Toyota Tundra Service Manual: Evaporative Emission Control System Pressure Sensor Range / Performance (P0451-P0453)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Evaporative Emission Control System Pressure Sensor Range / Performance (P0451-P0453)

DTC SUMMARY

DTC No.

Monitoring Item

Malfunction Detection Condition

Trouble Area

Detection Timing

Detection Logic

P0451

Canister pressure sensor noise

Sensor output voltage fluctuates frequently within certain time period.

  • Canister pump module
  • Connector/wire harness

    (Canister pump module - ECM)

  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
  • EVAP monitoring (ignition switch off)
  • Engine running

2 trip

P0451

Canister pressure sensor becomes fixed/flat

Sensor output voltage does not vary in a certain time period.

  • Canister pump module
  • Connector/wire harness

    (Canister pump module - ECM)

  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
  • EVAP monitoring (ignition switch off)

2 trip

P0452

Canister pressure sensor low input

EVAP pressure Below 42.1 kPa for 0.5 seconds.

  • Canister pump module
  • Connector/wire harness

    (Canister pump module - ECM)

  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
  • Ignition switch ON
  • EVAP monitoring (ignition switch off)

1 trip

P0453

Canister pressure sensor high input

EVAP pressure higher than 123.8 kPa for 0.5 seconds.

  • Canister pump module
  • Connector/wire harness

    (Canister pump module - ECM)

  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
  • Ignition switch ON
  • EVAP monitoring (ignition switch off)

1 trip

HINT:

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

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) system (See page ).

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 stores the DTC (2 trip detection logic).

    Alternatively, if the sensor voltage output 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 stores the DTC (both 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 less than 0.45 V: 42.1 kPa-a (315.8 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 high

    If the canister pressure sensor voltage output (pressure) is higher than 4.9 V: 123.8 kPa-a (928.6 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).

MONITOR STRATEGY

Required Sensors/Components

Canister pump module

Frequency of Operation

Continuous

Duration

Within 15 seconds: P0451 sensor noise

Within 2 minutes: P0451 sensor fixed/flat

0.5 seconds: P0452 and P0453

MIL Operation

Immediate: P0452 and P0453

2 driving cycles: P0451

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

P0451 (Noise Monitor)

Monitor runs whenever following DTCs not present

P0452, P0453 (EVAP system)

Atmospheric pressure (absolute pressure)

70 to 110 kPa-a (525 to 825 mmHg-a)

Battery voltage

10.5 V or higher

Intake air temperature

4.4 to 40°C (40 to 104°F)

Either of following conditions met

A or B

A. Engine condition

Running

B. Time after key off

5, 7 or 9.5 hours

P0451 (Fixed/Flat Monitor)

Monitor runs whenever following DTCs not present

P0452, 0453 (EVAP system)

Battery voltage

10.5 V or higher

Intake air temperature

4.4 to 40°C (40 to 104°F)

Atmospheric pressure (absolute pressure)

70 to 110 kPa-a (525 to 825 mmHg-a)

Time after key off

5, 7 or 9.5 hours

P0452 and P0453

Monitor runs whenever following DTCs not present

None

Battery voltage

8 V or higher

Starter

OFF

Either of following conditions met

(a) or (b)

(a) Ignition switch

ON

(b) Soak timer

ON

TYPICAL MALFUNCTION THRESHOLDS

P0451: Canister Pressure Sensor Noise

Frequency that EVAP pressure changes 0.3 kPa-g (2.25 mmHg-g) or higher

10 times or more in 10 seconds

P0451: Canister Pressure Sensor Voltage Fixed

EVAP pressure change during reference pressure measurement

Below 0.65 kPa-a (4.87 mmHg-a)

P0452: Canister Pressure Sensor Low Voltage

EVAP pressure sensor voltage

Less than 0.45 V [42.1 kPa-a (315.8 mmHg-a)]

P0453: Canister Pressure Sensor High Voltage

EVAP pressure sensor voltage

Higher than 4.9 V [123.8 kPa-a (928.6 mmHg-a)]

CONFIRMATION DRIVING PATTERN

NOTICE:

  • The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 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 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.
  7. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
  8. After the "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.

