P0450
2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0450: Evaporative Emission Control System Pressure Sensor Malfunction
DTC P0450 - Evaporative Emission Control System Pressure Sensor Malfunction
DTC P0451 - Evaporative Emission Control System Pressure Sensor Range / Performance
DTC P0452 - Evaporative Emission Control System Pressure Sensor / Switch Low Input
DTC P0453 - Evaporative Emission Control System Pressure Sensor / Switch High Input
DTC SUMMARY
HINT: The Canister pressure sensor is built into the canister pump module.
DESCRIPTION
The circuit description can be found in the EVAP System EVAP System.
MONITOR DESCRIPTION
1 DTC P0450: Canister pressure sensor output abnormal fluctuation
If the canister pressure sensor output rapidly fluctuates between less than 42.1 kPa and more than 123.8 kPa, the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
2 DTC P0451: Canister pressure sensor noise or stuck
If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as noise from the canister pressure sensor, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC.
Alternatively, if the sensor voltage output does not change, the ECM interprets this as the sensor being stuck, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.
(Both of the malfunctions are detected by 2 trip detection logic).
3 DTC P0452: Canister pressure sensor voltage low
If the canister pressure sensor output is below 42.1 kPa, the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
4 DTC P0453: Canister pressure sensor voltage high
If the canister pressure sensor output is 123.8 kPa or more, the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Canister pressure sensor noise:
Canister pressure sensor stuck:
Canister pressure sensor chattering, low/high voltage:
TYPICAL MALFUNCTION THRESHOLDS
Canister pressure sensor noise:
Canister pressure sensor stuck:
Canister pressure sensor chattering:
Canister pressure sensor low pressure:
Canister pressure sensor high pressure:
WIRING DIAGRAM
Refer to EVAP System EVAP System.
INSPECTION PROCEDURE
NOTICE:
- When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel tank cap.
- Do not disassemble the canister pump module.
- The Techstream is required to conduct the following diagnostic troubleshooting procedure.
PROCEDURE
1. CONFIRM DTC AND EVAP PRESSURE
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read the values.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / Evaporative / Vapor Pressure Pump.
(f) Read the EVAP pressure displayed on the tester.
Result:
C -- CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
A -- GO TO EVAP SYSTEM
B -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
(a) Disconnect the E9 ECM connector.
(b) Turn the ignition switch OFF.
(c) Measure the resistance of the wire harness side connectors.
Result:
(d) Reconnect the ECM connector.
B -- REPLACE ECM
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
(a) Disconnect the L4 canister connector.
(b) Disconnect the E9 ECM connector.
(c) Measure the resistance of the wire harness side connectors.
Result:
(d) Reconnect the canister connector.
(e) Reconnect the ECM connector.
B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE CHARCOAL CANISTER ASSEMBLY
4. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
(a) Disconnect the L4 canister connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage of the canister pump module connector.
Standard voltage:
(d) Measure the resistance of the canister pump module connector.
Standard resistance:
Result:
(e) Connect the canister connector.
B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- Continue to next step.
5. REPLACE CHARCOAL CANISTER ASSEMBLY
(a) Replace the charcoal canister assembly Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
6. REPAIR OR REPLACE HARNESS OR CONNECTOR
HINT: If the exhaust tailpipe has been removed, go to the next step before reinstalling it.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
7. REPLACE ECM
(a) Replace the ECM Removal.
NEXT -- Continue to next step.
8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Wait for at least 60 seconds.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
HINT: If no pending DTC is displayed on the tester, the repair has been successfully completed.
NEXT -- COMPLETED