4 ms·
Manufacturers were doing this well before OBD2. They'd look for a condition where the car was started and then idle raised and held raised, for example. Once t
by KennyBlanken 3y ago
Manufacturers were doing this well before OBD2. They'd look for a condition where the car was started and then idle raised and held raised, for example.
Once things like CANBUS became popular, as well as ECUs getting integrated with ABS/traction control, they'd look for drive wheels spinning and but not undriven wheels. When stability control systems became a thing, they could monitor steering angle and look for the car moving but not being steered, ditto for the accelerometer not detecting acceleration and cornering.
Tuners knew all about this shit because they disassembled ECU code and looked at ROM formats. They could point you right to the table used for when the ECU thought it was undergoing emissions testing. The cheating was plain as day and no government regulators cared enough to look. They probably even knew it was going on.
Here's the billion dollar question: the ECUs aren't developed by the car manufacturers. They aren't even coded by thr manufacturers. The car manufacturer just puts in maps for various engine parameters. The ECUs are supplied by companies like Bosch, Hitachi, Nippon-Denso, Magneti-Marelli, and so on.
They almost certainly knew this was going on and were complicit. Why have none of them been held responsible?
- Scoundreller 3y ago> Tuners knew all about this shit because they disassembled ECU code and looked at ROM formats. They could point you right to the table used for when the ECU thought it was undergoing emissions testing. I guess the EPAs awards aren’t that great. I wonder if they also run cars sloppy when it detects something that resembles a drive-cycle for fuel economy testing. e.g. Stop charging battery. Limit A/C or turn on mild heat to reduce radfan load. Limit power steering force. Dim lights 10%. Limit acceleration (gotta be a big one). Probably enough data out there to identify offenders by comparing real world fuel economy data to official fuel economy.
- TylerE 3y agoThe fuel tests basically already do all that as protocol. Accesories off. Accelerations are specified and extremely low (I think it was something like 30 seconds to accelerate from 35 to 55).
- jhoechtl 3y agoSone today you live a dangerous life.
- TylerE 3y agoThey DID. "A $327.5 million settlement has been reached with Bosch, the supplier of the emissions software that was installed in some 2.0-liter and 3.0-liter Volkswagen, Audi and Porsche diesel vehicles. The Bosch Settlement follows similar settlements with Volkswagen, Audi and Porsche (called the “2.0-liter Settlement” and the “3.0-liter Settlement”, or together, the “VW Settlements”)."
- spacecadet 3y agoYup, and I would argue most are not even doing the tuning, Bosch ECUs come pre-mapped to the FI system selected for the application. Maybe some performance models or chassis builders modify in house, but think of all the shared platforms used by all the big and now consolidated automakers...
- spacecadet 3y agoI mean, I can tell you first hand how easy it is to trick an OBDII emissions test just by messing with the ground wires associated to the O2 sensors and bam, you have different values being report by O2...
- bigallen 3y agoWouldn’t the state emissions system throw an error if a vehicle’s O2 sensor was reading 0/null?
- spacecadet 3y agoI cant speak for very recent systems, but they are not binary, the ECU expects a range of voltage readings...
- sokoloff 3y agoEarly OBD2 downstream O2 defeats were a simple astable timer (and, for some cars, a power resistor to simulated the heater draw). The state testing in most states now is ‘make sure the ECU is reporting “READY” and has no emissions-related codes set.’ Since the advent of OBD2, it’s become rare for a state inspection to run the vehicle live for the purpose of emissions testing. Plugging in the OBD2 scanner is way faster, cheaper, more convenient, safer, and easier (albeit slightly) on the car than using a dyno.
- TylerE 3y agoNotable, however, California, the largest vehicle market by some margin, still requires sniffer tests.