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.
1996 Mazda MX-5 Miata Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Sensor Operating Range Charts: Introduction
Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a diagnostic trouble code, but it may cause driveability problems.
NOTE:
Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
CAMSHAFT POSITION (CMP) SENSOR VOLTAGE
| ECM Terminal (1) | (2) Voltage | ||||
|---|---|---|---|---|---|
| SGT Signal | 5 (4 pulses/rev) | ||||
| SGC Signal | 5 (2 pulses/rev) | ||||
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CRANKSHAFT POSITION (CKP) SENSOR RESISTANCE
| Terminals (1) | Temperature | Ohms | ||
|---|---|---|---|---|
| "A" & "B" | 68°F (20°C) | 500-600 | ||
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ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE
| Temperature | Ohms |
|---|---|
| 68°F (20°C) | 2200-2700 |
| 176°F (80°C) | 287-349 |
EGR BOOST SENSOR VOLTAGE
| Vacuum | Voltage |
|---|---|
| 29.9 in. Hg | 4.0 |
EGR VALVE POSITION SENSOR VOLTAGE
| Vacuum | Voltage |
|---|---|
| 0 in. Hg | 0.8 |
| 5.04 in. Hg | 4.9 |
HEATED OXYGEN SENSOR
| Operating Condition | Volts |
|---|---|
| Acceleration | 0.5-1.0 |
| Deceleration | 0.0-0.5 |
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE
| Temperature | (1) Ohms | ||
|---|---|---|---|
| 68°F (20°C) | 2200-2700 | ||
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MASS AIRFLOW (MAF) SENSOR VOLTAGE
| Terminal (1) | Ignition On Volts | Engine Running Volts | ||
|---|---|---|---|---|
| "A" (Power Supply) | 12.0 | 12.0 | ||
| "B" (Signal) | 0.5-1.0 | 1.0-2.0 | ||
| "D" (Ground) | 0 | 0 | ||
| "E" (Ground) | 0 | 0 | ||
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TP SENSOR VOLTAGE
| ECM/PCM Wire Color | Closed Throttle Volts | WOT Volts | |||
|---|---|---|---|---|---|
| Miata | |||||
| Red/Black (3F) (1) | 0.1-1.1 | 3.1-4.5 | |||
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THROTTLE POSITION (TP) SENSOR CONTINUITY
| Condition (1) | Continuity Between Terminals "A" & "B" | ||
|---|---|---|---|
| .012" (.3 mm) | Yes | ||
| .016" (.4 mm) | No | ||
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Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.