What happens to CAN signals on the entire network when one module has a bad ground? Can this problem be missed if the network is not measured a certain way? How do you isolate which module is causing the problem? When main grounds test good on the affected module, can testing a sensor ground or the 5V ref circuit aid in your diagnosis? Watch this video to find the answers to these questions.
Vehicle symptoms: No communication with transmission control module causing a no crank no start condition.
Paul Danner (aka ScannerDanner) is an ASE L1-certified Master Technician with nearly 30 years of field experience in electronic, electrical, and driveability diagnostics. For over 20 years he has been employed as an instructor at Rosedale Technical College, where he has taught Engine Performance Diagnostics and Electrical and Electronic Systems troubleshooting.
In addition to his popular YouTube content, Paul offers premium content on his site, ScannerDanner.com. We encourage you to check it out! You may also be interested in his book, "Engine Performance Diagnostics", available exclusively on AESWave.com.
