P0453

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

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 EVAP (Evaporative Emission) system EVAP System.

MONITOR DESCRIPTION

1 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).





2 DTC P0452: Canister pressure sensor voltage low
If the pressure sensor output voltage is below 0.45 V [42.1 kPa-a (315.9 mmHg-a)], 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).
3 DTC P0453: Canister pressure sensor voltage high
If the canister pressure sensor voltage output is 4.9 V [123.8 kPa-a (928.4 mmHg-a)] 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

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





P0451 (Canister pressure sensor noise):





P0451 (Canister pressure sensor stuck):





TYPICAL MALFUNCTION THRESHOLDS

P0451: Canister pressure sensor noise





P0451: Canister pressure sensor stuck





P0452: Canister pressure sensor low voltage





P0453: Canister pressure sensor high voltage





WIRING DIAGRAM





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.
NOTE:
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) (do not start the engine).
(c) Turn the Techstream on.
(d) Wait for at least 60 seconds.
(e) Enter the following menus: Powertrain / Engine / Trouble Code.
HINT: If no pending DTCs are displayed on the Techstream, the repair has been successfully completed.

NEXT -- COMPLETED