Vehicle has 105864 miles, failed smog for air injection monitor not completed, This vehicle has tsb's for air pump but also throws codes for pump. This vehicle has no codes at all no hard codes, no pending codes. Trying to set the air injection monitor to smog vehicle. Any ideas or suggestions? previous repairs on same type of vehicle? Any info or tips would be helpful thank you in advance.
The air injection system only runs when the engine is fully cold (coolant temperature approximately equal to ambient temperature) and the ambient temperature is between 35° F. and 104° F. The ECM monitors the AIR pressure sensor, battery voltage and upstream oxygen sensors to confirm flow. Do you hear the pump run during the first cold start? Hook up scanner and watch oxygen sensor activity when…
The PCM is looking for a dramatic drop in the oxygen sensor readings when the secondary air pump comes on. If there are no codes but the monitor has not run, then typically the system is working, sort-of (otherwise there'd be a code). Tired oxygen sensors that do not drop far enough can put a car into this "not bad enough to fail; not good enough to pass" state. Also, insufficient air flow can…
are you able to run the self-test? What are your test results? is that the only monitor not set?
Up dating scan tool now to try & access that function (self-test) & yes its the only monitor not ran with no codes.
So the self test that you were referring to Frank is it the oxygen sensor test or secondary air pump?
So Computer must think the engine and air temp are close to the same and under I believe 65' F. So I use variable resistors on the ect and the iat and with a scan tool bring them within 10' of each other under 65'F. Key off, then on and start, and verify air pump runs, while watching 02 reading on Global OBD2 scan tool, as Dwight and Nate (Hi Nate) suggested.
UPDATE ON REPAIR: Reflashed pcm with autologic scan tool performed drive cycle & all monitors set for smog. thank you for all the feed back!
Hi Vince thanks for the update. One Question though, how did you find a reflash necessary, through a TSP or SI reference? Was wondering how you found out that might work. Thanks, Doug