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Old 03-17-2012, 03:41 PM   #11
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this is the used pcm that i install not the one the truck had will still have codes even tho it wasnt from this truck ?
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Old 03-17-2012, 03:45 PM   #12
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So, you take the old PCM out, put the new one in, turn power on, scan for codes and you still see the same one?
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Old 03-17-2012, 04:03 PM   #13
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yes when i check the voltage for the tps and the map they both have 1.2 volts instead of 5
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Old 03-17-2012, 04:28 PM   #14
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Conduct the same test, instead connect the negative lead of your multimeter to the PCM case.
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Old 03-17-2012, 07:18 PM   #15
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Old 03-19-2012, 02:51 PM   #16
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I did the test on the neg to the PCM case and I still have the same voltage 1.2 to the sensors on both sides the PCM pin and all the way to the sensor
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Old 03-19-2012, 03:09 PM   #17
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Uh, dumb question, but where are you getting that you need 5V from that pin?
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Old 03-19-2012, 04:19 PM   #18
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I search on how to test the sensor and they said first thing it'* to check if the sensor is receiving 5 volts and good ground from the PCM I check ground it'* good and I am not receiving the 5 volts
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Old 03-19-2012, 04:34 PM   #19
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Reason I ask is, your on a 2nd pcm giving out 1.2 volts. It just made me wonder if thats what the voltage is suppose to be.

I don't remember, but you did test/replace the TPS?
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Old 03-19-2012, 04:52 PM   #20
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Yes I replace it with a new one and what make me think maybe the PCM that I replace since it was used maybe had the same problem
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