Toyota Avalon (XX50): MIL Circuit. EVAP System Tank Vapor Line Restricted/Blocked (P00FE00). Low Pressure Fuel System Pressure - Too Low (P008A00)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / 2gr-fks Engine Control / Sfi System / MIL Circuit. EVAP System Tank Vapor Line Restricted/Blocked (P00FE00). Low Pressure Fuel System Pressure - Too Low (P008A00)

MIL Circuit

DESCRIPTION

The Malfunction Indicator Lamp (MIL) is used to indicate vehicle malfunctions detected by the ECM.

The MIL operation can be checked visually. When the engine switch is first turned on (IG), the MIL should be illuminated and should then turn off after the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the Techstream.

WIRING DIAGRAM

PROCEDURE

1.	CHECK THAT MIL IS ILLUMINATED

(a) Perform troubleshooting in accordance with the table below.

MIL	Condition	Proceed to
Illuminates → Turns off	Engine switch on (IG) → engine is started	A
Other than above	-	B

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK COMMUNICATION BETWEEN TECHSTREAM AND ECM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

Result	Proceed to
Communication is possible	A
Communication is not possible	B

GO TO VC OUTPUT CIRCUIT

3.	CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: System Select / Health Check.

(e) Check if any DTCs have been detected. Note down any DTCs.

Result	Proceed to
DTCs are not output	A
Any DTCs is output	B

HINT:

Check for detected DTCs output from other ECUs which relate to the MIL.

REPAIR CIRCUIT INDICATED BY OUTPUT

4.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Warning.

Body Electrical > Combination Meter > Active Test

Tester Display
Check Engine Warning

(e) Check the status of the MIL while performing the Active Test.

Result	Proceed to
Changes	A
Does not change	B

REPLACE ECM

REPLACE COMBINATION METER ASSEMBLY

EVAP System Tank Vapor Line Restricted/Blocked (P00FE00)

DTC SUMMARY

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P00FE00	EVAP System Tank Vapor Line Restricted/Blocked	Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. When the fuel level in the fuel tank is 85% or less and the leak detection pump is operating, the EVAP system pressure decreases quickly.	Fuel tank vent hose Fuel tank assembly (cut-off valve, roll over valve) Canister ECM	Comes on	DTC stored	SAE Code: P00FE

DTC No.	Monitoring Item	Detection Timing	Detection Logic	SAE
P00FE00	EVAP vent line blocked	EVAP monitoring (engine switch off)	2 trip	P00FE

DTC No.

Monitoring Item

Detection Timing

Detection Logic

SAE

P00FE00

EVAP vent line blocked

EVAP monitoring

(engine switch off)

2 trip

P00FE

DESCRIPTION

The description can be found in EVAP (Evaporative Emission) System.

Click here

MONITOR DESCRIPTION

5 hours* after the engine switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT:

*: If the engine coolant temperature is not less than 35°C (95°F) 5 hours after the engine switch is turned off, the monitor check starts 2 hours later. If it is still not less than 35°C (95°F) 7 hours after the engine switch is turned off, the monitor check starts 2.5 hours later.

Sequence	Operation	Description	Duration
-	ECM activation	Activated by soak timer 5, 7 or 9.5 hours after engine switch turned off.	-
A	Atmospheric pressure measurement	Vent valve is turned off (vent) and EVAP system pressure is measured by ECM in order to register atmospheric pressure. If pressure in EVAP system is not between 70 to 110 kPa(abs) [10.15 to 15.95 psi(abs)], ECM cancels EVAP system monitor.	60 seconds
B	First reference pressure measurement	In order to determine reference pressure, leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if leak detection pump and vent valve operate normally.	360 seconds
C	EVAP system pressure measurement	Vent valve is turned on (closed) to shut EVAP system. Negative pressure (vacuum) is created in EVAP system, and EVAP system pressure is then measured. Write down measured value as it will be used in leak check. If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.	15 minutes*
D	Purge VSV monitor	Purge VSV is opened and then EVAP system pressure is measured by ECM. Large increase indicates normal.	10 seconds
E	Second reference pressure measurement	After second reference pressure measurement, leak check is performed by comparing first and second reference pressure measurements. If stabilized system pressure is higher than second reference pressure, ECM determines that EVAP system is leaking.	60 seconds
-	Final check	Atmospheric pressure is measured and then monitoring result is recorded by ECM.	-

