P0450

2AZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0450-P0453: 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 canister pump module.

DESCRIPTION

The circuit description can be found in the Evaporative Emission (EVAP) system EVAP System.

MONITOR DESCRIPTION

- DTC P0450: Canister pressure sensor voltage abnormal fluctuation

- If the canister pressure sensor voltage output rapidly fluctuates between less than 0.45 V (315.9 mmHg) and more than 4.9 V (928.4 mmHg), the ECM interprets this as an open or short circuit 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).

- DTC P0451: Canister pressure sensor noisy 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 for 10 seconds, 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).

- DTC P0452: Canister pressure sensor voltage low

- If the canister pressure sensor voltage output is below 0.45 V, the ECM interprets this as an open or short circuit 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).

- DTC P0453: Canister pressure sensor voltage high

- If the canister pressure sensor voltage output is 4.9 V or more, the ECM interprets this as an open or short circuit 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

P0451 (Noise Monitor):

P0451 (Noise Monitor)::

P0451 (Stuck Monitor):

P0451 (Stuck Monitor)::

P0450, P0452 and P0453:

P0450, P0452 and P0453::

TYPICAL MALFUNCTION THRESHOLDS

P0450: Canister pressure sensor chattering

P0450: Canister pressure sensor chattering:

P0451: Canister pressure sensor noise

P0451: Canister pressure sensor noise:

P0451: Canister pressure sensor stuck

P0451: Canister pressure sensor stuck:

P0452: Canister pressure sensor low voltage

P0452: Canister pressure sensor low voltage:

P0453: Canister pressure sensor high voltage

P0453: Canister 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 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 to the ON position (do not start the engine).

(c) Turn the Techstream on.

(d) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs.

(f) Select the following menu items: Powertrain / Engine and ECT / Data List / All Data / EVAP / Vapor Pressure Pump.

(g) Read the EVAP (Evaporative Emission) pressure displayed on the Techstream.

Result:

C -- GO TO EVAP INSPECTION PROCEDURE

B -- CHECK WIRE HARNESS (CANISTER PUMP MODULE - ECM)
A -- Continue to next step.

2. CHECK WIRE HARNESS (CANISTER PUMP MODULE - ECM)

(a) Turn the ignition switch off.

(b) Disconnect the E4 ECM connector.

(c) Measure the resistance between the PPMP terminal of the ECM connector and body ground.

Result:

(d) Reconnect the ECM connector.

B -- REPLACE ECM
A -- Continue to next step.

3. CHECK WIRE HARNESS (CANISTER PUMP MODULE - ECM)

(a) Disconnect the L1 canister pump module connector.

(b) Disconnect the E4 ECM connector.

(d) Reconnect the canister pump module connector.

(e) Reconnect the ECM connector.

B -- REPAIR OR REPLACE WIRE HARNESS

A -- INSPECT CANISTER

4. CHECK WIRE HARNESS (CANISTER PUMP MODULE - ECM)

(a) Disconnect the L1 canister pump module connector.

(b) Turn the ignition switch to the ON position.

Standard resistance:

Result:

(d) Reconnect the canister pump module connector.

B -- REPAIR OR REPLACE WIRE HARNESS
A -- Continue to next step.

5. INSPECT CANISTER

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

6. REPAIR OR REPLACE WIRE HARNESS

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 ECM

(a) Replace the ECM Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to the ON position and turn the Techstream on.

(c) Wait for at least 60 seconds.

(d) On the Techstream, select the following menu items: Powertrain / Engine and ECT / Trouble Codes / Pending.

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

NEXT -- COMPLETED