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.
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HOMESERVICE MANUALSMAZDA1999MX-5 MIATA L4-1.8L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESON-BOARD SYSTEM READINESS TESTS ACCESS PROCEDURE
1999 Mazda MX-5 Miata L4-1.8L DOHC
On-Board System Readiness Tests Access Procedure
1999 Mazda MX-5 Miata L4-1.8L DOHCSECTION On-Board System Readiness Tests Access Procedure
NOTE:
- This is a generic function.
1. Perform the NGS tester hook-up procedure.
2. Move the cursor to GENERIC OBD II FUNCTIONS. Press the trigger key to enter this selection.
3. Press TESTS.
4. Monitor the OBD-II systems operating status.
5. If each system's status initialization is necessary, use the following procedures:
1. Press the cancel key until you return to the main menu.
2. Move the cursor to GENERIC OBD II FUNCTIONS. Press the trigger key to enter this selection.
3. Press CONT.
4. Move the cursor to CLEAR DIAGNOSTIC CODES. Press trigger key to enter this selection.
5. Press START.
- This is a generic function.
1. Perform the NGS tester hook-up procedure.
2. Move the cursor to GENERIC OBD II FUNCTIONS. Press the trigger key to enter this selection.
3. Press TESTS.
4. Monitor the OBD-II systems operating status.
5. If each system's status initialization is necessary, use the following procedures:
1. Press the cancel key until you return to the main menu.
2. Move the cursor to GENERIC OBD II FUNCTIONS. Press the trigger key to enter this selection.
3. Press CONT.
4. Move the cursor to CLEAR DIAGNOSTIC CODES. Press trigger key to enter this selection.
5. Press START.
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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.