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 PROCEDURESIDLING TEST
1999 Mazda MX-5 Miata L4-1.8L DOHC
Idling Test
1999 Mazda MX-5 Miata L4-1.8L DOHCSECTION Idling Test
1. Perform the NGS tester hook-up procedure.
2. Perform steps 1 through 8 from the DTCs Reading Procedure.
3. Start the engine and run it at idle.
4. Move the cursor to SIMULATION TEST. Press the trigger key to enter this selection.
5. Move the cursor to IDLING TEST. Press the trigger key to enter this selection.
6. The screen will display PIDs. Select the appropriate PID for testing, then press the trigger.
NOTE:
- Only one PID can be selected at a time.
7. Press START.
NOTE:
If the screen displays "TEST CONDITION NOT CORRECT", check the following three signal conditions and determine whether or not they are normal:
1. Idle SW: ON (Equipped vehicles)
2. TR SW:P or N
3. RPM:above 550
8. Press trigger key.
9. The simulation is performed for 3 seconds, and a "SIMULATION ACTIVATED PLEASE WAIT" message is displayed during those 3 seconds.
10. To perform the simulation again, press the trigger key. To exit the idling test, press the cancel key.
2. Perform steps 1 through 8 from the DTCs Reading Procedure.
3. Start the engine and run it at idle.
4. Move the cursor to SIMULATION TEST. Press the trigger key to enter this selection.
5. Move the cursor to IDLING TEST. Press the trigger key to enter this selection.
6. The screen will display PIDs. Select the appropriate PID for testing, then press the trigger.
NOTE:
- Only one PID can be selected at a time.
7. Press START.
NOTE:
If the screen displays "TEST CONDITION NOT CORRECT", check the following three signal conditions and determine whether or not they are normal:
1. Idle SW: ON (Equipped vehicles)
2. TR SW:P or N
3. RPM:above 550
8. Press trigger key.
9. The simulation is performed for 3 seconds, and a "SIMULATION ACTIVATED PLEASE WAIT" message is displayed during those 3 seconds.
10. To perform the simulation again, press the trigger key. To exit the idling test, press the cancel key.
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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.