NO SPARK ON ENGINE CRANK. - 99 VW CABIO MK3 NOT MK3.5

1999 Volkswagen Cabriolet

Tiny

CajunSpike

March, 18, 2012 AT 12:44 AM

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.

FOUND 2772 RELATED QUESTIONS

18 Answers

Tiny

CajunSpike

March, 18, 2012 AT 12:46 AM

Pic added.

Tiny

CajunSpike

March, 18, 2012 AT 12:53 AM

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

Tiny

rasmataz

March, 18, 2012 AT 1:16 AM

Have you checked the camshaft sensor on the distributor

Tiny

CajunSpike

March, 18, 2012 AT 1:26 AM

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.

Tiny

rasmataz

March, 18, 2012 AT 2:07 AM

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

Tiny

CajunSpike

March, 18, 2012 AT 2:42 AM

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.

Tiny

exovcds

March, 18, 2012 AT 2:48 AM

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

Tiny

CajunSpike

March, 18, 2012 AT 3:02 AM

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

Tiny

CajunSpike

March, 18, 2012 AT 3:06 AM

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

Tiny

CajunSpike

March, 18, 2012 AT 3:10 AM

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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