Fault handling II, emission-related misfiring or fault in fuel system

WARNING: This page is about a different car, the 2003 Saab 9-3 and 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

When fault criteria for closed loop, adaptation or emission-related misfiring are fulfilled and any dependents are OK, a diagnostic trouble code will be generated.

To clear the diagnostic trouble code without having to take any further measures requires 1 driving cycle under similar operating conditions as when the fault first occurred or 80 driving cycles without the fault reoccurring.

The CHECK ENGINE lamp will go on if the fault reoccurs within 80 driving cycles.

For the CHECK ENGINE lamp to go out without any further measures being taken requires 3 consecutive driving cycles under similar operating condition as when the fault first occurred without the fault reoccurring.

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

Fault criteria for closed loop, adaptation or emission-related misfiring fulfilled

Fig 1: Diagnostic Flow Chart - Emission-Related Misfiring Or Fault In Fuel System
Courtesy of SAAB-SCANIA OF AMERICA, INC.

Dependents are OK
Diagnostic trouble code generated
Fault does not occur for 1 driving cycle under similar operating conditions as when the fault first occurred
Same fault occurs within 80 driving cycles
Diagnostic trouble code cleared
CHECK ENGINE lamp goes on

Fig 2: Diagnostic Flow Chart - Emission-Related Misfiring Or Fault In Fuel System
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 under similar operating conditions as when the fault first occurred and CHECK ENGINE lamp goes out.