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EC-312 < DTC/CIRCUIT DIAGNOSIS > [MRA8DE] P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR 3. Install a vacuum pump to EVAP control system pressure sensor. 4. Turn ignition switch ON and check output voltage between ECM harness connector and ground under the following conditions. CAUTION: • Always calibrate the vacuum pump gauge when using it. 2 , -13.53 psi) or pressure over 101.3 kPa (1.033 kg/ cm 2 , 14.69 psi). Is the inspection result normal? YES >> INSPECTION END NO >> Replace EVAP control system pressure sensor. Refer to FL-15, "Removal and Installation" . ECM Condition [Applied vacuum kPa (kg/cm 2 , psi)] Voltage Connector + − Terminal E16 114 124 Not applied 0.5 - 4.6 V -26.7 (-0.272, -3.87) 2.1 to 2.5 V lower than above value |