Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
KOEO/KOER Self Test
2010 Mazda 3 L4-2.5LSECTION KOEO/KOER Self Test
KOEO/KOER SELF TEST [LF, L5]
KOEO Self Test
1. Connect the M-MDS to the DLC-2.
2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.
- When using the IDS (laptop PC)
- Select "Self Test".
- Select "Modules".
- Select "PCM".
- When using the PDS (Pocket PC)
- Select "Module Tests".
- Select "PCM".
- Select "Self Test".
3. Then, select the "KOEO On Demand Self Test" and perform procedures according to directions on the M-MDS screen.
4. Verify the DTC according to the directions on the M-MDS screen.
- If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection.
5. After completion of repairs, clear all DTCs stored in the PCM, while referring to "AFTER REPAIR PROCEDURE". After Repair Procedure
KOER Self Test
NOTE:
- For vehicles with the variable valve timing control, execute a KOER self test after the variable valve timing learning is finished.
- A KOER self test cannot be executed if the variable timing valve learning in not finished.
- The variable valve timing learning is cleared if the PCM backup power supply is interrupted (including battery removal), or after reprogramming.
- To perform variable valve timing learning, the engine speed needs to be increased momentarily to approx. 2,000 rpm.
1. Connect the M-MDS to the DLC-2.
2. Idle the engine.
3. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.
- When using the IDS (laptop PC)
- Select "Self Test".
- Select "Modules".
- Select "PCM".
- When using the PDS (Pocket PC)
- Select "Module Tests".
- Select "PCM".
- Select "Self Test".
4. Then, select the "KOER On Demand Self Test" and perform procedures according to directions on the M-MDS screen.
5. Verify the DTC according to the directions on the M-MDS screen.
- If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection.
6. After completion of repairs, clear all DTCs stored in the PCM, while referring to "AFTER REPAIR PROCEDURE". After Repair Procedure
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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.