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Old 05-07-2019, 05:34 PM   #21
Designie
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2006 VUE Red Line
Default Re: 06 Redline will not run/idle while cold

Well I'm not sure if I'm doing something wrong. I have the sensor out, and I do not get any resistance between any of the 6 contacts on the switch. I started with 1 & 2, 1 & 6 then 2 & 6. Nothing. Then touched every combination of 2 contacts. Should I be seeing some resistance reading?

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Old 05-07-2019, 06:02 PM   #22
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2003 L-Series 3.0L Sedan
Default Re: 06 Redline will not run/idle while cold

Yes, there should be some resistance between 1&6, 1&2, 2&6. Whenever using a multimeter for resistance measurement, there are at least two resistance ranges to select from. I usually touch both probes together and expect 0.00 or 000 on the display - a short circuit with zero resistance. Most meters I use show a tiny bit of resistance from metal probes, 0.002. This is acceptable. Testing resistance function by touching probes together and seeing a displayed reading ensures the multimeter is working. This might described as a baseline test. Then measuring a sensor is next. Keep in mind - crank sensors should measure in hundreds of ohms so the higher value resistance function should be selected on multimeters. Good multimeters will display 'ERR' or something similar if the selected range is incorrect.

Test the other sensor as each sensor should have at least one resistance value, ideally three. If no resistance is measured, this implies open circuits and would correlate with no engine run with a cold engine yet somehow work just enough to get the engine to run until it warms up(?). An open circuit/zero resistance means the sensor(s) is/are broken, internal circuits failed. If this is the case, replace it. If you like, rap it against the bench a few times and measure. Immerse it boiling water and measure. Cold, heat and vibration are the normal environment crank sensors operate in.

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Old 05-07-2019, 07:05 PM   #23
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2006 VUE Red Line
Default Re: 06 Redline will not run/idle while cold

So I checked resistances, I was able to get a reading on all three circuits of each of the 2 sensors. It was really difficult to get it to read some of the contacts. It also seemed to make a difference which probe was on which contact. I thought resistance didn't matter which pin you had red on and which one you had black on.
So the readings were all pretty similar with the switch cold, except pins 1 & 2. The other combos were .68-.75 megaohms and 1 & 2 was 30. Then I submerged the sensor in boiling water and the readings fluctuated pretty wildly. So I'm not too confident in my measuring, but it definitely was reading something.

Voltage at the plug on the car was good on both circuits. 4.7v and 11.85v on both.

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Old 05-07-2019, 08:47 PM   #24
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Default Re: 06 Redline will not run/idle while cold

Try measuring this sensor again. Leave it in the ice box, terminals facing up in a cup or soup can of water until frozen for an hour or so and measure resistance. Freezing cold, desert heat and engine vibration shouldn't affect resistance much with a slight variance. Be sure terminals are clean and free of conductive fluids like dirty oil. If resistances very greatly from freezing cold to boiling water, replace it. This isn't an inexpensive part. Rockauto lists a GM replacement at $125. All others are much higher.

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Old 05-23-2019, 11:24 AM   #25
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2006 VUE Red Line
Default Re: 06 Redline will not run/idle while cold

Well after about as much testing as I could do with a meter, I cannot point to anything abnormal because really the readings for resistance are strange. I have had the sensor out of the car for a couple weeks. I've had the plug tucked up under the car to try and dry it out if maybe water of something was in there.

I reinstalled the sensor again yesterday, and no change. It ran horribly and I kept restarting it and keeping it running until temp was up. Once operating temp was up to normal, of course then it runs perfect.

I am stuck trying the old "Buy a new part and try it" road. Crazy how it would just happen to go bad at the exact time I changed the water pump. It's just so beyond coincidental.

I will report back when I try the new sensor.

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Old 05-23-2019, 02:28 PM   #26
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2003 L-Series 3.0L Sedan
Default Re: 06 Redline will not run/idle while cold

Part failure occurs in several ways. Random failure, failure while driving, failure after letting a vehicle sit overnight or after several days, weeks or months, etc. This isn't to make you feel better but my fuel pump died one state away from home with family on board. Another family member was called to meet us to bring us home. The next day was spent haggling with the tow company refusal to tow my car when insurance authorized the tow. Towed to my choice of garage and new pump went in. Another occasion was driving home from work when my crank sensor promptly died on a three lane highway. Coasted across three lanes to a nearby exit to a grassy area off the exit road and called a family member for help. As I waited, I tested the crank sensor (the tach died as one indication of a dead sensor while at highway speed (65 mph?) and measured incorrect resistance (much higher than expected). About 30-45 minutes later help arrived and I measured the sensor again with a better reading, started up (engine cooled down a bit) drove on local streets when the engine died again, coasting into a perfect parking spot. Returned later with a new crank sensor and drove home. Mechanical and electrical parts fail in their own time regardless of when or where.

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