LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2.5L) - Introduction >> Drive Cycle >> Procedure >> Drive Cycle Aa
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Drive Cycle Aa

DTC Item Condition Number of driving cycles on the detecting condition
P1449 EVAP SYSTEM CLOG DETECTED (AIR FILTER) - 2
WARNING: When performing the drive cycle AA on the public road, be very careful of the traffic condition and the safe driving must be the high priority.
NOTE: Always perform the inspection mode after warming up the engine except when the engine coolant temperature at engine start is specified.
  1. Check that the battery voltage is 12 V or more and fuel remains approx. half [20 - 40 L (5.3 - 10.6 US gal, 4.4 - 8.8 Imp gal)].
  2. Using the Subaru Select Monitor, perform the clear memory for [Engine]. Refer to ENGINE (DIAGNOSTICS) (STI)>READ DIAGNOSTIC TROUBLE CODE (DTC)>OPERATION .
  3. Drive according to the drive pattern described below.
    G13650074Courtesy of SUBARU OF AMERICA, INC.
  4. Read the temporary code using the Subaru Select Monitor or general scan tool. Refer to 1ENGINE (DIAGNOSTICS) (STI)>READ DIAGNOSTIC TROUBLE CODE (DTC)>OPERATION .