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

for Preparation Click here


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) [315.867 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 higher than 123.761 kPa(abs) [928.331 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 the EVAP (Evaporative Emission) System (Click here).

MONITOR DESCRIPTION


A115543E70

  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 2 minutes, 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 less than 0.45 V: 42.11 kPa(abs) [315.867 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 higher than 4.9 V: 123.761 kPa(abs) [928.331 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).

MONITOR STRATEGY


Required Sensors/Components
Canister pump module
Frequency of Operation
Continuous
Duration
0.5 seconds: P0452 and P0453
Less than 15 seconds: P0451 (sensor noise)
Less than 2 minutes: P0451 (sensor stuck)
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
70 kPa(abs) [525 mmHg(abs)] or more, and less than 110 kPa(abs) [825 mmHg(abs)]
Battery voltage
10.5 V or more
Intake air temperature
4.4°C (40°F) or more, and less than 35°C (95°F)
Canister pressure sensor malfunction (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 are not present
None
Battery voltage
10.5 V or more
Intake air temperature
4.4°C (40°F) or more, and less than 35°C (95°F)
Canister pressure sensor malfunction (P0452, 0453)
Not detected
Atmospheric pressure
70 kPa(abs) [525 mmHg(abs)] or more, and less than 110 kPa(abs) [825 mmHg(abs)]
Time after key off
5 or 7 or 9.5 hours

P0452 and P0453 
Monitor runs whenever following DTCs are not present
None
Battery voltage
8 V or more
Starter
Off
Either of the following conditions is met
(a) or (b)
(a) Ignition switch
ON
(b) ECM
Wake up by soak timer

TYPICAL MALFUNCTION THRESHOLDS


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

P0451: Canister Pressure Sensor Stuck 
EVAP pressure change during reference pressure measurement
Less than 0.65 kPa(gauge) [4.87 mmHg(gauge)]

P0452: Canister Pressure Sensor Low Voltage 
EVAP pressure
Less than 42.11 kPa(abs) [315.867 mmHg(abs)]

P0453: Canister Pressure Sensor High Voltage 
EVAP pressure
More than 123.761 kPa(abs) [928.331 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 18 minutes.
  2. Do not perform the Evaporative System Check when the fuel tank is higher than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
  3. 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 / Primary / Intake Air.
  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).
  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 (Click here).

    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


A165038E03


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. The Techstream is required to conduct the following diagnostic troubleshooting procedure.
  3. 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
    Less than 42.11 kPa(abs) [315.867 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) [928.331 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 (Click here)
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
    B31-71 (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 more
    1. Wire harness/connector (ECM - Canister pressure sensor)
    2. Short in ECM circuit
    B
  1. Reconnect the ECM connector.



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
    B31-71 (PPMP) - Body ground
    Always
    10 kΩ or more
    Short in canister pressure sensor circuit
    A
    Below 10 Ω
    Short in wire harness/connector (ECM - Canister pressure sensor)
    B
  1. Reconnect the canister pump module connector.

  1. Reconnect the ECM connector.



A
Go to step 5

B
Go to step 6

4.CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
  1. Disconnect the canister pump module connector.

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

    Standard Voltage:

    Tester Connection
    Switch Condition
    Specified Condition
    L50-4 (VCC) - Body ground
    Ignition switch ON
    4.5 to 5.5 V
    L50-3 (VOUT) - Body ground
    Ignition switch ON
    4.5 to 5.5 V

    Standard Resistance:

    Tester Connection
    Condition
    Specified Condition
    L50-2 (SGND) - Body ground
    Always
    100 Ω or less

Result:

Test 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
  1. Reconnect the canister pump module connector.



B
Go to step 6
A


5.REPLACE CANISTER
  1. Replace the canister (Click here).

    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.

A188645E01



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
  1. Replace the ECM (Click here).



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 (Click here).

  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