2009 Chevy Traverse AWD 3.6 P0335

Hello everyone,

Im Cris, I appreciate anyone taking the time reading this!! There's a long story behind this vehicle. lol I bought it then they had codes p0016, timing codes, so I decided to replace timing components. The chains, tensioners, guides, oil pumps, water pump, camshaft phasers, crank and camshaft sensors, camshaft phasers solenoid's. Then i ended up replacing the catalytic converters. it ran for awhile, then it started to have miss on cylinders 2,4,6. so I decided to redo the timing again, thinking I messed up was a tooth off in timing causing the misfiring. It ran but still the miss fire 2,4,6!

I decided to replace the throttle body, and new Maf sensor, then I used snap on verus pro to reprogram the throttle body. thinking it would fix the missing on 2, 4,6. didn't work. so latter was running it and it died. wouldn't start. then ran the codes & P0335 crankshaft position sensor signal. So I checked for 5 volts on the gray wire, it had 5 volts there. so I decided to but a new crank sensor and put it in. didn't work. I was at my friends shop had the key on, decided to wiggle the crank shaft sensor wire, and noticed it would kick the fuel pump on & off when I wiggled the wires. Then I decided to buy a new crankshaft plug end, and I rewired it in, using solder and heat shrink, but messed up with the wiring! I wired the gray 5 volt & the tan low reference wire back words. I also choose to buy a EMC with the new updated software, thinking it would solve the problem with the misfires. but it didn't fix it. I put the new computer in before wiring the crankshaft plug wrong. I don't know if runt the computer after wiring the crankshaft plug wires wrong?

I tried to figure it out!! It would run fire a little, then die right away! & code p0335, at one time I did get p0336. but p0335 know. I have a couple off pics to put with this. It show or explains the thinks I did & results, and then the wiring diagram. I checked for continuity after rewiring the crank wires after I did it wrong. then I used scanner to verify each wire had continuity at the crank plug to related pin on back of computer. they all had continuity. The pin 3 on the crankshaft senor gray wire had 5Vts, the tan wire at crank sensor to ground had 0.01vlts. I used the scope turned on the key with crank senor plugged in & put metal behind it. thinking if I did that. On the scanner the 5volt signal would drop to zero every time I put metal under crank sensor. It didn't drop down to 0vlts, so I thought I burnt up the crankshaft position sensor I put in when I wired it wrong. Then I bought another crankshaft sensor thinking it would solve the problem? Hope I didn't damage the computer some how wiring the crankshaft sensor wire!!

The pics are a list of the things I did the other day to try to figure p0335 code & fix it, and the other one is pic of the wiring for the crankshaft sensor. I'm not sure what to do next after everything I've done!! The last thing I found out is that I took the crankshaft position sensor off, then I check for voltage at back of the computer on pin 35 signal wire. and my scanner said there was 5vlts there at the computer with crank sensor off??? I not 100% sure if its suppose to read 5vlts there on pin 35 with sensor disconnected??? think or wondering if some where some how the 5volt gray wire is toughing the yellow wire some wear in the wiring harness causing this, or the 5 volts suppose to be there with sensor off? I don't know!! I'm new to figuring stuff like this out!! I hate wiring problem!! LOL I'm not sure what my next move is.

Thank you for your time reading this! I appreciate it and any advise with this wonderful traverse. LOL

Wether there should be voltage on the signal wire with the sensor disconnected depends on the circuit design: on a pull down design it's totally normal to see voltage on he the sensor when disconnected. A pull up design wouldn't.

There also may be bias voltage present, though typically this is not 5 V but a different voltage level.

You may want to disconnect the harness from the sensor and from the pcm as well and check then for a short/continuity between the grey and yellow wires.

Thank you for your time and advise.. I appreciate it a lot!! I did a continuity test on all 3 wires from the crankshaft sensor to the computer to confirm I had it wired right this time. I know each wires had continuity with the computer unplugged. All the wires are on the right circuit. I believe the its a pull down design. when I used the scope , had the tee pin on the back of the computer on pin 35, the CRK signal wire, the scope said 5volts, constantly. with key on I believe its a pull down design circuit.

I know I tried to test the new crank sensor. I plugged it in, then the key on, I put tee pin on the back of the computer on pin 35, crankshaft signal wire, the scope said 5vlts. I put a piece of metal under the crk sensor to see if the volt would drop to zero, and it didn't! IT confused me because it was doing the same thing as the older crank sensor I just had in??? I believe the computer uses the low reference wire to create a square wave, drop the voltage to zero.

thanks for reading this!! I don't now if anyone has any more ideas, or suggestions on what to do or check next. Thanks!!! Appreciate your time & information a lot!!!!!

I read it again, slower!! its a pull down design. So the 5 volts is going to be at the computer on pin 35 crank signal wire with sensor unplugged. next step is to just put the sensor back in place and see if the traverse will actually stay running. lol If I put everything back together & it still wont run. I have the scope on, with tee pin on back of computer on pin 35, signal wire, and crank it over, and I don't see the voltage drop down like it suppose to on the scope. then what do I check?

