Sfi System - P0453

Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

2Uz-Fe Engine Control System

Title:

Sfi System

  1. Dtc summary

  2. Description

  3. Monitor description

  4. Monitor strategy

  5. Typical enabling conditions

  6. Typical malfunction thresholds

  7. Wiring diagram

  8. Inspection procedure

  9. Confirm dtc and evap pressure

  10. Check harness and connector (canister pump module - ecm)

  11. Check harness and connector (canister pump module - ecm)

  12. Check harness and connector (canister pump module - ecm)

  13. Replace canister assembly

  14. Repair or replace harness or connector

  15. Replace ecm

  16. Check whether dtc output recurs (after repair)

DTC P0450 Evaporative Emission Control System Pressure Sensor Malfunction

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 Area
Detection Timing
Detection Logic
P0450
Pressure sensor voltage abnormal fluctuation
Sensor output voltage rapidly fluctuates beyond upper and lower malfunction thresholds for 0.5 second.
  1. Pump module
  2. Connector / Wire harness (Pump module - ECM)
  3. ECM
  1. EVAP monitoring (ignition OFF)
  2. Ignition ON
1 trip
P0451
Pressure sensor noising
Sensor output voltage fluctuates frequently in certain time period.
  1. Pump module
  2. Connector / Wire harness (Pump module - ECM)
  3. ECM
  1. EVAP monitoring (ignition OFF)
  2. Engine running
2 trip
P0451
Pressure sensor stuck
Sensor output voltage does vary in certain time period.
  1. Pump module
  2. Connector / Wire harness (Pump module - ECM)
  3. ECM
EVAP monitoring (ignition OFF)
2 trip
P0452
Pressure sensor voltage low
Sensor output voltage is less than 0.45 V for 0.5 second.
  1. Pump module
  2. Connector / Wire harness (Pump module - ECM)
  3. ECM
  1. Ignition ON
  2. EVAP monitoring (ignition OFF)
1 trip
P0453
Pressure sensor voltage high
Sensor output voltage is more than 4.9 V for 0.5 second.
  1. Pump module
  2. Connector / Wire harness (Pump module - ECM)
  3. 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 circuit description can be found in the Evaporative Emission (EVAP) system (Click here).

MONITOR DESCRIPTION

  1. DTC P0451: Canister pressure sensor noise or stuckIf the canister pressure sensor voltage output fluctuates rapidly for 15 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, the ECM interprets this as the sensor being stuck, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.(Both of the malfunctions are detected by 2 trip detection logic). 4Runner
    DTC P0450: Canister pressure sensor output abnormal fluctuation
    If the canister pressure sensor output rapidly fluctuates between less than 42.1 kPa and more than 123.8 kPa, 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).
  2. DTC P0451: Canister pressure sensor noise or stuck
    If the canister pressure sensor voltage output fluctuates rapidly for 15 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, the ECM interprets this as the sensor being stuck, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.
    (Both of the malfunctions are detected by 2 trip detection logic).
  3. DTC P0452: Canister pressure sensor voltage low
    If the canister pressure sensor output is below 42.1 kPa, 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).
  4. DTC P0453: Canister pressure sensor voltage high
    If the canister pressure sensor output is 123.8 kPa 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


Related DTCs
P0450: Evaporative emission control system pressure sensor/switch chattering
P0451: Evaporative emission control system pressure sensor noise
P0451: Evaporative emission control system pressure sensor stuck
P0452: Evaporative emission control system pressure sensor/switch low input
P0453: Evaporative emission control system pressure sensor/switch high input
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, P0453
15 seconds: P0451 sensor noise
MIL Operation
Immediate: P0450, P0452, P0453
2 driving cycles: P0451
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


All:
The monitor will run whenever these DTCs are not present
None

Pressure sensor noise:
Atmospheric pressure
70 to 110 kPa (525 to 825 mmHg)
Battery voltage
10.5 V or more
IAT
4.4 to 35°C (40 to 95°F)
EVAP pressure sensor malfunction (P0450, P0452, P0453)
Not detected
Either of the following conditions is met
Condition 1 or 2
1. Time after key off
5 or 7 or 9.5 hours
2. Engine condition
Running

Pressure sensor stuck:
Atmospheric pressure
70 to 110 kPa (525 to 825 mmHg)
Battery voltage
10.5 V or more
IAT
4.4 to 35°C (40 to 95°F)
EVAP pressure sensor malfunction (P0450, P0452, P0453)
Not detected
Time after key off
5 or 7 or 9.5 hours

Pressure sensor chattering, low/high voltage:
Battery voltage
8 V or more
Ignition switch
ON
Starter
OFF

TYPICAL MALFUNCTION THRESHOLDS


Pressure sensor noise:
Frequency that EVAP pressure change is 0.3 kPa or more
10 times or more for 10 sec.

