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.
1988 Mazda RX-7 Base, 2D ConvertibleFACTORY OEM SERVICE PROCEDURE
Heat Hazard Sensor
- To check system operation, turn ignition on. The "OVER HEAT EXH SYSTEM" light should activate. Start engine and light should go out.
- Remove right seat and lift up floor mat. Disconnect heat hazard sensor connector. Connect jumper wire between connector terminals. Check that "OVER HEAT EXH SYSTEM" light activates.
- To check heat hazard sensor, remove sensor. Wrap sensor and thermometer with aluminum foil to prevent oil penetration. Place thermometer and sensor in container of oil.
- Connect test light and battery to sensor terminals. See Fig 1 . Heat oil and note temperature in the aluminum foil when the test light activates. Test light should activate when temperature reaches 221-239°F (105-115°C). Replace sensor if not within specification.
CAUTION:
DO NOT
allow oil
temperature to exceed 302°F (150°C).
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.