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.
Connector Identification
Harness connector terminal identification illustrations are generic and categorized by number of terminals. For terminal identification of connectors with 1 or 2 terminals, see WIRING DIAGRAMS article. All connector views are terminal side unless otherwise specified. For harness connector terminal identification, see HARNESS CONNECTOR IDENTIFICATION DIRECTORY table.
| Description | See Fig. | |||||||
|---|---|---|---|---|---|---|---|---|
| Miata | ||||||||
| Camshaft Position Sensor | Fig 2 | |||||||
| Crankshaft Position Sensor | Fig 1 | |||||||
| EGR Boost Sensor | Fig 2 | |||||||
| EGR Valve | Fig 8 | |||||||
| Engine Coolant Temperature Sensor | Fig 3 | |||||||
| Fuel Pump | Fig 5 | |||||||
| Fuel Pump Relay (1) | Fig 8 | |||||||
| Fuel Tank Pressure Sensor | Fig 2 | |||||||
| Front Heated Oxygen Sensor | Fig 5 | |||||||
| Ignition Coils (1) | Fig 6 | |||||||
| Mass Air Flow Sensor | Fig 2 | |||||||
| Powertrain Control Module (1) | Fig 13 | |||||||
| Rear Heated Oxygen Sensor (2) | Fig 5 | |||||||
| Rear Heated Oxygen Sensor (3) | Fig 4 | |||||||
| Throttle Position Sensor | Fig 2 | |||||||
| Millenia (2.3L) | ||||||||
| Camshaft Position Sensor (1) | Fig 6 | |||||||
| Crankshaft Position Sensor | Fig 2 | |||||||
| EGR Valve Position Sensor | Fig 2 | |||||||
| Fuel Tank Pressure Sensor | Fig 2 | |||||||
| Ignition Coils | Fig 6 | |||||||
| Left Front Heated Oxygen Sensor | Fig 2 | |||||||
| Left Rear Heated Oxygen Sensor | Fig 5 | |||||||
| Manifold Absolute Pressure Sensor | Fig 2 | |||||||
| Mass Air Flow Sensor | Fig 2 | |||||||
| Powertrain Control Module (1) | Fig 14 | |||||||
| Right Front Heated Oxygen Sensor | Fig 1 | |||||||
| Right Rear Heated Oxygen Sensor | Fig 5 | |||||||
| Throttle Position Sensor | Fig 6 | |||||||
| Transmission Control Module | Fig 16 | |||||||
| Millenia (2.5L) | ||||||||
| Crankshaft Position Sensor | Fig 2 | |||||||
| Distributor | Fig 12 | |||||||
| EGR Boost Sensor | Fig 2 | |||||||
| EGR Valve Position Sensor | Fig 2 | |||||||
| Fuel Tank Pressure Sensor | Fig 2 | |||||||
| Left Front Heated Oxygen Sensor | Fig 5 | |||||||
| Left Rear Heated Oxygen Sensor | Fig 4 | |||||||
| Mass Air Flow Sensor | Fig 2 | |||||||
| Powertrain Control Module (1) | Fig 14 | |||||||
| Right Front Heated Oxygen Sensor | Fig 5 | |||||||
| Right Rear Heated Oxygen Sensor | Fig 4 | |||||||
| MPV | ||||||||
| EGR Boost Sensor | Fig 2 | |||||||
| EGR Valve | Fig 8 | |||||||
| Fuel Pump | Fig 5 | |||||||
| Fuel Tank Pressure Sensor | Fig 2 | |||||||
| IMRC Actuator | Fig 9 | |||||||
| Left Front Heated Oxygen Sensor | Fig 5 | |||||||
| Left Rear Heated Oxygen Sensor (2) | Fig 4 | |||||||
| Mass Air Flow Sensor | Fig 10 | |||||||
| Middle Heated Oxygen Sensor (3) | Fig 4 | |||||||
| Powertrain Control Module (1) | Fig 15 | |||||||
| Right Front Heated Oxygen Sensor | Fig 5 | |||||||
| Right Rear Heated Oxygen Sensor (2) | Fig 5 | |||||||
| Rear Heated Oxygen Sensor (3) | Fig 5 | |||||||
| Throttle Position Sensor | Fig 1 | |||||||
| Protege | ||||||||
| Crankshaft Position Sensor | Fig 2 | |||||||
| EGR Boost Sensor (2) | Fig 2 | |||||||
| EGR Valve (2) | Fig 8 | |||||||
| Fuel Pump | Fig 5 | |||||||
| Fuel Tank Pressure Sensor | Fig 2 | |||||||
| Front Heated Oxygen Sensor | Fig 4 | |||||||
| Ignition Coils | Fig 1 | |||||||
| Mass Air Flow Sensor (1.6L) | Fig 7 | |||||||
| Mass Air Flow Sensor (1.8L) | Fig 2 | |||||||
| Powertrain Control Module (1) | Fig 15 | |||||||
| Rear Heated Oxygen Sensor | Fig 4 | |||||||
| Throttle Position Sensor | Fig 2 | |||||||
|
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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.
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