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.
1997 Mazda MX-5 Miata Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Fuel Pressure Hold
- Disconnect negative battery cable. Install fuel pressure gauge in fuel supply line. Reconnect negative battery cable.
- Locate data link connector in left side of engine compartment. Connect a jumper wire between data link connector terminals F/P and GND. Turn ignition on for 10 seconds to operate fuel pump. Turn ignition off and disconnect jumper wire. Wait 5 minutes and observe fuel pressure. Fuel pressure should be at least 21 psi (1.5 kg/cm2 ).
- If fuel pressure is not as specified, check fuel pump hold pressure and fuel pressure regulator hold pressure. See FUEL PUMP HOLD PRESSURE heading below and FUEL PRESSURE REGULATOR HOLD PRESSURE heading below. Also check for injector fuel leakage. See INJECTOR FUEL LEAKAGE heading below.
Factory Service Tools
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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.