MAZDA6 (2.3L)
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.
- Connected scan tool to DLC-2. Turn ignition on, engine off. Select MAP PID. Verify MAP PID and barometric pressure are practically equal. If as verified, go to next step. If not as verified, check for open or short circuit. Go to step 3.
- Apply vacuum of -7.38 in. Hg to MAP sensor, and verify MAP variation from that of step 1 is about 7.38 in. Hg. If not as verified, check for open or short circuit. Go to next step.
- Open Circuit Inspection
Disconnect Manifold Absolute Pressure (MAP) sensor 4-pin harness connector. See Fig 1. Disconnect PCM harness connectors. Check for continuity between following terminals:- MAP sensor 4-pin harness connector terminal "A" and PCM 30-pin harness connector terminal No. 2H (Brown wire).
- MAP sensor 4-pin harness connector terminal "C" and PCM 30-pin harness connector terminal No. 2K (Red/Black wire).
- MAP sensor 4-pin harness connector terminal "D" and PCM 30-pin harness connector terminal No. 1J (Yellow/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:- MAP sensor 4-pin harness connector terminal "C" (Red/Black wire) and power supply.
- MAP sensor 4-pin harness connector terminal "C" (Red/Black wire) and ground.
- MAP sensor 4-pin harness connector terminal "D" (Yellow/Black wire) and power supply.
- MAP sensor 4-pin harness connector terminal "D" (Yellow/Black wire) and ground.
If continuity is present, repair short circuit to ground in suspect wire or replace wire harness. If open or short circuit is not present, replace MAP sensor.