P0450
3MZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0450: Evaporative Emission Control System Pressure Sensor / Switch
DTC P0450 - Evaporative Emission Control System Pressure Sensor / Switch
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 pressure sensor is built into the pump module.
DESCRIPTION
Refer to the EVAP system EVAP System.
MONITOR DESCRIPTION
1 DTC P0450: Pressure sensor abnormal voltage fluctuation
If the pressure sensor output voltage rapidly fluctuates between less than 0.45 V and more than 4.9 V, the ECM (Included in HV control ECU) interprets this as an open or short circuit in the pressure sensor or its circuit, and stops the EVAP (Evaporative Emission) system monitor. The ECM (included in the HV control ECU) then illuminates the MIL and sets the DTC (1 trip detection logic).
2 DTC P0451: Pressure sensor abnormal voltage fluctuation or being constant
If the pressure sensor output voltage fluctuates rapidly for 10 seconds, the ECM (included in the HV control ECU) stops the EVAP system monitor. The ECM interprets this as the pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC.
Alternatively, if the sensor output voltage does not change for 10 seconds, the ECM interprets this as the sensor voltage being constant, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.
(Both the malfunctions are detected by 2 trip detection logic).
3 DTC P0452: Pressure sensor voltage low
If the pressure sensor output voltage is below 0.45 V, the ECM (included in the HV control ECU) interprets this as an open or short circuit in the 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: Pressure sensor voltage high
If the pressure sensor voltage output is 4.9 V or more, the ECM (included in the HV control ECU) interprets this as an open or short circuit in the 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
P0451 (Noise Monitor):
Example of restart time
P0451 (Stuck Monitor):
Example of restart time
P0450, P0452 and P0453:
TYPICAL MALFUNCTION THRESHOLDS
1. P0450: Pressure sensor chattering
2. P0451: Pressure sensor noise
3. P0451: Pressure sensor stuck
4. P0452: Pressure sensor low voltage
5. P0453: Pressure sensor high voltage
WIRING DIAGRAM
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 pump module.
- The Techstream is required to conduct the following diagnostic troubleshooting procedure.
PROCEDURE
1. CONFIRM DTC AND EVAP PRESSURE
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
(e) Read the DTCs.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Pump.
(g) Read the EVAP (Evaporative Emission) pressure displayed on the tester.
Result:
C -- GO TO EVAP INSPECTION PROCEDURE
B -- CHECK HARNESS AND CONNECTOR (PUMP MODULE - HV CONTROL ECU)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (PUMP MODULE - HV CONTROL ECU)
(a) Turn the ignition switch OFF.
(b) Disconnect the H30 HV control ECU connector.
(c) Measure the resistance between the PPMP terminal of the HV control ECU connector and body ground.
Result:
(d) Reconnect the HV control ECU connector.
B -- REPLACE HV CONTROL ECU
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (PUMP MODULE - HV CONTROL ECU)
(a) Disconnect the L5 canister pump module connector.
(b) Disconnect the H30 HV control ECU connector.
(c) Measure the resistance between the PPMP terminal of the HV control ECU connector and body ground.
Result:
(d) Reconnect the canister pump module connector.
(e) Reconnect the HV control ECU connector.
B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE CHARCOAL CANISTER
4. CHECK HARNESS AND CONNECTOR (PUMP MODULE - HV CONTROL ECU)
(a) Disconnect the L5 canister pump module connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage and resistance according to the value(s) in the table below.
Standard:
Result:
(d) Reconnect the canister pump module connector.
B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE CHARCOAL CANISTER
5. REPLACE CHARCOAL CANISTER
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
6. REPAIR OR REPLACE HARNESS OR CONNECTOR
HINT: If the exhaust tail pipe has been removed, go to the next step before reinstalling it.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
7. REPLACE HV CONTROL ECU
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position 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