Video Breakdown:
00:20 1994 Chevy Corvette, intermittent no start, new fuel pump installed, code 41 EST Open code
01:22 - RPM signal during cranking
01:59 - checking for spark (in-line spark tester)
03:40 - scope training videos (time base, trigger, sample rate)
YouTube - Picoscope Basics Part 1 https://youtu.be/81AGbZcgCZs
- Picoscope Basics Part 2 https://youtu.be/ntJJYhkmR4I
SD Premium - Snap-On Verus Part 11 https://tinyurl.com/y4mwwj8s
- Snap-On Verus Part 12 https://tinyurl.com/y5nms4gf
- Snap-On Verus Part 13 https://tinyurl.com/yxsw7yzr
03:53 - primary ignition current test (no control found)
05:27 - testing for power on coil + using a test light
06:24 - testing for power to the ICM
07:48 - wiring diagram of this system, description, operation and testing
09:23 - control testing with a test light videos
YouTube - No Spark Diagnostics "Control Testing" Part 1 a 2014 ScannerDanner Premium video https://youtu.be/7nHbctRwyys
- No Spark Diagnostics "Control Testing" Part 2 a 2014 ScannerDanner Premium video https://youtu.be/9U942uGTZf0
11:05 - PCM to ICM control signal test
15:40 - power feed test to the ICM
16:46 - ground circuit test for the ICM
17:06 - faulty ICM confirmed
17:23 - control test with a lab scope compared to a test light (no control)
19:00 - warning on a shorted coil damaging the ICM driver
19:50 - code 41 research
23:17 - start/stall you hear in the background was this case study https://youtu.be/eOGM-A0SRMM
23:41 - drunk guy case study
Low Fuel Pressure from a bad fuel pump ground (Ford Ranger)
https://youtu.be/rQ7tvIxQSt0
25:47 - next day, new ICM installed
27:19 - coil primary current ramp pattern compared to known bad
28:24 - coil primary voltage pattern (showing control)
29:40 - what good "control" looks like on a labscope
30:17 - what good "control" looks like using a test light
ScannerDanner Tools:
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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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Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.