    Tester Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

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

  11. If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

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

WIRING DIAGRAM

Refer to the EVAP system (See page ).

CAUTION / NOTICE / HINT

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.
  • 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 Codes.

(e) Read 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

Result

Test Result

Suspected Trouble Area

Proceed to

P0451

-

Canister pressure sensor

C

P0452

Below 42.1 kPa-a (315.8 mmHg-a)

  • Wire harness/connector (ECM - Canister pressure sensor)
  • Canister pressure sensor
  • Short in ECM circuit

A

P0453

Higher than 123.8 kPa-a (928.6 mmHg-a)

  • Wire harness/connector (ECM - Canister pressure sensor)
  • Canister pressure sensor
  • Open in ECM circuit

B

B

GO TO STEP 4

C

GO TO EVAP SYSTEM

A

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

Tester Connection

Condition

Specified Condition

Suspected Trouble Area

Proceed to

D74-121 (PPMP) - Body ground

Always

10 Ω or less

  • Wire harness/connector (ECM - Canister pressure sensor)
  • Short in canister pressure sensor circuit

A

D74-121 (PPMP) - Body ground

Always

10 kΩ or higher

  • Wire harness/connector (ECM - Canister pressure sensor)
  • Short in ECM circuit

B

B

GO TO STEP 7

A

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

Tester Connection

Condition

Specified Condition

Suspected Trouble Area

Proceed to

D74-121 (PPMP) - Body ground

Always

10 kΩ or higher

Short in canister pressure sensor circuit

A

D74-121 (PPMP) - Body ground

Always

10 Ω or less

Short in wire harness/connector (ECM - Canister pressure sensor)

B

A

GO TO STEP 5

B

GO TO STEP 6

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:

Tester Connection

Condition

Specified Condition

R12-8 (SGND) - Body ground

Always

100 Ω or less

(c) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

R12-6 (VCC) - Body ground

Ignition switch ON

4.5 to 5.5 V

R12-7 (VOUT) - Body ground

Ignition switch ON

4.5 to 5.5 V

Result

Result

Suspected Trouble Area

Proceed to

Voltage and resistance within standard ranges

Open in canister pressure sensor circuit

A

Voltage and resistance outside standard ranges

Open in wire harness/connector (ECM - Canister pressure sensor)

B

B

GO TO STEP 6

A

5.

REPLACE CANISTER PUMP MODULE

(a) Replace the canister pump module (See page ).

NOTICE:

  • When replacing the canister pump module, check the canister pump module interior, canister 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. If liquids are present in the canister interior, replace the canister and canister pump module together.
  • Check for filter blockage in the canister. If the charcoal filter inside the canister is clogged, replace the canister and canister pump module together.
  • Check for filter blockage in the canister filter. If the canister filter has blockages, replace the fuel tank inlet pipe sub-assembly.
Text in Illustration

*1

Fuel Tank

*2

Fuel Tank Vent Hose

*3

Canister Assembly

*4

Canister Pump Module

- Canister Pressure Sensor

- Leak Detection Pump

- Vent Valve

*5

Fuel Tank Inlet Pipe Sub-assembly (Canister Filter)

*6

Canister Outlet Hose

*a

Inspection Area (check for disconnection and/or cracks)

-

-

NEXT

GO TO STEP 8

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

GO TO STEP 8

7.

REPLACE ECM

(a) Replace the ECM (See page ).

NEXT

8.

CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (See page ).

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

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

(g) Start the engine and warm it up.

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

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

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

(k) Check the DTC judgment result.

Techstream Display

Description

NORMAL

  • DTC judgment completed
  • System normal

ABNORMAL

  • DTC judgment completed
  • System abnormal

INCOMPLETE

  • DTC judgment not completed
  • Perform driving pattern after confirming DTC enabling conditions

N/A

  • Unable to perform DTC judgment
  • Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit
NEXT

END

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    Evaporative Emission Control System Leak Detected (Gross Leak) (P0455,P0456)

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