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Duration Within 15 seconds: P0451 sensor noise Within 2 minutes: P0451 sensor fixed/flat 0.5 seconds: P0452 and P0453 MIL Operation Immediate: P0452 and P0453 2 driving cycles: P0451 TYPICAL ENABLING CONDITIONS P0451 (Noise Monitor) Monitor runs whenever following DTCs not present P0452, P0453 (EVAP system) Atmospheric pressure (absolute pressure) 70 to 111 kPa-a (525 to 833 mmHg-a) Battery voltage 10.5 V or higher Intake air temperature 4.4 to 40°C (40 to 104°F) A. Engine condition Running B. Time after key off 5, 7 or 9.5 hours P0451 (Fixed/Flat Monitor) Monitor runs whenever following DTCs not present P0452, 0453 (EVAP system) Battery voltage 10.5 V or higher Intake air temperature 4.4 to 40°C (40 to 104°F) Atmospheric pressure (absolute pressure) 70 to 111 kPa-a (525 to 833 mmHg-a) Time after key off 5, 7 or 9.5 hours P0452 and P0453 Monitor runs whenever following DTCs not present None Battery voltage 8 V or higher Starter OFF (a) Ignition switch ON (b) Soak timer ON TYPICAL MALFUNCTION THRESHOLDS P0451: Canister Pressure Sensor Noise Frequency that EVAP pressure changes 0.3 kPa-g (2.25 mmHg-g) or higher 10 times or more in 10 seconds P0451: Canister Pressure Sensor Voltage Fixed EVAP pressure change during reference pressure measurement Below 0.65 kPa-a (4.87 mmHg-a) 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0451-P0453;... |