHITE wire between the sensor connector and the computer.

Code 626 - E4OD-related fault code that indicates erratic (or low) TP signal to the shift management portion of the EEC-IV computer. See above procedure and clear all codes before running the truck again.

Obviously the above information is a complete procedure for troubleshooting the entire TP sensor circuit. All steps need not be followed if there is an obvious point of failure in the wiring or connector OR Code 53 is generated when the KOEO test is run with the jumper in place. These conditions point to a failed TPS in the case of Code 53 generated or the obvious electrical continuity failure.

 

thanks will try this when i get off work

 

re checked codes with jumper did not getcode 53 i have 5 volts at the conector on gray and brown wire where is the computer and which pin is 47 thanks for all the help

 

Computer is behind the passenger side lower kick panel beneath the dashboard.

 

thanks will look at that today when i get off work

 

could not find computer behind kick panel ended up following thethe wires from the sensor to a black box on drivers side fender well checked gray and white wire had 5 volts must be bad connection some wear will run new wire if it does it again runs great now thanks alot for help

 

So you have 5 volts at the end of the grey/white wire from the TP sensor connector AT the 156-pin connector on the inner fender? Yikes, so that means the problem is further down the line towards the computer or right there at the multi connector. Check the harness where it goes through the firewall for cuts or chaffed insulation. Best of luck. At least you have it narrowed down.

 

is the computer behind kick panel i could not find it there did a google search and seen some one pulling a computer from under driver side front fender right under where i traced the gray wire to i thought that was the plug going in the computer am i right or do i need to trace it some more

 

Not to my knowledge. The EEC-IV computer is mounted behind the plastic kick panel and forward of the shift modulating computer. The EEC-IV computer is aluminum. The shift modulator is plastic.

 

seen a black box but not a sliver box in there but will look again truck is running great thanks again for all the help

 

The attached file is a photo of a computer from a 94 Bronco. The one in your truck should look identical... but still in the truck.

 

found what looks like computer but still can't find the wire i need to check