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YOUR RESEARCHCrank Position/Flywheel Sensor
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issue
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Suspected cause · Original poster
In regards to my ongoing issue with rough startups, diagnosed by the dealer as most likely an issue with the DMF, i took the transmission out and as well the DMF and the Crank Position Sensor.
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Suggestion · Original poster
I did the "twist test" everything seems to be fine, it works just as it should.
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Suggestion · Original poster
There does seem to be a lot more to testing a DMF before you can say nothing is wrong with it.
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issue
No successful repair reported for this finding.
0
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1
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Suspected cause · Original poster
In regards to my ongoing issue with rough startups, diagnosed by the dealer as most likely an issue with the DMF, i took the transmission out and as well the DMF and the Crank Position Sensor.
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In regards to my ongoing issue with rough startups, diagnosed by the dealer as most likely an issue with the DMF, i took the transmission out and as well the DMF and the Crank Position Sensor.
The original thread is here:
https://rennlist.com/forums/996-foru...-startups.html
At the first glance, i don't think there is anything wrong with the DMF. I did the "twist test" everything seems to be fine, it works just as it should. So then i found this procedure to test the flywheel sensor, and if i am reading this right it seems to be gone?
Reading between pins 1 and 2.
Reading between pins 1 and 3.
Just don't understand if it's shot, then why am i not getting the code?
A failing crankshaft positon sensor does not affect emissions thus there will (probably) be no error code.
If there is an error code, it could be a misfire error code, or codes, as the malfunctioning crankshaft position sensor (or the DMF) is causing misfires to be detected when the cylinders are just fine. The misfires arise from the inconsistent behavior of the sensor (or the DMF).
Thanks Macster, i was getting misfires on daily basis. From each cylinder and of course the total misfire with it. I think the DMF is fine, so it very well could be the sensor.
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Could be a corroded pin/ wire in the main wire harness, too. Ask Mklein about his experience with this.
That said the "twist test" is marginal at best. The Luk DMF measurement tool is the proper and accurate way to measure this.
Also, did you measure the unit warm? I've learned to warm the units up before testing. It came the hard way.
The test did require the sensor to be at 20deg C. In all honesty, my garage may have been at half of that while i did the measurements. But if this sensor is active during startup, then i would need it to show valid readings even at colder temperatures then that. I'll see if the readings change if warmer.
This must be the LUK test you refer to?
AUTOINFORM ONLINE MAGAZINE: LUK DUAL MASS FLYWHEELS DMF DIAGNOSTIC ADVICE - YouTube
There does seem to be a lot more to testing a DMF before you can say nothing is wrong with it. I don't have all of those fancy measurement toys, but i will try to replicate somehow those tests. Especially the rock test. Thanks.
This is a source reference. Confirm exact model applicability in the original material.
