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 SYSTEMSFUEL TANK PRESSURE SENSORTESTING AND INSPECTION
1999 Mazda MX-5 Miata L4-1.8L DOHC
Fuel Tank Pressure Sensor: Testing and Inspection
1999 Mazda MX-5 Miata L4-1.8L DOHCSECTION Testing and Inspection
FUEL TANK PRESSURE SENSOR INSPECTION
NOTE:
- Perform the following test only when detected.
1. Inspect the fuel tank pressure sensor for damage and cracks.
2. Vacuum hose improper routing kinks or leaks.
3. If correct the above inspect, inspect as follows:
Open circuit
- Fuel tank pressure sensor connector terminal A and PCM connector 2A through common connector.
- Reference voltage circuit (Fuel tank pressure sensor connector terminal C and PCM connector terminal 21 through common connector.)
- Ground circuit (Fuel tank pressure sensor connector terminal B and PCM connector terminal 3F through common connector.)
Short circuit
- Fuel tank pressure sensor connector terminal A and PCM connector terminal 2A through common connector to ground.
- Fuel tank pressure sensor connector terminal C and PCM connector terminal 21 through common connector to ground.
4. Reconnect the fuel tank pressure sensor connector.
5. If correct the above open or short circuit, replace fuel tank pressure sensor.
NOTE:
- Perform the following test only when detected.
1. Inspect the fuel tank pressure sensor for damage and cracks.
2. Vacuum hose improper routing kinks or leaks.
3. If correct the above inspect, inspect as follows:
Open circuit
- Fuel tank pressure sensor connector terminal A and PCM connector 2A through common connector.
- Reference voltage circuit (Fuel tank pressure sensor connector terminal C and PCM connector terminal 21 through common connector.)
- Ground circuit (Fuel tank pressure sensor connector terminal B and PCM connector terminal 3F through common connector.)
Short circuit
- Fuel tank pressure sensor connector terminal A and PCM connector terminal 2A through common connector to ground.
- Fuel tank pressure sensor connector terminal C and PCM connector terminal 21 through common connector to ground.
4. Reconnect the fuel tank pressure sensor connector.
5. If correct the above open or short circuit, replace fuel tank pressure sensor.
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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.