Conditions For Cold Start Diagnosis

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

Diagnosis not yet performed during this driving cycle.
Diagnosis commenced more than 8 times during this driving cycle.
Engine coolant temperature below 40°C (104°F) when engine was started.
Idling speed
Car stationary for more than 5 s.
Max. one change of status of the brake light switch.
Additional fuel from purge is less than 7 % of the engine's fuel requirements.

If the diagnosis is interrupted, the vehicle speed must exceed 4 km/h (2.5 mph) on one occasion before the diagnosis can be restarted.

While a diagnosis is in progress, the PWM of the purge valve is set to 15 % at the same time as the additional fuel from the purge is allowed to be 13 % of that required by the engine.

If the cold start diagnosis indicates a leak, the shut-off valve is activated 4 times in quick succession to remove any contamination present on the sealing surfaces of the valve.

The cold start diagnosis can be initiated with the diagnostic tool irrespective of what the coolant temperature was when the engine was started. At high temperatures and when the EVAP canister is saturated, it may be difficult to carry out the diagnosis as the additional fuel from the purge is then often more than 7 % of the engine's fuel requirements.