Cam/crank Corr. codes
1G1PD5SH3C7133097
For some reason, I couldn't get the vin in the description.
Back story, My customer bought this a week ago from people that don't speak English very well. Two days after purchasing, MIL illuminates. He takes it back to these guys, they replaced both cam sensors with the duralast brand sensors. 4 hours later the light is back and he brings it to me.
Being a correlation code, My first check was to put it to TDC and see if the alignment tool will fit where it is meant go. It all lined up fine(see Pics). Next, I scoped the signals. I have an abnormal amount of Hash in my signals. Also, the first two captures were of the duralast sensors. The sensors would only pull down to 1 volt, meaning that I had a 1 to 5 volt square wave. Up to 5 and down to 1. After installing the original sensors, the sensors produced what I would call normal, 0-5 volt square wave(except for the hash). I did try unplugging the Alternator, but the hash was still there.
Does anyone have a Known good cam/crank for this? I did find one for a 2015, and if it is supposed to be the same, I must have phaser/solenoid problems. It puts the intake 31 degrees out and the exhaust 18 degrees out.
Has anyone seen this kind of hash on a GM? Is this caused by caps in the PCM? Do you think the hash would cause my codes?
I guess next I will pull the solenoids out and see if I can see them sticking. I have used the scan tool to actuate both of them and they do function.
Other things to note:
1)I have only seen the p0017 exhaust cam corr. code. My customer showed me a picture of a hand held with p0016 intake corr. code.
So, it does set them both but I have only seen one(intake) at this point.
2) At idle, the PCM desired and actual intake cam position was about 8 degrees. The duty cycle(%) was around 55%. I was thinking that was high for that small amount of angle change. Is this indicative of an oil pressure issue?
Waveform1 and 2 are basically the same(uploaded accidentally), 3 is after installing the original sensors, and 4 I finally changed the time base so we could see 720 degrees.