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When i press on gas engine slows then revs up

Old Oct 16, 2021 | 10:16 AM
  #51  
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Yeah, only one wire should have voltage with it unplugged. There is a 5 volt feed to the sensor, from the PCM, there is a signal return wire, which is modified by TPS position, and a ground. I think you just found at least part of your problem.
 
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Old Oct 16, 2021 | 10:24 AM
  #52  
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Any suggestions on what to do now?
 
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Old Oct 16, 2021 | 10:25 AM
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Start unraveling all the wires to it?
 
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Old Oct 16, 2021 | 10:34 AM
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Unplug it at the PCM side, see if the two wires that show voltage have a short.
 
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Old Oct 16, 2021 | 10:54 AM
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I disconnected all three plugs from the PCM, there was no continuity between the two pins that had power, there was a .7ohm reading between the two outer pins
 
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Old Oct 16, 2021 | 10:57 AM
  #56  
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Which ones are which?

Wonder if the PCM is internally shorted.... Can you remove those wires from the connector, and probe the pins with everything hooked up, ignition on? See if you still have power on both pins.
 
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Old Oct 16, 2021 | 11:11 AM
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You mean remove the two wires that had 5.1 and 5.2 volts from the plug that goes into the PCM, hook everything back up, turn ignition on and probe the plug that goes on the sensor and see if they have power like before?
 
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Old Oct 16, 2021 | 11:46 AM
  #58  
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Close, remove the two wires, hook everything back up, and then probe the pins AT THE PCM and see if both have voltage. If they don't, then test the wires.
 
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Old Oct 16, 2021 | 11:56 AM
  #59  
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I think I get it LOL
So remove the two wires from the PCM plug, plug everything back in, turn ignition on and test the pcm output side, then test the pins that i just removed going to the TPS
And is it as easy as just do a continuity test on all the pins on the PCM plugs until I find the right two?
I really appreciate all your help on this.
 
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Old Oct 16, 2021 | 12:38 PM
  #60  
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Do you have the service manual? (find one here if you don't) Connector pinouts are in the electrical section.
 
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