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P0451





1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0451-P0453: Evaporative Emission Control System Pressure Sensor Range / Performance


DTC SUMMARY





HINT
The canister pressure sensor is built into the canister pump module.

DESCRIPTION

Refer to EVAP (Evaporative Emission) System Component Tests and General Diagnostics.

MONITOR DESCRIPTION





1. DTC P0451: Canister pressure sensor signal has noise

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. The ECM then illuminates the MIL and stores the DTC (2 trip detection logic).

2. DTC P0452: Canister pressure sensor voltage is low

If the canister pressure sensor output [pressure] is below 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 stores the DTC (1 trip detection logic).

3. DTC P0453: Canister pressure sensor voltage is high

If the canister pressure sensor output [pressure] is 123.8 kPa-a (928.4 mmHg-a) or higher, 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 stores the DTC (1 trip detection logic).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0451 (Noise Monitor)





P0452 and P0453





TYPICAL MALFUNCTION THRESHOLDS

P0451: Canister Pressure Sensor Signal Noise





P0452: Canister Pressure Sensor Low Voltage





P0453: Canister Pressure Sensor High Voltage





CONFIRMATION DRIVING PATTERN





NOTICE:
* The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes.
* Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
* Do not run the engine during this operation.
* When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON and turn the Techstream on.

3. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.

4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).

5. Turn the ignition switch off and wait for at least 30 seconds.

6. Turn the ignition switch to ON and turn the Techstream on [A].

7. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

8. After Evaporative System Check is completed, check All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All readiness.

9. Input the DTC: P0451, P0452 or P0453.

10. Check the DTC judgment result [B].





HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

11. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When a vehicle is brought into the workshop, leave it as it is. Do not change the condition of the vehicle. For example, do not tighten the fuel tank cap assembly.
* 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 ON (do not start the engine).

(c) Turn the Techstream 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 Techstream.

Result





C -- GO TO EVAP SYSTEM Component Tests and General Diagnostics

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

2. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

(a) Turn the ignition switch off.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

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 canister pump module connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Result





(d) Reconnect the canister pump module connector.

(e) Reconnect the ECM connector.

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE CANISTER ASSEMBLY

4. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)





(a) Disconnect the canister pump module connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(c) Turn the ignition switch to ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Result





Text in Illustration





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE CANISTER ASSEMBLY

5. REPLACE CANISTER ASSEMBLY

(a) Replace the canister assembly Removal.

NOTICE:
When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose.





Text in Illustration





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

6. REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT
If the exhaust 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 -- Continue to next step.

8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Connect the Techstream to the DLC3.

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

(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the ignition switch off and wait for at least 30 seconds.

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

(f) Start the engine and warm it up.

(g) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(h) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

(i) Input the DTC: P0451, P0452 or P0453.

(j) Check the DTC judgment result.

HINT
If the DTC judgment result is NORMAL, the repair has been successfully completed.

NEXT -- COMPLETED
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