P0453

DTC P0453 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR/SWITCH HIGH INPUT

CIRCUIT DESCRIPTION

DTC Detection Condition:

The fuel tank pressure (FTP) sensor, the evaporative emissions vacuum switching valve ( EVAP VSV), canister closed valve (CCV) and bypass VSV are used to detect abnormalities in the evaporative emission control system.

The ECM decides whether there is an abnormality in the EVAP system, based on the FTP sensor signal.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

The ECM monitors the FTP sensor in two ways. One method examines the fluctuation of the electrical signal while the engine is idling. If the pressure signal varies beyond the specified range, the ECM interprets this
as a noise in the FTP sensor. The ECM also verifies that the pressure signal changes within the specified range. If the output of the sensor does not vary for 10 minutes while the intake air amount has been changing, the ECM interprets this as a fault in the FTP sensor. Either fault will set DTC P0451 and the ECM will turn on the MIL.

Wiring Diagram:

Step 1:

Step 2 - 3:

INSPECTION PROCEDURE

HINT:
- If DTC P0451, P0452 or P0453 is output with DTC P0441, P0442, P0446, P0455, P0456 or P2418, first troubleshoot DTC P0451, P0452 or P0453. If no malfunction is detected, troubleshoot DTC P0441, P0442, P0446, P0455, P0456 or P2418 next.
- Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
- When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the fuel tank pressure (FTP) sensor.

CHECK FOR INTERMITTENT PROBLEMS

HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the hand-held tester is in check mode. In check mode, the hand-held tester uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic.

a. Clear the DTCs.
b. Set the check mode.
c. Perform a simulation test.
d. Check the connector and terminal.
e. Wiggle the harness and the connector.