Protege & Protege5
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 Figure. Remove IAT sensor. Using DVOM, measure resistance between IAT sensor terminals "A" and "B". See IAT SENSOR RESISTANCE SPECIFICATIONS (EXCEPT MPV) table. If resistance readings are as specified, go to next step. If resistance readings are not as specified, replace IAT sensor. - Open Circuit Inspection
Disconnect PCM 104-pin harness connector. Connect 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity between following terminals:- IAT sensor harness connector terminal "A" (Blue/White wire) and breakout box terminal No. 39.
- IAT sensor harness connector terminal "B" (Orange wire) and breakout box terminal No. 91.
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 Blue/White wire between IAT sensor harness connector terminal "A" and PCM 104-pin harness connector terminal No. 39. If continuity is present, repair short circuit to ground in Blue/White wire between IAT sensor harness connector terminal "A" and PCM 104-pin harness connector terminal No. 39 or replace wire harness.