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P001/0-00 Intake Camshaft position Actutor

  • robert.lesaca
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07 May 2019 22:06 #29386 by robert.lesaca
P001/0-00 Intake Camshaft position Actutor was created by robert.lesaca
This a 2011 GMC terrain 2.4L...

Here is a shot of the waveform for both Intake CKP actuator (red trace) and the Intake CMP actuator (blue trace). At idle, Intake CMP actuator0( blue trace) show some obvious dipping in voltage as compared to the Intake CKP (red trace) actuator. Are these dips enough evidence to show an intermittent solenoid failure for the intake CMP actuactor?

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08 May 2019 06:41 #29394 by jreardon
Replied by jreardon on topic P001/0-00 Intake Camshaft position Actutor
Correct me if i'm wrong but aren't actuators, computer outputs? The signals you captured are coming from the computer so any abnormalities there would be originating from the computer.

There are position actuators (outputs) and position sensors (inputs) and I would scope the position sensor signal to make sure it matches the pulse width command from the computer.

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08 May 2019 13:18 - 08 May 2019 13:19 #29406 by chief eaglebear
Replied by chief eaglebear on topic P001/0-00 Intake Camshaft position Actutor
thank you I was thinking same thing good to scope solenoid itself that wave form looked ok
Last edit: 08 May 2019 13:19 by chief eaglebear.

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08 May 2019 16:33 #29410 by robert.lesaca
Replied by robert.lesaca on topic P001/0-00 Intake Camshaft position Actutor
there are two wires from each solenoid, one is ground and the other is control. using DVOM, intake CMP solenoid showed control wire read 5.5V (im thinking bias voltage) and 0V for ground, both plugged; ohm test showed the CMP solenoid read 20.4 ohms as compared to the good solenoid of 10.4 ohms. replaced both solenoids.

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attached is a waveform of both solenoids at idle...showing regular pattern and frequency...
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08 May 2019 17:43 #29415 by chief eaglebear
Replied by chief eaglebear on topic P001/0-00 Intake Camshaft position Actutor
hi sir not to experienced but those waves look ok we are missing something

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08 May 2019 20:43 #29425 by robert.lesaca
Replied by robert.lesaca on topic P001/0-00 Intake Camshaft position Actutor
yes they are, from my standpoint. these was taken after replacing both solenoids. the absence of intermittent dips from the intake CMP solenoid is noticiably absent, plus the regularity in the highs and lows and frequency are same all through out, unlike in the early waveform posted. i also checked V esp from the CMP solenoid that earlier read 5.5V plugged in and 5.4 unplugged in control wire; now, both control and ground read 0V plugged (thus powerside) in.

Im hoping Tyler and the rest would comment...thank you.

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08 May 2019 21:27 #29431 by robert.lesaca
Replied by robert.lesaca on topic P001/0-00 Intake Camshaft position Actutor
i inadvertently always say "...Intake CKP solenoid..." i meant the Intake CAMshaft on the exhaust side.

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12 May 2019 14:36 #29572 by Tyler
Replied by Tyler on topic P001/0-00 Intake Camshaft position Actutor
Sorry I didn't see this sooner, Robert. :( Work has been super busy with my own Equinox/Terrain problems.

Do I understand correctly that you saw the voltage dip AFTER solenoid replacement?

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12 May 2019 16:04 #29573 by robert.lesaca
Replied by robert.lesaca on topic P001/0-00 Intake Camshaft position Actutor
hi tyler...no, the dip i saw was before replacing the intake camshaft solenoid. i did my wiring integrity test prior and initially meter reading on control read about 4.7 v and almist same reading on ground. checked meter n grounding and did another test. meter read 0V on ground this time n control read 5.5 V. compared with good cmpshaft on echaust side and saw both 0v plugged in, confirming powerside. so to make something not right on intake side, i scoped it and waveform saw intermittent dips. i got convince that wiring integrity good and solenoid bad. i advised owner to change both solenoid. SUV working well now...

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