In order to reveal an exhaust gas recirculation loop operating fault, the ECU detects 2 new faults
Throttle control fault
The ECU detects a fault on the throttle opening solenoid valve control line (terminal 39 of the ECU)
Flow sensor signal fault
The ECU detects an inconsistency between the mass of fresh air which it wants to admit via the engine and that which it measures via the flow meter