MAZDA6 (3.0L)
- Resistance Inspection
Disconnect Knock Sensor (KS) 2-pin harness connector. Using ohmmeter, measure resistance between KS terminals "A" and "B". Resistance should be about 4.87 megohms at 68°F (20°C). If KS resistance reading is within specification, check for open or short circuit. Go to next step. If resistance reading is not as specified, replace KS. - Open Circuit Inspection
Disconnect PCM 104-pin harness connector. Check for continuity between following terminals:- KS harness connector terminal "A" (Green wire) and PCM 104-pin harness connector terminal No. 4.
- KS harness connector terminal "B" (Red wire) and PCM 104-pin harness connector terminal No. 31.
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 between following:- KS harness connector terminal "A" (Green wire) and power supply.
- KS harness connector terminal "B" (Red wire) and ground.
- KS harness connector terminal "A" (Green wire) and ground.
- KS harness connector terminal "B" (Red wire) and power supply.
If continuity is present, repair short circuit in suspect wire or replace wire harness.