Dtc P0451 Evaporative Emission Control System Pressure Sensor Range / Performance

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

DTC SUMMARY

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CONFIRM DTC AND EVAP PRESSURE

CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)

REPLACE CANISTER

REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER - ECM)

REPLACE ECM

CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

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


DTC No.
Monitoring Item
Malfunction Detection Condition
Trouble Area
Detection Timing
Detection Logic
P0451
Canister pressure sensor abnormal voltage fluctuation
Sensor output voltage fluctuates frequently in a certain time period.
  1. Canister pump module
  2. Connector/wire harness
    (Canister pump module - ECM)
  3. EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  4. ECM
  1. EVAP monitoring (ignition switch off)
  2. Engine running
2 trip
Canister pressure sensor constant voltage
Sensor output voltage does not vary in a certain time period.
  1. EVAP monitoring (ignition switch off)
2 trip
P0452
Canister pressure sensor low input
EVAP pressure sensor less than 42.11 kPa(abs) [315.85 mmHg(abs)] for 0.5 seconds.
  1. Ignition switch ON
  2. EVAP monitoring (ignition switch off)
1 trip
P0453
Canister pressure sensor high input
EVAP pressure sensor more than 123.761 kPa(abs) [928.28 mmHg(abs)] for 0.5 seconds.
  1. Ignition switch ON
  2. 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 EVAP (Evaporative Emission) System (YARIS_NCP93 RM0000011IO028X_07.html).

MONITOR DESCRIPTION


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0451 Evaporative Emission Control System Pressure Sensor Range / Performance

  1. DTC P0451: Canister pressure sensor abnormal voltage fluctuation or being constant
    If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the canister pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC.
    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 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(abs) [315.85 mmHg(abs)], 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 stores 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(abs) [928.28 mmHg(abs)] 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 stores the DTC (1 trip detection logic).

MONITOR STRATEGY


Required Sensors/Components
Canister pump module
Frequency of Operation
Continuous
Duration
0.5 seconds: P0452 and P0453
Within 2 minutes: P0451 (sensor stuck)
Less than 15 seconds: P0451 (sensor noise)
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
None
Atmospheric pressure (absolute pressure)
70 to 110 kPa(abs) [525 to 825 mmHg(abs)]
Battery voltage
10.5 V or higher
Intake air temperature
4.4 to 35°C (40 to 95°F)
Canister pressure sensor malfunction (P0452, P0453)
Not detected
Either of following conditions met
A or B
A. Engine condition
Running
B. Time after key-off
5, 7 or 9.5 hours

P0451 (Stuck Monitor)
Monitor runs whenever following DTCs not present
None
Battery voltage
10.5 V or higher
Intake air temperature
4.4 to 35°C (40 to 95°F)
Canister pressure sensor malfunction (P0452, P0453)
Not detected
Atmospheric pressure (absolute pressure)
70 to 110 kPa(abs) [525 to 825 mmHg(abs)]
Time after key-off
5, 7 or 9.5 hours

P0452 and P0453
Monitor runs whenever following DTCs not present
None
Ignition switch
ON
Battery voltage
8 V or higher

TYPICAL MALFUNCTION THRESHOLDS


P0451: Canister Pressure Sensor Noise
Frequency that EVAP pressure change 0.3 kPa(gauge) [2.25 mmHg(gauge)] or higher
10 times or more in 10 seconds

P0451: Canister Pressure Sensor Fixed/flat
EVAP pressure change during reference pressure measurement
Below 0.65 kPa(gauge) [4.876 mmHg(gauge)]

P0452: Canister Pressure Sensor Low Voltage
EVAP pressure
Below 42.11 kPa(abs) [315.85 mmHg(abs)]

P0453: Canister Pressure Sensor High Voltage
EVAP pressure
Higher than 123.761 kPa(abs) [928.28 mmHg(abs)]

CONFIRMATION DRIVING PATTERN

NOTICE:
  1. The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes.
  2. 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.
  3. Do not run the engine during this operation.
  4. 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. Check that the intake air temperature is between 4.4 and 35°C (40 and 95°F).
  5. Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure) (YARIS_NCP93 RM000000PDK0T5X.html).
  6. Turn the ignition switch off and wait for at least 30 seconds.
  7. Turn the ignition switch to ON and turn the Techstream on.
  8. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
  9. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All readiness.
  10. Input the DTC: P0451, P0452 or P0453.
  11. Check the DTC judgment result.

