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Results tagged with electronic-control-module
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user 11876
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Letting Off Gas Forces Open Loop
The early OBDII engine control systems did this often. They show open loop on decel because they turn off the injectors for a bit on snap throttle close. Newer designs, usually with auto throttles, re …
- 11.7k
2
votes
Is it possible for the ECM to even attempt hitting the stoichiometric point if the pre-cat O...
Both pre and post catalyst "Oxygen" Sensors report exhaust fuel mixture to the PCM. So the PCM can and does use both to sense and adjust mixture. The rear sensor gives a better average mixture because …
- 11.7k
2
votes
Difference between P0133 and P1133
The difference is regulatory not technical. P0133 is the SAE generic version. It satisfies the USEPA and CARB that this failure is covered under a code and conforms to regulated descriptive language. …
- 11.7k
6
votes
Accepted
How is barometric pressure related to emissions testing?
The federal test procedures for vehicle emission certification(FTP) is run on a dynamometer. It starts with the vehicle at an exact temperature and barometric pressure and humidity. It is run in a lab …
- 11.7k