P2418
DTC P2418 Evaporative Emission System Valve Control Circuit/OpenCIRCUIT DESCRIPTION
DTC Detecting Condition:
The vapor pressure sensor, canister closed valve (CCV), and pressure switching valve are used to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal.
DTCs P0441, P0446 and P2418 are recorded by the ECM when evaporative emissions leak from the components within the dotted line as shown in figure, or when there is a malfunction in either the EVAP VSV, the pressure switching valve, or in the vapor pressure sensor itself.
HINT: Typical DTC output of each trouble part
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions:
Typical Malfunction Thresholds:
Monitor Result (Mode 06 Data):
P2418
a. pressure switching valve stuck open.
The ECM checks for a pressure switching valve "stuck open" malfunction by commanding the pressure switching valve to close after an EVAP leak test. If the fuel tank pressure does not change, the ECM determines that the pressure switching valve is malfunctioning. The ECM will turn on the MIL and a DTC is set.
And when EVAP VSV stuck closed malfunction is detected, the ECM also stores this DTC (P2418).
b. When EVAP VSV (Purge line to intake manifold) stuck closed is detected, the pressure switching valve malfunction DTC is also stored.
Wiring Diagram:
INSPECTION PROCEDURE
HINT:
- If DTC P0441 (Purge Flow), P0446 (CCV) or P2418 (Pressure Switching Valve) or P0451 (Evaporative Pressure Sensor) is output with DTC P0442, P0455 or P0456, first troubleshoot DTC P0441, P0446 or P0451. If no malfunction is detected, troubleshoot DTC P0442, P0455 or P0456 next.
- Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.
- When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.
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Hand-held tester
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OBD II scan tool (excluding hand-held tester)