Advanced Diagnostics

Advanced Diagnostics

DTC P2422: Evaporative Emission (EVAP) Canister Vent Shut Valve Stuck Closed Malfunction (Engine Type: R18A1)






General Description
The fuel tank pressure (FTP) sensor output is near atmospheric pressure (0 kPa (0 in.Hg, 0 mmHg)) before purge starts since the evaporative emission (EVAP) canister vent shut valve is normally open (to the atmosphere). The sensor indicates a negative pressure value (vacuum) while purging. When the FTP sensor indicates vacuum after the engine starts, an FTP sensor zero point shift failure or an EVAP canister vent shut valve stuck closed can occur. To prevent these failures, the Engine control module (ECM)/powertrain control module (PCM) monitors the FTP sensor output after purge starts. The ECM/ PCM detects a malfunction of the EVAP canister vent shut valve if the output indicates excessive vacuum. However, if the fuel tank internal pressure is below the specified value (excessive vacuum is detected) when starting the engine, the malfunction detection should be done as follows because it is difficult to distinguish between FTP sensor range problem (P1454) and an EVAP canister vent shut valve stuck closed problem (P2422). 1. If neither Temporary DTC (P1454 nor P2422) is stored, both DTCs are stored. 2. If both Temporary DTCs (P1454 and P2422) are stored and excessive vacuum is detected, both DTCs are stored. 3. If either Temporary DTC (P1454 or P2422) is stored and excessive vacuum is detected, the ECM/PCM stores the Temporary DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
The output from the fuel tank pressure sensor is -4 kPa (-1.0 in.Hg, -25 mmHg)*, -1 kPa (-0.3 in.Hg, -10 mmHg)** or less for at least 1.04*, 8** seconds.

Driving Pattern

1. Start the engine, and let it idle until the radiator fan comes on.
2. When the diagnosis does not finish at idle, drive at 30 - 75 mph (48 - 120 km/h) at EVAP canister purge valve duty 20 % or more.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the ECM/PCM memory. If the malfunction recurs during the next (second) drive cycle, the MIL comes on and the DTC and the freeze frame data are stored.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs. The MIL, the DTC, the Temporary DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.