I know there's continuity on all 3 wires. Gray wire at the crk sensor has 5vlts at the sensor with key on, the pin 1 low reference wire has 0.01 vlts from ground There is 5vlts when I jump across the pin 3 5vlts supple and touch the pin 1 low reference wire at the crank sensor wire key on. At pin 2 signal wire at sensor there is 5vlts present when I touch good ground,

thanks for your time reading this!! Appreciate it a lot!! Have a great Day!!!!!

You still may have a short between the signal wire and ground or voltage. Do you get a signal on the scope at the computer when cranking over?

The signal will be seen on what's called the signal wire, not on the low ref one. Yes, the V ref and the low ref wires are needed to make this hall effect sensor toggle the signal between 5 and 0 volts but the signal/square wave will show up up on the signal wire only, not on the low ref one.

Again, do you get a square wave when cranking the engine?

(Just putting a piece of metal to the sensor tip may not be enough to test the sensor accurately, you would have to move it close to and away from the tip continously in order to simulate a signal.)

You get 5V on the low ref wire athe pcmwhen bypassing the sensor between V ref an low ref?

I appreciate your information! I hate wiring problems. LOL MY vehicle is at a friends shop know. & we going to have a bad weather her for a few days. i might not be able to get back to testing things for a few days. I didn't put the sensor back in vehicle yet, because i was questioning the 5vlts at signal wire on computer pin 35. I wanted to make sure if it was good or bad! before putting it back together! It could be a few days before I can get back to doing thing with the vehicle, bad weather. I will let you know the results when I can get it done! I do know the wire at the crk sensor were hard to strip off the wire shield!! Like the wire the plastic melted into the wire a little? It was hard to get down to the raw metal with out breaking the wires off to resolder it!! outside of wires looked normal!! thanks for your time & information!!! I let you know when I get it back together, & if the scope show the sqaure wave when cranking. or if it still just stays at 5 vlot reading on the screen when cranking.

Have great day!!!

Hello,
Thanks for your information!! I was curious about hooking up the cables to the scope the right way for reading the crank sensor? I know I hook up the yellow wire to back of computer on pin 35 where the crk sensor signal wire is, but not 100% sure witch way to put the black wire ground for scope? Do I put it on a good know ground or put it on the low reference wire pin 46 low reference on back of computer. So I know its hooked up right. see what the scope says when I turn it over.

Thanks for your time!! and information!!

Best to hook up the ground lead to a known good chassis ground, especially when using multiple channels on a scope with common grounds. That way you will avoid potential (dangerous) ground loops.

Nevertheless when looking at only one channel at a time you could use the low ref to connect the ground wire to .

I put everything back together
. I used a common ground. & I got 5 volts when key on at pin 35 at computer. I cranked it then rerun the video, & the voltage didn't drop down at all cranking.

I used pin 46 low reference on back of computer. I didn't get 5 volts when turn key on! The scope reading were goofy!! Volts jumped up & down 80 to negative -40???

I had my common ground at on time off & didn't now it & it was doing the same thing on scope? Plugged the ground back on got 5 volts.

Maybe I'm not getting a good ground from 4 the pin 46 low reference wire from crk sensor??

Maybe I need to run all new 3 wire from the crank to computer?? I'm not sure what to do next!! Key on 5vlts at computer on crk signal. But when crank it doesn't drop down to zero? Could there be a problem with computer now? I have the old one! I have the new program pcm in know.

Thanks for reading, & your help is appreciated a lot!!

Take a step back:

Make sure/double-check all wires are in the correct plug terminals, eg tan wire at sensor plug #1 and pcm #46, sensor plug #2 yellow wire to #35 at pcm and finally #3. at sensor plug (grey wire) to pcm #45.

Verify the corresponding voltage levels with koeo..

Check for a crank signal while cranking. If not present try to simulate one pulsing the signal wire to ground with a test light and looking for rpm pid in scan data (also, does the fuel pump kick in?)

If you don't get any rpm that way then doublcheck the yellow signal wire makes it to the pcm. If it does then you're looking at a pcm issue.

If there is an rpm signal while pulsing the sensor make sure the reference voltage on pin 3 does not disappear while cranking (with the sensor plugged in). If no problem with Vref then verify low ref, again while cranking. If any doubt jumper the tan wire from pin #1 directly to a good ground.

If the above tests turn out ok and there is still no signal/rpm reading while cranking make sure the reluctor is actually spinning and the sensor actually is not broken.

Report back from there.

Hello,

Thanks 4 your information! I appreciate it a lot!! The fuel pump kick on when I turn the key. 60psi. I used the scope & used the test light to simulate a pulse,when I touched the crk signal wire at the computer it created a wave & dropped down to zero like it's suppose to. Then I checked the rpm reading , & it showed rpm when I used the test light touched the signal wire crk at the back of computer.

I tried cranking it, when I cranked engine the scope stayed at 5vlts. I have pictures to show u. Had the battery disconnect to charge it. Before even cranking engine. I received codes? Just by touching the crank signal by computer. P0336 crank position sensor performance, then
P0122 throttle position sensor circuit low voltage
P2101 throttle actuator position performance
P0335 crank position circuit not pass test
Maybe I caused the codes when I was grounding the crank signal at computer? I now I heard the throttle move.

I'll send pics with to show what happened.
Thanks 4 all ur help!! It really appreciate a lot!! Please let me know what u think about what u see with the pics & about the results with things I've done already & suggestions on next step.

Thank you so much!!