Diagnostic Procedure

Verify Related Repair Information Availability - Turn ignition off. Connect scan tool to DLC-2. See Figure. 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.
Verify Related Pending Code Or Stored DTCs - Turn ignition off, then on (engine off). Verify related PENDING CODE or stored DTCs. If no other DTC is present, go to next step. If other DTC related to this DTCis present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
Classify Intermittent Or Continuous Concern - Perform evaporative system leak inspection. See EVAPORATIVE SYSTEM LEAK INSPECTION USING LEAK DETECTOR under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If system test result failed (Red light turns on), go to next step. If system test result passed (Green light turns on), intermittent concern exists. Inspect purge solenoid valve and EVAP system leak detection pump circuit for intermittent concern. See INTERMITTENTS in TROUBLESHOOTING - NO CODES article.
Locate Leak Point - Check for leakage at following using Ultrasonic leak detector:
- Charcoal canister.
- Catch tank.
- Fuel filler cap.
- EVAP hoses and pipes.
- Fuel tank.
If leakage is not present, go to next step. If leakage is present, repair leakage or replace part. After repair, go to step 9.
Inspect Purge Solenoid Valve - Inspect if purge solenoid valve is stuck closed. See FUEL EVAPORATIVE SYSTEM (MIATA & MPV) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If purge solenoid valve is okay, go to next step. If purge solenoid valve is faulty, replace purge solenoid valve. After repair, go to step 9.
Inspect EVAP System Leak Detection Pump - Return vehicle to original condition. Place clamp on EVAP system leak detection pump hose between EVAP system leak detection pump and air filter. Perform evaporative system leak inspection. See EVAPORATIVE SYSTEM LEAK INSPECTION USING LEAK DETECTOR under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If test result passed (Green light turns on), go to next step. If test result failed (Red light turns on), go to step 8.
Confirm EVAP System Leak Detection Pump Leakage - Remove clamp from EVAP system leak detection pump hose. Perform evaporative system leak inspection. See EVAPORATIVE SYSTEM LEAK INSPECTION USING LEAK DETECTOR under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If test result passed, go to next step. If test result failed (Red light turns on), replace EVAP system leak detection pump. After repair, go to step 9.
Inspect Fuel Pump Unit Installation - Remove fuel tank. Visually inspect for damage, insufficient sealing or poorly installed pump unit. If no problem is found, go to next step. If problem is found, repair or replace fuel tank or seal. After repair, go to next step.
Perform Leak Inspection - Return vehicle to original condition. Perform evaporative system leak inspection. See EVAPORATIVE SYSTEM LEAK INSPECTION USING LEAK DETECTOR under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If test result passed (Green light turns on), go to next step. If test result failed (Red light turns on), leakage still exists. Locate leak point and repair as necessary. After repair, go to next step.
Verify After Repair Procedure - Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE. If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.