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DTC MONITORING ITEM MALFUNCTION DETECTION CONDITION TROUBLE AREA DETECTION TIMING DETECTION LOGIC (Canister pump module - ECM) EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose) ECM (ignition switch off) HINT: The canister pressure sensor is built into the canister pump module. DESCRIPTION The description can be found in the EVAP (Evaporative Emission) System
. MONITOR DESCRIPTION DTC P0451: Canister pressure sensor abnormal voltage fluctuation or being constant If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the canister pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC. Alternatively, if the sensor voltage output does not change for 10 seconds, the ECM interprets this as the sensor being stuck, and stops the monitor. The ECM then illuminates the MIL and stores the DTC. (Both the malfunctions are detected by 2 trip detection logic.) 1. DTC P0452: Canister pressure sensor voltage low 2. 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0451-P045... |