Fault handling III, other emission-related components and function

WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

A diagnostic trouble code is generated when the fault criteria have been fulfilled and any dependents are OK.

For the diagnostic trouble code to be cleared without any further measures being taken requires 1 driving cycle without the fault reoccurring. The CHECK ENGINE lamp goes on if the fault occurs during the next driving cycle.

For the CHECK ENGINE lamp to go out without any further measures being taken requires 3 consecutive driving cycles without the fault reoccurring.

For the diagnostic trouble code to be cleared requires a further 40 fault -free warming -up cycles.

Fault criteria fulfilled

Fig 1: Diagnostic Flow Chart - Other Emission-Related Components And Function (1 Of 2)
Courtesy of SAAB-SCANIA OF AMERICA, INC.

Dependents are OK
Diagnostic trouble code generated
Fault does not occur during 40 warming -up cycles
Same fault occurs during next driving cycle
Diagnostic trouble code cleared
CHECK ENGINE lamp goes on

Fig 2: Diagnostic Flow Chart - Other Emission-Related Components And Function (2 Of 2)
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Fault does not occur during 40 warming -up cycles
Fault does not occur during 3 consecutive driving cycles
And
CHECK ENGINE lamp goes out