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 Knock Sensor (KS) 2-pin harness connector. Using DVOM, measure resistance between KS terminals "A" and "B". Resistance should be about 560,000 ohms at 68°F (20°C). If resistance reading is as specified, go to next step. If resistance is not as specified, replace KS. - Open Circuit Inspection
Disconnect PCM 104-pin harness connector and install 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity between following terminals:- KS harness connector terminal "A" (Yellow/Blue wire) and breakout box terminal No. 57.
- KS harness connector terminal "B" (Red wire) and breakout box terminal No. 59.
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 between following terminals:- KS harness connector terminal "A" (Yellow/Blue wire) and breakout box terminal No. 57
- KS harness connector terminal "B" (Red wire) and breakout box terminal No. 59.
If continuity is present, repair short circuit to ground in suspect wire or replace wire harness.