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Home >> Lexus >> 2012 >> LS 460 AWD V8-4.6L (1UR-FSE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0452

P0452





1UR-FSE 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

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

MONITOR DESCRIPTION





1. DTC P0451: Canister pressure sensor noise or fixed/flat

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 fixed/flat, 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 voltage output [pressure] is below 0.45 V [42.11 kPa-a (315.85 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 sets the DTC (1 trip detection logic).

3. DTC P0453: Canister pressure sensor voltage high

If the canister pressure sensor voltage output [pressure] is 4.9 V [123.761 kPa-a (928.28 mmHg-a)] or more, 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 sets the DTC (1 trip detection logic).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0451 (Noise monitor):





P0451 (Fixed/flat monitor):





P0452 and P0453:





TYPICAL MALFUNCTION THRESHOLDS

P0451: Canister pressure sensor noise





P0451: Canister pressure sensor fixed/flat





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

3. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp B1S1 and Intake Air Temp B2S1.

4. Check that the intake air temperature is between 4.4 and 35°C (40 and 95°F).

5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

6. Turn the engine switch off and wait for at least 30 seconds.

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

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

9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

10. Read the pending DTCs.

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

14. If the test result is INCOMPLETE or N/A 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 vehicle condition. For example, do not tighten the fuel 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 engine switch on (IG) (do not start the engine).

(c) Turn the Techstream on.

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

(e) Read DTCs.

(f) Enter the following menus: Powertrain / Engine / Data List / EVAP / Vapor Pressure Pump.

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

Result:





B -- CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

C -- GO TO EVAP SYSTEM EVAP System
A -- Continue to next step.

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





(a) Turn the engine switch off.

(b) Disconnect the E1 ECM connector.

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

Result:





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

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





(a) Disconnect the V1 canister pump module connector.

(b) Disconnect the E1 ECM connector.

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

Result:





A -- REPLACE CANISTER ASSEMBLY

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR ((CANISTER PUMP MODULE - ECM))

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





(a) Disconnect the V1 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 voltage:





Standard resistance:





Result:





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR ((CANISTER PUMP MODULE - ECM))
A -- Continue to next step.

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.
- Check for filter blockage in the canister filter. If the canister filter has blockages, replace the canister filter.





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

6. REPAIR OR REPLACE HARNESS OR CONNECTOR ((CANISTER PUMP MODULE - ECM))

HINT
If the exhaust tailpipe 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 engine switch on (IG) and turn the Techstream on.

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

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

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

(f) Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.

(g) Enter the following menus: Powertrain / Engine / Utility / All Readiness.

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

(i) Check the DTC judgment result.

Result





NEXT -- COMPLETED
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