Hi, I have a 08 hhr ss. Recently did a new head, turbo, timing chain and a couple other thing. Car ran great for about a 100 miles and shut off. Threw a ckp P0336 code. I have changed the sensor, pigtail, pulled pan and checked tone ring. I have ohmed the wires and everything checks out. I replaced the ecm too. I have 5v on both the green and yellow wires at the sensor car will start and somewhat idle really rough then shut off and throw code. Does anyone know what readings I should be getting at the sensor with key on.

 

How did you relearn the crankshaft position sensor?

 

Did you learn the crankshaft sensor? Must be done if the sensor and/or the ECM is changed. Requires a computer to do.
The sensor is just a coil of wire. The tone ring has 58 teeth spaced at a 60 tooth spacing leaving a 2 tooth gap. The sensor senses a on/off frequency, the resistance does not mean much.

Here is a pdf of what the shop manual says:


P0336.pdf

 

How can you do a ckp relearn if the car won’t run well enough to get to the required RPM

 

The computer assists with that

 

Update: Unplugged the cam sensors and car starts and ran great. Next question both cam sensors were fairly new but I have not done the cpk relearn because my snap on solus wouldn’t do it. Do you think this could be the reason I have to unhook cam sensors for it to run?

 

Yes

 

How did it go? Did you get anything out of Donbrew’s PDF? I read it, and concluded that a short in the sensor coil is a plausible if unlikely cause of the problem. A damaged wire or bad connection causing high resistance seems more likely.

Curious:
- Just to clarify, what led to replacing the ECM? The unexplained shutdown?
- Did you try clearing the P0036 and if so, what happened?
- Seems you would know the diff between the cam sensors and VVT solenoid valves, but since there’s lots of confusion on this in the community, you’re really taking about the cam sensors on the front and back of the block on the driver side, right?
- I found it particularly interesting (and surprising) that Donbrew’s PDF stated that fuel starvation could set P0336. Since you had the head off, how confident are you in the high-pressure fuel supply? Have you checked the fuel rail pressure while running?

 

I have tried multiple scanners to try and relearn the crank sensor with no avail. It won’t let you do a relearn manually with a check engine light and the car won’t run with the cam sensors plugged in so that’s not an option either. I did replace the high pressure fuel pump but that didn’t change anything. Changing the ecm didn’t help, I changed sensors multiple times also but the only thing that worked was unplugging the front and rear cam sensor. I have a 1,000 miles on the car since doing this with the only issues being is it every once in a while it cranks for a second before starting and the engine light is on.

 

Find a quality shop with a tech two type scan tool to relearn the crankshaft position sensor.