DTC P2406: EVAP System Leak Detection Pump Sense Circuit Low

Fig 1: DTC P2406 Detection Condition & Possible Causes Chart

Courtesy of MAZDA MOTORS CORP.

Diagnostic Procedure 

Fig 2: DTC P2406 Diagnostic Procedure Chart (Step 1-4)

Courtesy of MAZDA MOTORS CORP.

Fig 3: DTC P2406 Diagnostic Procedure Chart (Step 5)

Courtesy of MAZDA MOTORS CORP.