No matter what I did, I couldn't get Torque Pro to pull data more than about once every 2 seconds, so that's definitely an issue that creates uncertainty however, the magnitude of the deviations pretty much put the nail in this battery's coffin. A healthy battery should have all blocks within that range, so anything outside of that is suspect.Īs you can see, block voltage deviation was pretty bad. There's a drive starting around 18:11 and a "controlled" discharge test for 2 minutes starting around 18:14:35:įor convenience, the horizontal lines are spaced 0.2V. Here is the entire 37 minute recording, mostly idling with A/C bull blast. Never had occasion to do it myself, but encountered a 2008 Yukon with 124K miles throwing P061B and P0AC4 codes, so I seized the opportunity.Īt time of testing P061B was active but P0AC4 was "pending". Note the current is completely wrong, but it's usually right when you are looking at the sign, i.e., "-" is charge and positive is discharge. Zip of CSV containing Custom PID for Torque Pro attached. Post here, and I'll chart it for you and give my colorful commentary.Īll information is as reported by Torque Pro.Email the log in CSV format to yourself.Once car shuts off, or 5 minutes have elapsed, stop logging.If possible, wait until you get to at 40% SoC.If you haven't already, turn A/C & rear A/C on full blast, fresh air, minimum temp.Come to a stop wherever you want to do the test.Use very light acceleration and moderate braking to favor charging. Drive around until SoC is > 60%, higher is better.Open Torque, display your battery data but do not record.Settings icon - start recording when you want to log, stop when done, email CSV log from same menu. Setup a display showing SoC, Current and the 20 block voltages on the real-time screen.Flag the GM PIDs for logging in Torque Pro (Settings, Data Logging and Upload, Select what to log).CSV copy the CSV file to your phone and add to Torque per these instructions:
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