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 SYSTEMSKNOCK SENSORTESTING AND INSPECTION
1999 Mazda MX-5 Miata L4-1.8L DOHC
Knock Sensor: Testing and Inspection
1999 Mazda MX-5 Miata L4-1.8L DOHCSECTION Testing and Inspection
Inspection of Resistance
NOTE:
- Perform the following test only when detected.
1. Verify that the ignition switch off.
2. Disconnect knock sensor connector.
3. Measure the resistance between knock sensor terminal A and the knock sensor body by using an ohmmeter.
Specification; Approx. 560 Kohm (20°C (68°F))
4. If not as specified, replace the knock sensor. If knock sensor is okay, but PID value is out of specification, inspect as follows:
Open circuit
- Knock sensor circuit (Knock sensor connector terminal A and PCM connector terminal 2F through common connector.)
Short circuit
- Knock sensor connector terminal A and PCM connector terminal 2F through common connector to ground.
5. Reconnect the knock sensor connector.
NOTE:
- Perform the following test only when detected.
1. Verify that the ignition switch off.
2. Disconnect knock sensor connector.
3. Measure the resistance between knock sensor terminal A and the knock sensor body by using an ohmmeter.
Specification; Approx. 560 Kohm (20°C (68°F))
4. If not as specified, replace the knock sensor. If knock sensor is okay, but PID value is out of specification, inspect as follows:
Open circuit
- Knock sensor circuit (Knock sensor connector terminal A and PCM connector terminal 2F through common connector.)
Short circuit
- Knock sensor connector terminal A and PCM connector terminal 2F through common connector to ground.
5. Reconnect the knock sensor connector.
RENDER: 1.0x
NO RELATED
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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.