Need help diagnosing DMF installation

perrya

Veteran Member
Joined
Dec 16, 2011
Location
california
TDI
2006 Jetta BRM with 200K
So, my car got a new DMF installed by a German VW mechanic (non-dealer). Installation was fine. yet, afterwards, the car refused to start (car ran fine before this was done). He checked the sensors that may be impacted, they seem to be fine. He is baffled. Is it possible they were disturbed or damaged even though they look fine? Does any one know anything else that would prevent if from starting? The mechanic thinks it may be the cam sensor, even though it seems not to be damaged. The car is 2006 jetta TDI.:confused:
 

muhibmc

Veteran Member
Joined
Dec 18, 2011
Location
Toronto, ON
TDI
Previously > 2006 Jetta TDI BRM 5MT [Silver], 2000 Jetta TDI ALH 5MT [Blue] , 2005.5 Jetta BRM DSG [Grey]
does the engine turn over at all?
if it turns over does it register any reading on the tachometer?

Very common issue is the grounding wire attached to the transmission is forgotten to be attached or tightened down completely. start here.

also the cam sensor shouldnt have been touched because its nowhere near the transmission it is closer to the camshaft. and the crack shaft position sensor is unlikely, unless the mechanic damaged it somehow while installing the dmf. the only way to know if its any of the sensors is with VCDS.
 
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perrya

Veteran Member
Joined
Dec 16, 2011
Location
california
TDI
2006 Jetta BRM with 200K
The mechanic said the engine would not start, which is weird. They checked all the wiring. And the cam sensor is just being replaced out of caution. Not sure what codes were thrown. They checked the other sensors that may impact this. Not starting seems like a security issue with ECM. If the car did start but nothing else, then what?
 

JETaah

Vendor , w/Business number
Joined
Jan 18, 2001
Location
mi 48836
TDI
96 B4V, 1999.5 jettaIV,2005 BEW Beetle
removing the trans may have rattled the wiring harness where it goes from the chassis to the engine. This is touchy area that gets worked by engine vibration and can chafe the wiring harness even if it does not look like it on the surface.

The engine does not need the camshaft sensor working to start. It will take a few cranks longer if it is not working but it will start. If the the crankshaft sensor got buggered then it won't start. If the harness to the injectors lost it's ground it won't start. All these wires go to the ECU through that area in the harness near the starter.

Checking the fault codes with VCDS would tell you if any of those things got disturbed even for a second while cranking the engine.

If it did not crank at all then make sure the engine ground was re-attached.

Security issues are created when trying to start with the wrong key, ECU, cluster...and it will start anyway for a couple of seconds but won't stay running. You will see the key icon flash on the cluster when that happens.
 
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Ol'Rattler

Top Post Dawg
Joined
Jul 3, 2007
Location
PNA
TDI
2006 BRM Jetta
Please tell us, does the starter crank the engine over, or does the engine turn over and not start? a very important distinction.

If it does not crank, does the clutch petal go all the way to the floor when you depress it? Read post #7 for the problem I had with a no crank problem.

http://forums.tdiclub.com/showthread.php?t=434785&highlight=height

Also, there is a very important chassis ground located underneath the air cleaner box that may not have been reconnected or tightened.
 
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Ol'Rattler

Top Post Dawg
Joined
Jul 3, 2007
Location
PNA
TDI
2006 BRM Jetta
The mechanic said the engine would not start, which is weird. They checked all the wiring. And the cam sensor is just being replaced out of caution. Not sure what codes were thrown. They checked the other sensors that may impact this. Not starting seems like a security issue with ECM. If the car did start but nothing else, then what?
Sounds like he is just throwing parts at it instead of diagnosing the actual problem.

Have your mechanic do a VCDS scan and post the code numbers. A generic OBD2 scanner will not give you all the codes the ECU will set as some codes are VW specific and need to be read with VCDS or the dealers VAS tool.
 

GreenLantern_TDI

Veteran Member
Joined
Feb 27, 2014
Location
Iowa
TDI
2015 GOLF SEL
Yeah VCDS Scan. Grounds. If this parts throwing mechanic disturbed your rear main seal/crank position sensor the car should start after long cranking. Sorry to say but a trusted site mechanic would have saved you alota stress. Being a member since 2011 you shoulda known that.
 

perrya

Veteran Member
Joined
Dec 16, 2011
Location
california
TDI
2006 Jetta BRM with 200K
The problem is a new rear seal was installed but the toner ring was not adjusted correctly using the VW tool, so the car would not start. Crankshaft and speed sensors are fine . The toner ring must be spot on when the rear seal is replaced.
 

Ol'Rattler

Top Post Dawg
Joined
Jul 3, 2007
Location
PNA
TDI
2006 BRM Jetta
Replacing the rear main seal used to be a given when replacing a clutch.

When I converted to SMF at 50K miles, my rear main was not leaking, and after studying the tone ring procedure, I figured that with the improved Teflon seals they use now disturbing the rear main/tone ring would have been a bad idea.

At 150K miles the rear main still does not leak.
 

perrya

Veteran Member
Joined
Dec 16, 2011
Location
california
TDI
2006 Jetta BRM with 200K
Mine has 205K and no leak as far as can tell. The mechanic suggested as a precaution while it was apart. neither of us thought it would be an issue-had I known! ***
 
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