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.
1994 Mazda Protege DX, StandardFACTORY 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 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.
AIRFLOW MTR TERM RESISTANCE
| Terminals (1) | Fully Closed: Ohms | Fully Open: Ohms | |||||||
|---|---|---|---|---|---|---|---|---|---|
| E2 & Vs | (2) 200-600 | 20-1000 | |||||||
| E2 & Vc | 200-400 | 200-400 | |||||||
| E2 & THAa (3) | |||||||||
| -4°F (-20°C) | 13,600-18,400 | 13,600-18,400 | |||||||
| 68°F (20°C) | 2210-2690 | 2100-2690 | |||||||
| 140°F (60°C) | 493-667 | 493-667 | |||||||
| E1 & Fc | Infinite | 0 | |||||||
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AIRFLOW MTR TERM RESISTANCE
| Terminals (1) | Temperature | Ohms | |||||||
|---|---|---|---|---|---|---|---|---|---|
| E2 & Vs | |||||||||
| Closed | 68°F (20°C) | 20-600 | |||||||
| Open | 68°F (20°C) | 20-1000 | |||||||
| E2 & Vc (2) | 68°F (20°C) | 200-400 | |||||||
| E2 & THA (3) | -4°F (-20°C) | 10,000-20,000 | |||||||
| 68°F (20°C) | 2000-3000 | ||||||||
| 140°F (60°C) | 400-700 | ||||||||
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ECT SENSOR RESISTANCE
| Temperature | Ohms |
|---|---|
| -4°F (-20°C) | 14,600-17,800 |
| 68°F (20°C) | 2200-2700 |
| 104°F (40°C) | 1000-1300 |
| 140°F (60°C) | 500-650 |
| 176°F (80°C) | 290-350 |
EGR POSITION SENSOR RESISTANCE
| Terminals | Ohms | ||
|---|---|---|---|
| MX-3 DOHC | |||
| "A" & "B" | |||
| Zero in. Hg | 2300 | ||
| 6 in. Hg | 5800 | ||
| "A" & "C" | |||
| Zero in. Hg | 5300 | ||
| 6 in. Hg | 1200 | ||
| "B" & "C" | 5000 | ||
| MX-6 2.5L & 626 2.5L | |||
| "A" & "B" | 5000 | ||
| "A" & "C" | 700-5000 | ||
| "B" & "C" | 700-5000 | ||
OXYGEN SENSOR
| Operating Condition | Voltage |
|---|---|
| Rapidly Accelerating | 0.5-1.0 |
| Deceleration | 0.0-0.4 |
TP SENS CONTINUITY (MX-3 - 1.6L A/T & 1.8L, PROTEGE A/T, 323 A/T)
| Test Condition (1) | (2) Continuity | |||||
|---|---|---|---|---|---|---|
| MX-3 1.8L | ||||||
| .006" (.15 mm) | Yes | |||||
| .020" (.50 mm) | No | |||||
| All Others | ||||||
| .004" (.10 mm) | Yes | |||||
| .024" (.60 mm) | No | |||||
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TP SENSOR CONTINUITY
| Test Condition | Continuity Between IDL & TL/E | Continuity Between POW & TL/E | ||
|---|---|---|---|---|
| .004" (.10 mm) (1) | Yes | No | ||
| .039" (1.0 mm) (1) | No | No | ||
| WOT | No | Yes | ||
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Factory Service Tools
Use the Manual With the Right Hardware
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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.