Motor Age How2 #4: Capturing A CMP/CKP Waveform On Your Scope

In this installment of Motor Age How2, Pete shows you the mechanics of capturing a CMP (Camshaft Position Sensor) and CKP (Crankshaft Position Sensor) scope pattern, from identifying which wire(s) you need to tap into to setting up and adjusting the scope time and voltage divisions.
Questions - comments? Add them below! And be sure to give us a "thumbs up" if you find the video helpful!
Watch the pros and cons of backprobing and piercing HERE:
• Motor Age How2 - Backp...
Learn more about using the time and voltage settings HERE:
• Motor Age How2 #2: Us...
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Due to factors beyond the control of Motor Age, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Motor Age magazine (UBM Americas - Automotive Group) assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Motor Age recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Motor Age, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Motor Age magazine or its corporate parent, UBM Americas.

[@frnkjones40]

Thanks for the upload!

[@nickayivor8432]

Good Afternoon Pete Meier motor age Take care and have a great day 👍 Tutorial great thank you 👏 👌 👍 From Nick Ayivor from London England UK 🇬🇧

[@1b9e7n3z]

Always it's a pleasure tu follow your interesting vídeos, thank you and God bless you

[@samr.m.7709]

Great video Pete. Looking forward to the next video.

[@MotorAgeMagazine]

Appreciate it. Thanks for taking the time to comment.

[@MaicSalazarDiagnostics]

Great video Pete, as usual!

[@romanjaspe4172]

Thanks for the video...very well explained.

[@stevenmchenry9276]

Pete you are wonderful.

[@mike-yp1uk]

Thanks

[@CHIBA280CRV]

Fantastic thanks

[@MotorAgeMagazine]

Thanks! Glad you're enjoying it.

[@Steve-NY79]

Where does the negative wires of each channel hook up to? Im not shure , if the negitive of the battery? What about the Signal return wire? Is that a cleaner/better place to ground out too?

[@MotorAgeMagazine]

On the PicoScope, each channel is grounded separately, and the leads are designed so you can stack them all on one if you wish. The Snap-on I used in an earlier video is grounded via the #1 channel and the remaining channels are stacked on top of it. I used the battery ground terminal as my ground point because ultimately that's where the ground ends up. However, on some sensors that use a floating ground, that placement will impact the overall amplitude...so grounding it at the ECM is a better option if you need that clarity. Also, as is the case with some fuel injectors, you may think there's a voltage drop issue when there is none due to the ground side of the "floater" only reaching .4-.7 volts. I did try tracing the pattern with the scope grounded to the return wire with no difference in pattern quality. Hope this helps!

[@tgoodm1]

Hello Pete!!! With regard to the weather packs, what exactly is considered "damage"? And if damaged, can liquid electrical tape take care of it? Thanks!!!

[@MotorAgeMagazine]

I think if you literally puncture the seal, rather than go between it and the wire, it can be considered damaged. If that is the case, then I think liquid electrical tape may be an acceptable way to repair it. Let's see if anyone else chimes in with a recommendation!

[@henryrobinson9837]

the engineers that write the diagnostic charts have never had to work on them,take a little time and study the wiring diagram,they is 2 ways to do something the hard way and the easy