1. Start and run engine at 2,000 rpm for two minutes to bring the engine up to nromal temps and warm up the Oxygen sensors. The engine must be at least 180°F (82°C) to pass.
2. Turn off engine, and wait 10 seconds. Make sure the vehicle is safe:
a. Transmission in PARK or NEUTRAL.
b. Apply parking brake.
c. Block the wheels, what ever it takes!
d. Turn off electrical loads (A/C, heater, etc.)
3. Check the Base Timing and make sure the computer is controlling the timing before continuing with test.
4. Ground the STI, just like the KOEO test.
5. Start the vehicle.
6. The first set of flashes you will see is the Engine ID code. For gasoline engines, the engine ID code equals half the number of cylinders (4 pulses = 8 cylinders). Diesel engines have an ID code of 5 flashes. These codes are used to verify the proper PCM is installed and that the KOER Test has begun.
7. After the engine ID code you need to test a few items for the computer. You’re vehicle might not have any or all of these items to test.
a. Brake On/Off (BOO) circuit, the brake pedal MUST be depressed for 1 second and released.
b. Power Steering Pressure (PSP) switch, quickly jerk the steering wheel one-half turn and released.
c. Transmission Control Switch (TCS) for the E4OD or 4R70W auto transmission, press the O/D off button 2 times, turning it ON and OFF.
8. The computer will begin to test many components; you will hear the idle change watch the check engine light closely.
9. After many tests the computer will flash once, indicating a Dynamic Response test. This single flash is prompting you briefly push the gas pedal all the way down (do not over rev the engine).
10. After a little while the check engine light will start flashing codes at you.
11. After you've gotten all the codes turn the engine off, and remove the ground wire from the STI.