Dtc P0450 Evaporative Emission Control System Pressure Sensor / Switch

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 PUMP MODULE - ECM)

REPLACE ECM

CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

DTC P0450 Evaporative Emission Control System Pressure Sensor / Switch

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 Items
Malfunction Detection Conditions
Trouble Areas
Detection Timings
Detection Logic
P0450
Canister pressure sensor voltage fluctuation abnormal
Sensor output voltage rapidly fluctuates beyond upper and lower malfunction thresholds for 0.5 seconds.
  1. Canister pump module
  2. EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  3. ECM
  1. EVAP monitoring (ignition OFF)
  2. Ignition ON
1 trip
P0451
Canister pressure sensor noise
Sensor output voltage fluctuates frequently within 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 OFF)
  2. Engine running
2 trip
Canister pressure sensor signal becomes fixed/flat
Sensor output voltage does not vary within 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 OFF)
2 trip
P0452
Canister pressure sensor voltage low
Sensor output less than 42.11 kPa(abs) [315.85 mmHg(abs)] for 0.5 seconds.
  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. Ignition ON
  2. EVAP monitoring (ignition OFF)
1 trip
P0453
Canister pressure sensor voltage stuck
Sensor output more than 123.761 kPa(abs) [928.28 mmHg(abs)] for 0.5 seconds.
  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. Ignition ON
  2. EVAP monitoring (ignition 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 (YARIS_NCP93 RM0000011IO01OX_07.html).

MONITOR DESCRIPTION


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0450 Evaporative Emission Control System Pressure Sensor / Switch

  1. DTC P0450: Canister pressure sensor voltage abnormal fluctuation
    If the canister pressure sensor voltage output [pressure] rapidly fluctuates between less than 0.45 V: 42.11 kPa(abs) [315.85 mmHg(abs)] and more than 4.9 V: 123.761 kPa(abs) [928.28 mmHg(abs)], the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP (Evaporative Emission) system monitor. The ECM then illuminates the MIL and stores the DTC (1 trip detection logic).
  2. 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.
    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 stores the DTC.
    (Both the malfunctions are detected by 2 trip detection logic).
  3. 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 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).
  4. 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 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
Once per driving cycle: P0451 sensor stuck
Continuous: P0451 sensor noise, P0450, P0452 and P0453
Duration
0.5 seconds: P0450, P0452 and P0453
Within 2 minutes: P0451 (sensor stuck)
Within 15 seconds: P0451 (sensor noise)
MIL Operation
Immediate: P0450, 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 more
Intake air temperature
4.4° to 35°C (40° to 95°F)
Canister pressure sensor malfunction (P0450, P0452, 0453)
Not detected
Either of following conditions met
A or B
A. Engine condition
Running
B. Time after key-off
5 or 7 or 9.5 hours

P0451 (Stuck monitor):
Monitor runs whenever following DTCs not present
None
Battery voltage
10.5 V or more
Intake air temperature
4.4° to 35°C (40° to 95°F)
Canister pressure sensor malfunction (P0450, P0452, 0453)
Not detected
Atmospheric pressure (absolute pressure)
70 to 110 kPa(abs) [525 to 825 mmHg(abs)]
Time after key-off
5 or 7 or 9.5 hours

P0450, P0452 and P0453:
Monitor runs whenever following DTCs not present
None
Either of following conditions met
(a) or (b)
(a) Ignition switch
ON
(b) Soak timer
ON

TYPICAL MALFUNCTION THRESHOLDS


P0450: Canister pressure sensor chattering
EVAP pressure
Less than 42.11 kPa(abs) [315.85 mmHg(abs)], or more than 123.761 kPa(abs) [928.28 mmHg(abs)]

P0451: Canister pressure sensor noise
Frequency that EVAP pressure change 0.3 kPa-g (2.25 mmHg-g) or more
10 times or more in 10 seconds

P0451: Canister pressure sensor stuck
EVAP pressure change during reference pressure
Less than 0.65 kPa(gauge) [4.87 mmHg(gauge)]

P0452: Canister pressure sensor low voltage
EVAP pressure
Less than 42.11 kPa(abs) [315.85 mmHg(abs)]

P0453: Canister pressure sensor high voltage
EVAP pressure
More 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 19 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. 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: P0450, P0451, P0452 or P0453.
  10. 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:
    If the judgment result shows ABNORMAL, the system has a malfunction.
  11. If the result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (YARIS_NCP93 RM000000PDK0QGX.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 P0450 Evaporative Emission Control System Pressure Sensor / Switch


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 Results
    		Suspected Trouble Areas
    		Proceed To
    P0451
    		-
    		Canister pressure sensor
    		C
    P0452
    		Less than 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
    		More 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 RM0000011IO01OX.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
Test Results
Suspected Trouble Areas
Proceed To
C20-71 (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
Test Results
Suspected Trouble Areas
Proceed To
C20-71 (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 P0450 Evaporative Emission Control System Pressure Sensor / Switch

  1. Disconnect the canister pump module connector.

  1. Turn the ignition switch to ON.

  1. Measure the voltage and resistance of the canister connector.

Standard Voltage:
Tester Connections
Specified Conditions
J25-4 (VCC) - Body ground
4.5 to 5.5 V
J25-3 (VOUT) - Body ground
Standard Resistance:
Tester Connections
Specified Conditions
J25-2 (SGND) - Body ground
Below 100 Ω
Text in Illustration
*a
Front view of wire harness connector
(to Canister Pump Module)

Result
Test Results
Suspected Trouble Areas
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

  1. Reconnect the canister pump module connector.



A
Go to step 5

B
Go to step 6

5.REPLACE CANISTER


  1. Replace the canister assembly (YARIS_NCP93 RM000001E2T00BX.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 P0450 Evaporative Emission Control System Pressure Sensor / Switch


    Text in Illustration
    *1
    		Fuel Tank Vent Hose
    		*2
    		Air Inlet Port
    *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 PUMP MODULE - ECM)
HINT:
If the exhaust tail pipe 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 RM000001CN002AX.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 RM000000PDK0QGX.html).

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

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

  1. Start the engine and warm it up.

  1. Drive the vehicle in accordance with the driving pattern described in 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