EGR Boost Sensor - MAZDA6 (3.0L)

Voltage Inspection

Connect scan tool to DLC-2. Turn ignition on, engine off. Select BARO PID on scan tool. Verify BARO PID (pressure) and barometric pressure are practically equal. If as verified, go to next step. If not as verified, go to step 3.
Apply -7.38 in. Hg to EGR boost sensor and ensure BARO PID variation from step 1 is about 7.38 in. Hg. If not as verified, go to next step. If as verified, replace EGR boost sensor.

Open Circuit Inspection

Check for continuity between following terminals:
- EGR boost sensor 3-pin harness connector terminal "A" and PCM 104-pin harness connector terminal No. 34 (Pink wire).
- EGR boost sensor 3-pin harness connector terminal "B" and PCM 104-pin harness connector terminal No. 91 (Brown wire).
- EGR boost sensor 3-pin harness connector terminal "C" and PCM 104-pin harness connector terminal No. 90 (Red/Black 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 between following:
- EGR boost sensor 3-pin harness connector terminal "A" (Pink wire) and power supply.
- EGR boost sensor 3-pin harness connector terminal "A" (Pink wire) and ground.
- EGR boost sensor 3-pin harness connector terminal "B" (Brown wire) and power supply.
- EGR boost sensor 3-pin harness connector terminal "C" (Red/Black wire) and power supply.
- EGR boost sensor 3-pin harness connector terminal "C" (Red/Black wire) and ground.
If continuity is present, repair short circuit in suspect wire or replace wire harness.