Diagnostic procedure

With the ignition switch ON (engine stopped), read the values in «Coolant Temp.» and «Intake Air Temp.». Ref. to ENGINE (DIAGNOSTICS) (H4DO) > Subaru Select Monitor > DISPLAY CURRENT ENGINE DATA .
If the values from step 1) satisfy the following conditions, idle the engine for two minutes or more.
Condition:

|Engine coolant temperature - Intake air temperature| ≤ 5°C (9°F)
NOTE:
- If the conditions are not satisfied, turn the ignition switch to OFF and wait until the parameters are satisfied.
- Hold the select lever in "P" range or "N" range at idling.
Read the temporary code using the Subaru Select Monitor or general scan tool. Ref. to ENGINE (DIAGNOSTICS) (H4DO) > Read Diagnostic Trouble Code (DTC) > OPERATION .

WARNING: When performing drive cycle O on a public road, pay sufficient attention to the traffic condition and give the highest priority to safe driving.

Drive according to the drive pattern described below.

Fig 1: Drive Cycle O Engine Speed Graph
Courtesy of SUBARU OF AMERICA, INC.
Park the vehicle on a safe place.
NOTE: Driving method while vehicle is driven to a stop at safe place is not restricted.
With the vehicle idling, read the temporary diagnostic code of DTC using Subaru Select Monitor or general scan tool.

NOTE:

For detailed operation procedures, refer to "Read Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO) > Read Diagnostic Trouble Code (DTC) .
In the step 3), if the DTC is not displayed on the Subaru Select Monitor or general scan tool display screen, the trouble is resolved.