There are three drive patterns for the trouble diagnosis. Driving in the specified pattern allows to diagnose malfunctioning items listed below. After the malfunctioning items listed below are repaired, always check whether they correctly resume their functions by driving in the required drive pattern.

PREPARATION FOR THE DRIVE CYCLE.
1. Make sure that the fuel remains approx. half amount [20 -- 40 l (5.3 -- 10.6 US gal, 4.4 -- 8.8 Imp gal)], and battery voltage is 12 V or more.
2. Separate the test mode connector.
  NOTE:
  - Except for the engine coolant temperature specified items at starting, the diagnosis is carried out after engine warm up.
  - Carry out the diagnosis which is marked^* on DTC twice, then, after finishing first diagnosis, stop the engine and do second time at the same condition.
3. AFTER RUNNING 20 MINUTES AT 80 KM/H (50 MPH), IDLE ENGINE FOR 1 MINUTE.
  
  Fig 1: Diagnostic Trouble Code Chart (1 Of 2)
  Courtesy of SUBARU OF AMERICA, INC.
4. IDLE FOR 10 MINUTES
  NOTE: Before the diagnosis, drive the vehicle at 10 km/h (6 MPH) or more.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Drive Cycle: Operation

Use the Manual With the Right Hardware

When to See a Mechanic