    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
  12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (YARIS_NCP93 RM000000PDK0T5X.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0451 Evaporative Emission Control System Pressure Sensor Range / Performance


INSPECTION PROCEDURE

NOTICE:
  1. 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.
  2. Do not disassemble the canister pump module.
  3. The Techstream is required to conduct the following diagnostic troubleshooting procedure.
  4. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CONFIRM DTC AND EVAP PRESSURE

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON (do not start the engine).

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Read DTCs.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Pump.

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

    Result
    Display (DTC Output)
    		Test Result
    		Suspected Trouble Area
    		Proceed to
    P0451
    		-
    		Canister pressure sensor
    		C
    P0452
    		Below 42.11 kPa(abs) [315.85 mmHg(abs)]
    1. Wire harness/connector (ECM - Canister pressure sensor)
    2. Canister pressure sensor
    3. Short in ECM circuit
    		A
    P0453
    		Higher than 123.761 kPa(abs) [928.28 mmHg(abs)]
    1. Wire harness/connector (ECM - Canister pressure sensor)
    2. Canister pressure sensor
    3. Open in ECM circuit
    		B


B
Go to step 4

C
GO TO EVAP SYSTEM (YARIS_NCP93 RM0000011IO028X.html)
A


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

  1. Turn the ignition switch off.

  1. Disconnect the ECM connector.

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

    Result
    Tester Connection
    		Condition
    		Specified Condition
    		Suspected Trouble Area
    		Proceed to
    A72-35 (PPMP) - Body ground
    		Always
    		Below 10 Ω
    1. Wire harness/connector (ECM - Canister pressure sensor)
    2. Short in canister pressure sensor circuit
    		A
    10 kΩ or higher
    1. Wire harness/connector (ECM - Canister pressure sensor)
    2. Short in ECM circuit
    		B


B
Go to step 7
A


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

  1. Disconnect the canister pump module connector.

  1. Disconnect the ECM connector.

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

    Result
    Tester Connection
    		Condition
    		Specified Condition
    		Suspected Trouble Area
    		Proceed to
    A72-35 (PPMP) - Body ground
    		Always
    		10 kΩ or higher
    		Short in canister pressure sensor circuit
    		A
    Below 10 Ω
    		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)


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0451 Evaporative Emission Control System Pressure Sensor Range / Performance

  1. Disconnect the canister pump module connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J70-8 (SGND) - Body ground
    		Always
    		100 Ω or less

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    J70-6 (VCC) - Body ground
    		Ignition switch ON
    		4.5 to 5.5 V
    J70-7 (VOUT) - Body ground
    		Ignition switch ON
    		4.5 to 5.5 V

    Result
    Test Result
    		Suspected Trouble Area
    		Proceed to
    Voltage and resistance within standard ranges
    		Open in canister pressure sensor circuit
    		A
    Voltage and/or resistance outside standard ranges
    		Open in wire harness/connector (ECM - Canister pressure sensor)
    		B
Text in Illustration
*a
Front view of wire harness connector
(to Canister Pump Module)


B
Go to step 6
A


5.REPLACE CANISTER


  1. Replace the canister (YARIS_NCP93 RM000001WTG036X.html).

    NOTICE:
    1. 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.
    2. Check for filter blockage in the canister filter. If the canister filter has blockages, replace the canister filter.

    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0451 Evaporative Emission Control System Pressure Sensor Range / Performance


    Text in Illustration
    *1
    		Fuel Tank Vent Hose
    		*2
    		Air Inlet Port (behind Filler Pipe Flange Plate)
    *3
    		Vent Hose
    		*4
    		Fuel Tank
    *5
    		Canister
    		*6
    		Canister Filter
    *a
    		Inspection Area (Check for disconnection and/or cracks)
    		-
    		-


NEXT
Go to step 8

6.REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER - 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

  1. Replace the ECM (YARIS_NCP93 RM000001CN002IX.html).



NEXT
Go to step 8

8.CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Clear the DTCs (YARIS_NCP93 RM000000PDK0T5X.html).

  1. Turn the ignition switch off and wait for at least 30 seconds.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.

  1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

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

  1. Check the DTC judgment result.

    Result
    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

NEXT

END