VW Passat No Start - an SDP Case Study (Part 2) - [Bad Sensor Ground]

This is part 2 of a 3 part case study where I navigate through this unknown problem live with my class at Rosedale Technical College. We will dissect this VW completely, showing the exact cause of the problem. As with other classroom case studies I will be using any and all possible testing procedures to narrow down the problem area. Speed is not as important as learning these methods. But you guys that have been following along already know that. It's why your here!
link to part 3    • A Smoked ECM AND a Jumped Timing Belt...  

Symptoms
- no start
- no spark
- no communication
- no fuel injector pulse
00:00 - beginning of part 2
01:37 - identifying a shielded VRS type crank sensor circuit on a wiring diagram
03:08 - illustrating a dual cam system that uses a single cam sensor
04:19 - identifying a hall effect type cam sensor signal wire on a wiring diagram
05:30 - pierce testing at the PCM
06:05 - cmp and ckp lab-scope set-up
07:20 - waveform analysis of a failed start attempt
20:00 - determining circuit design by unplugging the sensor
23:40 - check your meter- dangers of trying to check voltage with meter leads configured for amps
26:40 - sensor signal terminal spread apart by front-probing
27:30 - bad sensor ground found while checking connector voltage
29:30 - using wiring diagram to identify sensor ground
32:40 - finding low 5 volt ref with 4.2 volts on sensor ground
37:30 - checking sensor ground at computer
43:00 - using a jumper wire to pull a bad sensor ground down to zero
48:50 - using wiring diagram to locate and check computer grounds
52:11 - outtakes

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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

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