Diagnosis & Repair Procedure
- Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step 8.
- Turn ignition switch off then start engine. Using scan tool, check for DTCs. If DTC P1487 is not present, go to next step. If DTC P1487 is present, diagnose and repair as necessary. See DTC P1487: EGR BOOST SENSOR SOLENOID VALVE CIRCUIT MALFUNCTION .
- Check for DTCs in FREEZE FRAME data. If DTC P0106 is present, go to next step. If DTC P0106 is not present, go to TROUBLE SHOOTING - NO CODES
article.
- Check for loose, damaged, misrouted or plugged vacuum hoses between EGR boost sensor and EGR boost sensor solenoid valve, and between EGR boost sensor solenoid valve and intake manifold. If vacuum hoses are okay, go to next step. If any problem is present, repair or replace as necessary and go to step 8.
- Check for plugged EGR boost sensor air filter. Repair or replace as necessary and go to step 8. If EGR boost sensor air filter is okay, go to next step.
- Check EGR boost sensor solenoid valve operation . See EMISSION SYSTEMS & SUB-SYSTEMS
in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. Replace as necessary and go to next step. If EGR boost sensor solenoid valve operates correctly, go to next step. If EGR boost sensor solenoid valve does not operate correctly, replace EGR boost sensor solenoid valve. Go to step 8.
- Check EGR boost sensor operation. See EMISSION SYSTEMS & SUB-SYSTEMS
in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. Replace as necessary and go to next step. If EGR boost sensor is okay, go to next step.
- Reconnect all connectors. Turn ignition switch on. Clear DTC from memory. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Perform Drive Mode 1: PCM adaptive memory, Drive Mode 2: EGR monitor repair verification and Drive Mode 3: HO2S/TWC monitor repair verification. See DRIVE MODES under SELF-DIAGNOSTIC SYSTEM. Recheck for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0106 is still present, replace PCM. If DTC P0106 is not present, go to next step.
- Cycle ignition switch from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
Courtesy of MAZDA MOTORS CORP.