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P0453





2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0451-P0453: Evaporative Emission Control System Pressure Sensor Range / Performance


DTC SUMMARY





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

DESCRIPTION

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

MONITOR DESCRIPTION

- DTC P0451: Canister pressure sensor noisy or stuck

- If the canister pressure sensor output voltage 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 output voltage 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 the malfunctions are detected by 2 trip detection logic).





- DTC P0452: Canister pressure sensor voltage low

- If the pressure sensor output voltage is below 0.45 V [42.1 kPa (315.9 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 P0453: Canister pressure sensor voltage high

- If the canister pressure sensor voltage output is 4.9 V [123.8 kPa (928.4 mmHg)] 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

All:

All::





P0452 and P0453 (Canister pressure sensor low voltage, high voltage):

P0452 and P0453 (Canister pressure sensor low voltage, high voltage)::





P0451 (Canister pressure sensor noise):

P0451 (Canister pressure sensor noise)::





P0451 (Canister pressure sensor stuck):

P0451 (Canister pressure sensor stuck)::





TYPICAL MALFUNCTION THRESHOLDS

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





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 more, 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).
- Connect the Techstream to the DLC3.

- Turn the engine switch on (IG) and turn the Techstream on.

- Enter the following menus: Powertrain / Engine / Data List / Intake Air.

- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.

- Turn the engine switch off and wait for 30 seconds.

- Turn the engine switch on (IG) and turn the Techstream on.

- Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [A].

- After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Trouble Codes / Pending.

- Read the pending DTC [B].

- If a pending DTC is output, the system is malfunctioning.

HINT
If a pending DTC is not output, perform the following procedure.

- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P0451, P0452 or P0453.

- Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [A] again.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Check the judgment result.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
INSPECTION PROCEDURE

NOTICE:
- When a vehicle is brought into a 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.
- Techstream is required to conduct the following diagnostic troubleshooting procedure.
PROCEDURE

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

(a) Disconnect the L2 canister pump module connector.





(b) Turn the engine switch on (IG).

(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 -- CHECK HARNESS AND CONNECTOR
A -- Continue to next step.

2. REPLACE CHARCOAL 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 pipe to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose.





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

3. CHECK HARNESS AND CONNECTOR

(a) Disconnect the L2 canister pump module connector.

(b) Disconnect the B12 ECM connector.

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

Standard resistance (Check for open):





Standard resistance (Check for short):





(d) Reconnect the canister pump module connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- Continue to next step.

5. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

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

(e) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

HINT
If no pending DTCs are displayed on the Techstream, the repair has been successfully completed.

NEXT -- COMPLETED
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