No spark on engine crank. 99 VW cabio Mk3 NOT Mk3.5

Tiny
CAJUNSPIKE
  • 1999 VOLKSWAGEN CABRIOLET
  • 90,255 MILES

New: coil, cap, rotor, coil wire, plug wires, plugs, crank position sensor, battery, electrical end of key switch.
Swapped in substitute ecu, same part number, different suffix. My ecu ends with Q. Swap ends with D. Otherwise same part number.
Verified continuity of crank position sensor center wire back to ecu harness. Verified continuity of distributor sensor center wire back to ecu. Did not check +- on either connector.
Nothing I've changed has made coil spark. Alarm did go off when fresh battery installed. Reset using key in driver door unlock.
Starter cranks normally. Just nothing works to allow the system to spark. This is making me nuts. Any help appreciated.
testing spark by grounding coil output wire to block.
check engine light on with key on.
no codes showing with obd reader.

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Sunday, March 18th, 2012 AT 12:44 AM

18 Replies

Tiny
CAJUNSPIKE
  • MEMBER

Pic added.

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Sunday, March 18th, 2012 AT 12:46 AM
Tiny
CAJUNSPIKE
  • MEMBER

Also removed/cleaned/reconnected valve cover ground and block ground wires.

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Sunday, March 18th, 2012 AT 12:53 AM
Tiny
RASMATAZ
  • MEMBER

Have you checked the camshaft sensor on the distributor

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Sunday, March 18th, 2012 AT 1:16 AM
Tiny
CAJUNSPIKE
  • MEMBER

I tested continuity from the camshaft sensor center wire up to the ecu, thru the harness. If there is a specific way to test the sensor, please let me know.

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Sunday, March 18th, 2012 AT 1:26 AM
Tiny
RASMATAZ
  • MEMBER

Check the CMH wiring for short and open circuit back to the computer if okay-have the computer tested-also go this link: http://www.youtube.com/watch?v=itMXO56z1tw

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Sunday, March 18th, 2012 AT 2:07 AM
Tiny
CAJUNSPIKE
  • MEMBER

Very good link. I found a similar car in the junkyard. I'll go pull the distributor if it exists, and use it to trouble shoot this issue. 100% thanks for your interest and help. This isn't finished until the car starts.

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Sunday, March 18th, 2012 AT 2:42 AM
Tiny
EXOVCDS
  • MEMBER

Cam/distributor signal is hot needed on this engine for it to run... the crank signal is the main
input. Crank sensor output should be close to 2V AC or more while cranking.

http://www.picoauto.com/waveforms/images/zoom/crankshaft_sensor_inductive_cranking.png

Thomas

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Sunday, March 18th, 2012 AT 2:48 AM
Tiny
CAJUNSPIKE
  • MEMBER

Then that brings up the question of how to test the crank sensor. I just spent 5 hours installing a brand new one.

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Sunday, March 18th, 2012 AT 3:02 AM
Tiny
CAJUNSPIKE
  • MEMBER

I've got a dvom. But thats about it as far as test equipment goes.

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Sunday, March 18th, 2012 AT 3:06 AM
Tiny
CAJUNSPIKE
  • MEMBER

Again, I confirmed continuity from the center crank position wire to the ecu wiring harness. Not sure what voltage or ground is on wires 1/3. I could test that too if somebody knows which is which.

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Sunday, March 18th, 2012 AT 3:10 AM

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