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.
Key On Engine Off (KOEO) Self-Test Procedure
2001 Mazda 626 ES V6-2.5L DOHCSECTION Key On Engine Off (KOEO) Self-Test Procedure
NOTE: Make sure the A/C switch is OFF during KOEO Self-Test. If the A/C switch is ON during this test, DTC P1464 will be indicated on the NGS tester.
1. Perform the NGS tester hook-up procedure.
2. Perform the "Reading DTCs Procedure".
3. Move the cursor to KOEO ON-DEMAND SELF-TEST.
4. Press the trigger key to enter this selection.
5. Note any KOEO DTCs.
6. Press CANCEL. Perform KOER Self-Test.
1. Perform the NGS tester hook-up procedure.
2. Perform the "Reading DTCs Procedure".
3. Move the cursor to KOEO ON-DEMAND SELF-TEST.
4. Press the trigger key to enter this selection.
5. Note any KOEO DTCs.
6. Press CANCEL. Perform KOER Self-Test.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.