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CMP TESTING 2004 F150 5.4L

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4 years 4 weeks ago #39021 by DigorDiePerformance
CMP TESTING 2004 F150 5.4L was created by DigorDiePerformance
Am I supposed to have a supply voltage(KOEO) on bank 1 and bank 2 wires that come directly from the ECU?
These CMP create AC voltage.
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4 years 4 weeks ago #39023 by Dave101
Replied by Dave101 on topic CMP TESTING 2004 F150 5.4L
I'm dealing with the same thing on an 08 mustang. These are VR sensors. They are supplied by a 12vdc + bias voltage. Or in some cases a - bias voltage or in some cases both. Some fords have a floating ground. If that is the case scope the + side and - side of the cmp sensor.

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4 years 4 weeks ago - 4 years 4 weeks ago #39024 by DigorDiePerformance
Replied by DigorDiePerformance on topic CMP TESTING 2004 F150 5.4L
I have no voltage on the wires from the ECU And no waveform when cranking. Ground wires are good.
Last edit: 4 years 4 weeks ago by DigorDiePerformance.

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4 years 4 weeks ago #39025 by Dave101
Replied by Dave101 on topic CMP TESTING 2004 F150 5.4L
how are you hooking up your scope? Yellow to cmp + and black to good ground?

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4 years 4 weeks ago #39026 by DigorDiePerformance
Replied by DigorDiePerformance on topic CMP TESTING 2004 F150 5.4L
Bank 1 CMP scope yellow to dark green
Scope ground to battery

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4 years 4 weeks ago #39027 by Dave101
Replied by Dave101 on topic CMP TESTING 2004 F150 5.4L
try setting up the scope yellow to dk green and black to gray/red on the other side of the sensor. Check out section 21 of the book on VR testing. A lot of good information there. Do you get a cmp signal from cmp sensor 2?

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4 years 4 weeks ago #39028 by DigorDiePerformance
Replied by DigorDiePerformance on topic CMP TESTING 2004 F150 5.4L
I'll be double dog damned. I did the same thing on a wheel speed sensor. A while back. Thanks. I have to wait till Monday now.

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4 years 4 weeks ago #39031 by DigorDiePerformance
Replied by DigorDiePerformance on topic CMP TESTING 2004 F150 5.4L
Thanks again. I'm watching the case study with the VRS case study right now. I kept searching CMP testing in the book. I know that the F150 has timing chain issues. I just couldn't figure how to get a waveform.

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