Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
Verify Related Repair Information Availability - Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
Inspect Connection Of BARO Sensor Connector - Turn ignition off. Verify BARO sensor 3-pin harness connector is connected securely. If connector connection is okay, go to next step. If connector is loose, reconnect connector securely. After repair, go to step 9.
Inspect BARO Sensor Connector For Poor Connection - Disconnect BARO sensor 3-pin harness connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step 9.
Inspect BARO Sensor Malfunction - Perform BARO sensor inspection. Refer to BAROMETRIC PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If BARO sensor is okay, go to next step. If BARO sensor is faulty, replace BARO sensor. After repair, go to step 9.
Verify BARO Sensor Signal Circuit For Short To Constant Voltage Circuit - Measure voltage between BARO sensor 3-pin harness connector terminal "A" (Pink wire) and body ground. See Figure. If voltage reading is not more than 4.43 volts, go to next step. If voltage reading is more than 4.43 volts, repair short to constant voltage circuit in Pink wire between BARO sensor 3-pin harness connector terminal "A" and PCM 30-pin harness connector terminal "1G" or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step 9.
Inspect PCM Connector For Poor Connection - Disconnect PCM harness connectors. Inspect for poor connection at PCM 30-pin harness connector terminal "2H" (such as damaged, pulled-out pins, corrosion). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to next step.
Verify BARO Sensor Ground Circuit For Open Circuit - Check for continuity at following terminals:
- Between BARO sensor 3-pin harness connector terminal "A" and PCM 30-pin harness connector terminal "1G" (Pink wire)
- Between BARO sensor 3-pin harness connector terminal "B" and PCM 30-pin harness connector terminal "2H" (Brown wire)
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspected wire or replace wire harness. After repair, go to next step.
Verify Trouble Shooting Of DTC P2229 Is Completed - Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm up completely. If same DTC is not present, go to next step. If same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
Verify After Repair Procedure - Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.