In order to helping our customer have a better knowledge about OBD II,we’d like to provide more knowledge about obd code reader . Here are some rapid fire OBD II questions and answers:
Q: How do we know if a vehicle has an OBD II emissions problem?
A: The MIL will be on and a DTC will be stored in memory. (Multiple DTCs may be stored.)
Q: Can the MIL come on even if the fault in the system doesn’t cause a performance problem?
A: Yes. The MIL is illuminated for emissions problems, not performance problems.
Q: Who turns on the MIL?
A: The PCM
Q How does the PCM know there is a problem?
A: It runs tests called Monitors
Q: When does it run these tests?
A: During normal driving, when conditions are just right to run the test.
Q: How does the PCM know there is a problem?
A: It receives information from sensors and performs tests of its own on actuators to see if they are working
Q: Can we watch the data used to make these decisions?
A: We can view data parameters on a scan tool.
Q: Are all scan tools created equal?
A: No. But there is a minimum standard for OBD II scan tools. It’s referred to as the Generic scan tool interface.
Should you require further information about obd code reader or other X431 diagun product,please visit www.vtoolshop.com