obd I obd II
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Posts: 71,094
From: Hell was full so they sent me to NJ
Re: obd I obd II
Basically, OBD-II adds a bunch of diagnostics to catch emissions problems...
-misfire detection using a crank sensor, including misfire counts by cylinder
-after-cat O2 sensors to measure if the cats are there and working
-O2 sensor response/switching test
-tests to verify AIR system is operating
-EVAP system flow/no flow detection
-MAF rationality test, frequency range check
-coolant time to closed loop
-more sensitive EGR flow verification
-idle speed test
-traction control excessive time on
-standardized nomenclature across brands
-standardized 16-pin ALDL connector
Most of the control strategies.... e.g. A/F ratio control.... are the same. Apparently some differences in the A4 shift logic that allows higher stall convertors.
-misfire detection using a crank sensor, including misfire counts by cylinder
-after-cat O2 sensors to measure if the cats are there and working
-O2 sensor response/switching test
-tests to verify AIR system is operating
-EVAP system flow/no flow detection
-MAF rationality test, frequency range check
-coolant time to closed loop
-more sensitive EGR flow verification
-idle speed test
-traction control excessive time on
-standardized nomenclature across brands
-standardized 16-pin ALDL connector
Most of the control strategies.... e.g. A/F ratio control.... are the same. Apparently some differences in the A4 shift logic that allows higher stall convertors.
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