Pressure sensor stuck:
EVAP pressure change during reference pressure measurement
Less than 0.65 kPa (4.9 mmHg)

Pressure sensor chattering:
EVAP pressure
Less than 42.11 kPa (316 mmHg), or more than 123.761 kPa (928 mmHg)

Pressure sensor low pressure:
EVAP pressure
Less than 42.11 kPa (316 mmHg)

Pressure sensor high pressure:
EVAP pressure
More than 123.761 kPa (928 mmHg)

WIRING DIAGRAM

Refer to EVAP System (Click here).

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.
  1. Do not disassemble the canister pump module.
  1. The intelligent tester is required to conduct the following diagnostic troubleshooting procedure.
1.CONFIRM DTC AND EVAP PRESSURE

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

  1. Read the values.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / EVAP / VAPOR PRESS.

  1. Read the EVAP pressure displayed on the intelligent tester.

    Result:

    Display (DTC Output)
    		Test Result
    		Suspected Trouble Areas
    		Proceed to
    P0451
    		-
    1. Canister pressure sensor
    		A
    P0452
    		Less than 45 kPa (338 mmHg)
    1. Wire harness/connector (ECM - canister pressure sensor)
    2. Canister pressure sensor
    3. Short in ECM circuit
    		B
    P0453
    		More than 120 kPa (900 mmHg)
    1. Wire harness/connector (ECM - canister pressure sensor)
    2. Canister pressure sensor
    3. Open in ECM circuit
    		C


Anext
GO TO EVAP SYSTEM

Cnext
Go to step 4
B
next down

2.CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
  1. Disconnect the E8 ECM connector. 4Runner

  2. Disconnect the E8 ECM connector.

  1. Turn the ignition switch OFF.

  1. Measure the resistance of the wire harness side connectors.

    Result:

    Test Results
    		Suspected Trouble Areas
    		Proceed to
    10 Ω or less
    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.



Bnext
Go to step 7
A
next down

3.CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
  1. Disconnect the L4 canister connector. 4Runner

  2. Disconnect the L4 canister connector.

  1. Disconnect the E8 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Result:

    Test Results
    		Suspected Trouble Areas
    		Proceed to
    10 kΩ or more
    1. Short in canister pressure sensor circuit
    		A
    10 Ω or less
    1. Short in wire harness / connector (ECM - canister pressure sensor)
    		B

  1. Reconnect the canister connector.

  1. Reconnect the ECM connector.



Anext
Go to step 5

Bnext
Go to step 6

4.CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM)
  1. Disconnect the L4 canister connector. 4Runner

  2. Disconnect the L4 canister connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage of the canister pump module connector.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    L4-4 - Body ground
    		4.5 to 5.0 V
    L4-3 - Body ground
    		4.5 to 5.0 V

  1. Measure the resistance of the canister pump module connector.

    Standard resistance:
    Tester Connections
    		Specified Conditions
    L4-2 - Body ground
    		100 Ω or less

    Result:

    Test Results
    		Suspected Trouble Areas
    		Proceed to
    Voltage and resistance within standard ranges
    1. Open in canister pressure sensor circuit
    		A
    Voltage and resistance outside standard ranges
    1. Open in wire harness/connector (ECM - canister pressure sensor)
    		B

  1. Connect the canister connector.



Bnext
Go to step 6
A
next down

5.REPLACE CANISTER ASSEMBLY

  1. Replace canister assembly (Click here).



NEXTnext
Go to step 8

6.REPAIR OR REPLACE HARNESS OR CONNECTOR
HINT:
If the exhaust tail pipe has been removed, go to the next step before reinstalling it.


NEXTnext
Go to step 8

7.REPLACE ECM

  1. Replace ECM (Click here).


NEXT
next down

8.CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Wait for at least 60 seconds.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

    HINT:
    If no pending DTC is displayed on the intelligent tester, the repair has been successfully completed.

NEXT
next down
COMPLETED