Using scan tool, check RFCFLAG PID status. If RFCFLAG PID is OFF, perform Mode 1 - PCM Adaptive Memory Produce Drive Mode first. See MODE 1 - PCM ADAPTIVE MEMORY PRODUCE DRIVE MODE . If RFCFLAG PID is ON, go to next step.
Start engine and warm up to normal operating temperature. Ensure all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.
Drive vehicle as shown in graph. See Fig 1. Stop vehicle and access ON BOARD SYSTEM READINESS menu of GENERIC OBD II FUNCTION to check Drive Mode completion status. If completed, Readiness Function Check (RFC) flag should change from NO to YES. Go to next step. If test is not complete, turn ignition off and repeat this step.
Access DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to inspect monitor results. If results are okay (MEAS are within specification), ensure no DTCs are present. If no DTCs are present, repairs are complete. If results are not okay (MEAS are not within specification), repairs are not complete.

Fig 1: Identifying Mode 2 - EGR System Repair Verification Drive Mode, Vehicle Speed

Courtesy of MAZDA MOTORS CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Mode 2 - EGR System Repair Verification Drive Mode