Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

1Gr-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 (pump module - ecm)

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

  12. Replace charcoal canister assembly

  13. Check harness and connector (pump module - ecm)

  14. Replace charcoal canister assembly

  15. Repair or replace wire harness or connectors

  16. Replace ecm

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


DTCs
Monitoring Items
Malfunction Detection Conditions
Trouble Areas
Detection Timings
Detection Logic
P0450
Pressure sensor abnormal voltage fluctuation
Sensor output voltage rapidly fluctuates beyond upper and lower malfunction thresholds for 0.5 seconds.
  1. Pump module
  2. 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 seconds.
  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 seconds.
  1. Pump module
  2. Connector/wire harness (Pump module - ECM)
  3. ECM
  1. Ignition ON
  2. EVAP monitoring (ignition OFF)
1 trip
HINT:
The pressure sensor is built into the pump module.

DESCRIPTION

The circuit description can be found in the EVAP (Evaporative Emission) System (Click here).

MONITOR DESCRIPTION

DTC P0450: Pressure sensor abnormal voltage fluctuationIf the pressure sensor voltage output rapidly fluctuates between less than 0.45 V and more than 4.9 V, the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and stops the EVAP (Evaporative Emission) system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic). 4Runner
  1. DTC P0450: Pressure sensor abnormal voltage fluctuation
    If the pressure sensor voltage output rapidly fluctuates between less than 0.45 V and more than 4.9 V, the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and stops the EVAP (Evaporative Emission) system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
  2. DTC P0451: Pressure sensor noising or stuck
    If the pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as noise from the 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 for 10 seconds, the ECM interprets this as the sensor being stuck, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.
    (Both the malfunctions are detected by 2 trip detection logic)
  3. DTC P0452: Pressure sensor voltage low
    If the pressure sensor voltage output is below 0.45 V, the ECM interprets this as an open or short circuit malfunction in the 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: Pressure sensor voltage high
    If the pressure sensor voltage output is 4.9 V or more, the ECM interprets this as an open or short circuit malfunction in the 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
Pump module
Frequency of Operation
Once pre driving cycle
Duration
0.5 seconds: P0450, P0452, P0453
Within 15 seconds: P0451
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
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
Atmospheric pressure
70 to 110 kPa (525 to 825 mmHg)
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 (2.25 mmHg) or more
10 times or more in 10 seconds

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 (315.82mmHg), or more than 123.761 kPa (928.207 mmHg)

Pressure sensor low pressure:
EVAP pressure
Less than 42.11 kPa (315.82 mmHg)

Pressure sensor high pressure:
EVAP pressure
More than 123.761 kPa (928.207 mmHg)

WIRING DIAGRAM


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 tank cap. 4Runner


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 tank cap.
  2. Do not disassemble the pump module.
  3. 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.

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

  1. Turn the tester on.

  1. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

  1. Read DTCs.

  1. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / VAPOR PRESS.

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

    Result:

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


Bnext
Go to step 4

Cnext
GO TO EVAP SYSTEM
A
next down

2.CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)
  1. Turn the ignition switch off. 4Runner

  2. Turn the ignition switch off.

  1. Disconnect the E8 ECM connector.

  1. Measure the resistance between PPMP terminal of the ECM connector and the body ground.

    Result:

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

  1. Reconnect the ECM connector.



Bnext
Go to step 8
A
next down

3.CHECK HARNESS AND CONNECTOR (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 between PPMP terminal of the ECM connector and the body ground.

    Result:

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

  1. Reconnect the canister connector.

  1. Reconnect the ECM connector.



Bnext
Go to step 6
A
next down

4.REPLACE CHARCOAL CANISTER ASSEMBLY

  1. Replace charcoal canister assembly (Click here).

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the tester on.

  1. Wait for at least 60 seconds.

  1. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

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

NEXT
next down
COMPLETED

5.CHECK HARNESS AND CONNECTOR (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 and resistance of the L4 canister connector.

    Standard:
    Tester Connections
    		Specified Conditions
    L4-4 - Body ground
    		Between 4.5 V and 5.5 V
    L4-3 - Body ground
    		Between 4.5 V and 5.5 V
    L4-2 - Body ground
    		100 Ω or less

    Result:

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

  1. Reconnect the canister connector.



Bnext
Go to step 7
A
next down

6.REPLACE CHARCOAL CANISTER ASSEMBLY

  1. Replace charcoal canister assembly (Click here).

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the tester on.

  1. Wait for at least 60 seconds.

  1. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

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

NEXT
next down
COMPLETED

7.REPAIR OR REPLACE WIRE HARNESS OR CONNECTORS

  1. Repair or replace wire harness or connectors.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the tester on.

  1. Wait for at least 60 seconds.

  1. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

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

NEXT
next down
COMPLETED

8.REPLACE ECM

  1. Replace the ECM (Click here).

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the tester on.

  1. Wait for at least 60 seconds.

  1. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

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

NEXT
next down
COMPLETED