to get all OBD2 codes, one must drive car 2 times at least (OBD2 jive yes) called driving cycles.
2 driving cycles , to get the more advance better codes like lean or rich and misfire codes. but many scan tolls good have PENDINGS button, that discloses these,.
many DTC can set if present for 0.5 second to 5seconds, no matter what. or on engine temps are hot only.
some take only 2 ignition on cycles. not driving cycles (cold to hot the cold repeat) 125 slow close loop (late) is this, 2cycle ign.
02 sensor tests P0131 (and others) , needs 20mph more , 2500rpm or more and for 20seconds, in closed loop (steady right foot cruise) or the test is not done. (tricky no?)
No drive-able car testing, I can help:
the only way to use OBD2 , is to drive 2 or 3 times cold to hot engine,. (or on some the 2 Ignition cycle rules)
or drive and log DTC or PEndings (many times up to 3)
or parked, get engine hot, run scan tool and try in neutral park, HOT engine 180F is hot , or thermostat is bad )
the try idle speed, for 20seconds, key off, then start again repeat 2 or 3 times. then try 2500 , by hand on throttle, same way, for 20 seconds. (3x)
VSS test only happens at fuel cut mode, was say cruising and you lift right foot off pedal. 5 sec, test, long. P0500
DTC0505 (idle speed controller issues) takes 2 Ign cycles to set of fails 2 times) ISC fails>!!!!
try to simulate actual driving parked to see all DTC's possible, (some are not possible,, like all tranny codes all, and more.
EVAP tests only set at 2 ignition runs and 2 fails. and only hot engines. and only 1000 to 3000 rpm engine, and the test can take 20 full minute to complete, (yah minutes) later 443 is idle only test.
DTC 300 misfire. less than 4000 RPM, fuel tank above 15% full, no empty reading. steady throttle, (cruise or idle)
As rule all catastrophic tests (OBD) will set in 1second running the engine, (example dead sensors) that is why low numbers errors are diagnosed first,
Is your engine attaining closes loop status , hot,? at idle or at 2500 rpm holding throttle steady. ?
and do not forget to use the pending button after 2 hot runs. or 3 runs. use it to see errors (real) that have not set yet, and freeze-frame data too..... all this is key to diagnosing any OBD2 car, 1996 up.
some tests are not done below (41 °F) (air temp , seen at IAT sensor) make sure air cleaner is not dirty and packed up or the FAM can fail.
Make sure the maf is clean, use spray cleaner, hold nozzles 8 inches back so as not to damage the fine element inside, spray let sit for 1 min and repeat, say 3 times,
Some MAFs have self clean mode, but not this car, and will coke up say 50kmiles on freeways .
2 driving cycles , to get the more advance better codes like lean or rich and misfire codes. but many scan tolls good have PENDINGS button, that discloses these,.
many DTC can set if present for 0.5 second to 5seconds, no matter what. or on engine temps are hot only.
some take only 2 ignition on cycles. not driving cycles (cold to hot the cold repeat) 125 slow close loop (late) is this, 2cycle ign.
02 sensor tests P0131 (and others) , needs 20mph more , 2500rpm or more and for 20seconds, in closed loop (steady right foot cruise) or the test is not done. (tricky no?)
No drive-able car testing, I can help:
the only way to use OBD2 , is to drive 2 or 3 times cold to hot engine,. (or on some the 2 Ignition cycle rules)
or drive and log DTC or PEndings (many times up to 3)
or parked, get engine hot, run scan tool and try in neutral park, HOT engine 180F is hot , or thermostat is bad )
the try idle speed, for 20seconds, key off, then start again repeat 2 or 3 times. then try 2500 , by hand on throttle, same way, for 20 seconds. (3x)
VSS test only happens at fuel cut mode, was say cruising and you lift right foot off pedal. 5 sec, test, long. P0500
DTC0505 (idle speed controller issues) takes 2 Ign cycles to set of fails 2 times) ISC fails>!!!!
Quote:"Difference from target speed is 100 RPM lower than (699 fail)
target value.
Difference from target speed is 200 RPM greater (most times is 800 rpm so 1001 is fail)
than target value.
Engine coolant temperature is between 70°C
(158°F) and 110°C (230°F).
Intake air temperature is between -10°C (14 °F) and (as you can see tests will be dead in Alaska ,etc)
70°C (158°F).
Barometric pressure is greater than 75 kPa.
In closed loop. "
try to simulate actual driving parked to see all DTC's possible, (some are not possible,, like all tranny codes all, and more.
EVAP tests only set at 2 ignition runs and 2 fails. and only hot engines. and only 1000 to 3000 rpm engine, and the test can take 20 full minute to complete, (yah minutes) later 443 is idle only test.
DTC 300 misfire. less than 4000 RPM, fuel tank above 15% full, no empty reading. steady throttle, (cruise or idle)
Quote:"fuel trim checks like P0171?
Vehicle speed above 32 km/h (20 mph) and engine
rpm greater than 2000 RPM for 20 seconds in
closed loop."
As rule all catastrophic tests (OBD) will set in 1second running the engine, (example dead sensors) that is why low numbers errors are diagnosed first,
Is your engine attaining closes loop status , hot,? at idle or at 2500 rpm holding throttle steady. ?
and do not forget to use the pending button after 2 hot runs. or 3 runs. use it to see errors (real) that have not set yet, and freeze-frame data too..... all this is key to diagnosing any OBD2 car, 1996 up.
some tests are not done below (41 °F) (air temp , seen at IAT sensor) make sure air cleaner is not dirty and packed up or the FAM can fail.
Make sure the maf is clean, use spray cleaner, hold nozzles 8 inches back so as not to damage the fine element inside, spray let sit for 1 min and repeat, say 3 times,
Some MAFs have self clean mode, but not this car, and will coke up say 50kmiles on freeways .
http://www.fixkick.com