RPM Reading Without Cam Sensor Connected?

ihredneck

Veteran Member
Joined
Dec 4, 2015
Location
Missouri
TDI
2000 Jetta, 2006 Jetta
Will a 2006 Jetta TDI BRM 5-speed have RPM's on the tach and/or VCDS if the cam sensor is unplugged?
This is assuming a good engine speed (crank) sensor/wiring.
 

Dannyboy

Veteran Member
Joined
May 25, 2013
Location
Mb
TDI
2014
Unplugging the cam will cause a CEL and a tiny loss of power but rpm will still read.

Unplugging crank sensor it won't run or have tach signal
 

ihredneck

Veteran Member
Joined
Dec 4, 2015
Location
Missouri
TDI
2000 Jetta, 2006 Jetta
That's what I thought as far as the RPM readout.

Got a no start condition, no codes (via VCDS) related to the CPK and reads 275 RPM while cranking. Then when I unplug the cam sensor no RPM via tach or VCDS. I must have a bad crank sensor or wiring, though I'd expect a code to be thrown.
 

Rx7145

Veteran Member
Joined
May 21, 2017
Location
Ohio
TDI
2006 Jetta BRM
From what I understand, the computer doesn’t always flag crank sensors. I’ll look at the wiring really carefully.
 

ihredneck

Veteran Member
Joined
Dec 4, 2015
Location
Missouri
TDI
2000 Jetta, 2006 Jetta
I have already pulled the tape and sheathing from the injector pigtail connector back to the battery box. Some chaffing but no smoking guns.
I will pin-out the wires back to the ECM as well once I figure out how to get the connector off the crank sensor...that thing is buried in there.
 

Rx7145

Veteran Member
Joined
May 21, 2017
Location
Ohio
TDI
2006 Jetta BRM
There is a YT video of a guy using a pick to release the lock. To change the sensor you’ll probably need to remove the oil filter assembly.
 
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