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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 63 (ENGINE CONTROLS [SYSTEM & COMPONENT TESTING])ENGINE SENSORS & SWITCHESINTAKE AIR TEMPERATURE SENSORMIATA
1999 Mazda 626 ES, 2.5 D, Standard
Intake Air Temperature Sensor: Miata
1999 Mazda 626 ES, 2.5 D, StandardSECTION Miata
WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Resistance Inspection
Disconnect Intake Air Temperature (IAT) sensor 2-pin harness connector. See Fig 1. Remove IAT sensor. Using DVOM, measure resistance between IAT sensor connector terminals "A" and "B". See IAT SENSOR RESISTANCE SPECIFICATIONS (EXCEPT MAZDA6 & MPV) table. If resistance readings are as specified, check for open or short circuit. Go to next step. If resistance readings are not as specified, replace IAT sensor. - Open Circuit Inspection
Check for continuity between following terminals:- IAT sensor harness connector terminal "B" and PCM 31-pin harness connector terminal No. 4N (Pink/Blue wire).
- IAT sensor harness connector terminal "A" and PCM 31-pin harness connector terminal No. 4O (Black/Red wire).
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.
- Short Circuit Inspection
Check for continuity to ground in Pink/Blue wire between IAT sensor harness connector terminal "B" and PCM 31-pin harness connector terminal No. 4N. If continuity is present, repair short circuit to ground in Pink/Blue wire between IAT sensor harness connector terminal "B" and PCM 31-pin harness connector terminal No. 4N.
IAT SENSOR RESISTANCE SPECIFICATIONS (EXCEPT MAZDA6 & MPV)
| Temperature - °F (°C) | Ohms | |
|---|---|---|
| Miata | ||
| 68 (20) | 2210-2690 | |
| 176 (80) | 290-354 | |
| Protege & Protege5 | ||
| 68 (20) | 2000-2900 | |
| 176 (80) | 270-370 | |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.