Engine Control System - SFI System (from 12/2010)

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 (from 12/2010).

MONITOR DESCRIPTION





1. DTC P0451: Canister pressure sensor noising 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 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 canister pressure sensor output voltage is below 0.45 V, the ECM interprets this as an open or short circuit in the 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 or more, the ECM interprets this as an open or short circuit in the 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





P0452 and P0453 (Pressure sensor, low voltage, high voltage):





P0451 (Pressure sensor noise):





P0451 (Pressure sensor stuck):





TYPICAL MALFUNCTION THRESHOLDS

P0451: Pressure sensor noise





P0451: Pressure sensor stuck





P0452: Pressure sensor low voltage





P0453: 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 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).

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 / Data List / All Data / Intake Air.

4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear (from 12/2010).

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

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

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

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

9. Read the pending DTCs [B].

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

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

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

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

13. 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.

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

15. 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.

16. 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 (from 12/2010).

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 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 canister pump module connector.





(b) Turn the ignition switch to ON.

(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 Removal (from 12/2010).

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.





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

3. CHECK HARNESS AND CONNECTOR

(a) Disconnect the canister pump module connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance between the terminals of the wire harness side connectors.

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 (from 12/2010).

NEXT -- Continue to next step.

5. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON (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 Codes / Pending.

HINT
If no pending DTCs are output to the Techstream, the repair has been successfully completed.

NEXT -- REPAIR COMPLETED