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P0450








1ZZ-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 canister pressure sensor is built into the canister pump module.

DESCRIPTION

The circuit description can be found in the EVAP (Evaporative Emission) System (Component Tests and General Diagnostics).

MONITOR DESCRIPTION





1 DTC P0450: Canister pressure sensor voltage abnormal fluctuation
If the canister pressure sensor voltage output [pressure] rapidly fluctuates between less than 0.45 V [42.1 kPa-a (315.9 mmHg-a)] and more than 4.9 V [123.8 kPa-a (928.4 mmHg-a)], the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP (Evaporative Emission) system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
2 DTC P0451: Canister pressure sensor noise or fixed/flat
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 for 10 seconds, the ECM interprets this as the sensor being fixed/flat, 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: Canister pressure sensor voltage low
If the canister pressure sensor voltage output [pressure] is below 0.45 V [42.1 kPa-a (315.9 mmHg-a)], 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 voltage output [pressure] is 4.9 V [123.8 kPa-a (928.4 mmHg-a)] 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).

OBD II MONITOR SPECIFICATIONS

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0451 (Noise monitor):





P0451 (Stuck monitor):





P0450, P0452 and P0453:





TYPICAL MALFUNCTION THRESHOLDS

1. P0450: Pressure sensor





2. P0451: Pressure sensor noise





3. P0451: Pressure sensor stuck





4. P0452: Pressure sensor low





5. P0453: Pressure sensor high





6. 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.
- 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 (do not start the engine).
(c) Turn the tester on.
(d) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(e) Read DTCs.
(f) Select the following menu items: 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 SYSTEM
B -- CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)





(a) Turn the ignition switch OFF.
(b) Disconnect the E6 ECM connector.
(c) Measure the resistance between PPMP terminal of the ECM connector and the body ground.
Result:





(d) Reconnect the ECM connector.
B -- REPLACE ECM
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)





(a) Disconnect the L5 canister pump module connector.
(b) Disconnect the E6 ECM connector.
(c) Check the resistance between PPMP terminal of the ECM connector and the body ground.
Result:





(d) Reconnect the canister pump module connector.
(e) Reconnect the ECM connector.
B -- REPAIR OR REPLACE WIRE HARNESS AND CONNECTORS
A -- Continue to next step.
4. REPLACE CHARCOAL CANISTER ASSEMBLY
(a) Replace the charcoal canister assembly.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch to the ON position and turn the tester on.
(d) Wait for at least 60 seconds.
(e) On the tester, select the following menu items: Powertrain / Engine and ECT / Trouble Codes.

HINT: If no pending DTC is displayed on the tester, the repair has been successfully completed.

NEXT -- COMPLETED
5. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)





(a) Turn the ignition switch OFF.
(b) Disconnect the L5 canister pump module connector.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage and resistance of the L5 connector.
Standard:





Result:





(e) Reconnect the canister pump module connector.
B -- REPAIR OR REPLACE WIRE HARNESS AND CONNECTORS
A -- Continue to next step.
6. REPLACE CHARCOAL CANISTER ASSEMBLY
(a) Replace the charcoal canister assembly.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch to the ON position and turn the tester on.
(d) Wait for at least 60 seconds.
(e) On the tester, select the following menu items: Powertrain / Engine and ECT / Trouble Codes.

HINT: If no pending DTC is displayed on the tester, the repair has been successfully completed.

NEXT -- COMPLETED
7. REPAIR OR REPLACE WIRE HARNESS AND CONNECTORS
(a) Repair or replace the wire harness and connectors.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch to the ON position and turn the tester on.
(d) Wait for at least 60 seconds.
(e) On the tester, select the following menu items: Powertrain / Engine and ECT / Trouble Codes.

HINT: If no pending DTC is displayed on the tester, the repair has been successfully completed.

NEXT -- COMPLETED
8. REPLACE ECM
(a) Replace the ECM (Removal).
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position and turn the tester on.
(d) Wait for at least 60 seconds.
(e) On the tester, select the following menu items: Powertrain / Engine and ECT / Trouble Codes.

HINT: If no pending DTC is displayed on the tester, the repair has been successfully completed.

NEXT -- COMPLETED
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