*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

*1	Purge VSV: Off (Closed)	*2	Purge VSV: On (Open)
*3	Vent Valve: Off (Vent)	*4	Vent Valve: On (Closed)
*5	Leak Detection Pump: Off	*6	Leak Detection Pump: On
*7	Reference Orifice (0.02 inch)	*8	Canister Pressure Sensor
*9	Canister	*10	Fuel Tank
*11	Canister Pump Module	*12	Canister Filter
*a	Operation A: Atmospheric Pressure Measurement	*b	Operation B, E: Reference Pressure Measurement
*c	Operation C: EVAP System Pressure Measurement	*d	Operation D: Purge VSV Monitor
*e	Atmospheric Pressure	*f	Negative Pressure

(a) P00FE00: EVAP vent line blocked
During operation C, if the EVAP system pressure is below the threshold after 38 seconds, the ECM will determine that there is blockage between the fuel tank and canister, illuminate the MIL and store this DTC (2 trip detection logic).

MONITOR STRATEGY

Required Sensors/Components (Main)	Purge VSV Canister pump module
Required Sensors/Components (Related)	Fuel level sensor
Frequency of Operation	Once per driving cycle
Duration	Less than 7 minutes
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Atmospheric pressure	70 kPa(abs) [10.15 psi(abs)] or higher, and less than 110 kPa(abs) [15.95 psi(abs)]
Battery voltage	10.5 V or higher
Vehicle speed	Less than 4 km/h (2.5 mph)
Engine switch	Off
Time after key-off	5, 7 or 9.5 hours
EVAP pressure sensor malfunction (P0452, P0453)	Not detected
Purge VSV	Not operated by scan tool
Vent valve	Not operated by scan tool
Leak detection pump	Not operated by scan tool
Both of the following conditions met before key-off	1 and 2
1. Duration that vehicle is driven	5 minutes or more
2. EVAP purge operation	Performed
Engine coolant temperature	4.4°C (40°F) or higher, and less than 35°C (95°F)
Intake air temperature	4.4°C (40°F) or higher, and less than 35°C (95°F)
Fuel level	85% or less
EVAP system	No leak during this key-off monitoring
Fuel level sensor malfunction (P0461, P0462, P0463)	Not detected
Lost communication with instrument panel cluster control module (U0155)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

Judgment time after reached first 0.020 inch reference pressure (vary with first reference pressure)	38 seconds
EVAP pressure (vary with first reference pressure, atmospheric pressure and engine coolant temperature)	Less than -3.96 kPa(gauge) [0.574 psi(gauge)]

CONFIRMATION DRIVING PATTERN

NOTICE:

The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes.
Do not perform the Evaporative System Check when the fuel tank is higher than 85% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
Do not run the engine during this operation.
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 less than 35°C (95°F).

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) [A].
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [B].
After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P00FE00.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

HINT:

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
[A] to [B]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

PROCEDURE

1.	GO TO EVAP SYSTEM

(a) Refer to EVAP System.

Click here

END

Low Pressure Fuel System Pressure - Too Low (P008A00)

DESCRIPTION

In order to supply the optimal fuel pressure according to the driving conditions and usage environment, the variable fuel system sends a drive signal from the ECM to the fuel pump control ECU assembly, steplessly performing variable control of the fuel pump (for low pressure side) and receiving feedback about the fuel pressure (for low pressure side) from the fuel pressure sensor (for low pressure side).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P008A00	Low Pressure Fuel System Pressure - Too Low	Actual fuel pressure (for low pressure side) value less than target fuel pressure (for low pressure side) by threshold or more (1 trip detection logic).	Leak of fuel Fuel pump control ECU Fuel pressure sensor (for low pressure side) Fuel pump (for low pressure side) Fuel main valve assembly (for high pressure) ECM	Does not come on	DTC stored	SAE Code: P008A

MONITOR DESCRIPTION

If the fuel pressure (for low pressure side) decreases despite an increase request signal being sent to the fuel pump control ECU by the ECM, the ECM will store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) [A].
Turn the Techstream on.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
Drive the vehicle for 15 minutes or more [C].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P008A00.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

HINT:

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system has a malfunction.
If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.	CHECK FUEL LEAK

(a) Check around and beneath the vehicle for fuel leaks, fumes, etc.

OK:

No fuel leaks present.

REPAIR OR REPLACE FUEL LEAK POINT

2.	CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008A00)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTC P008A00 is output	A
DTC P008A00 and other DTCs are output	B

HINT:

If any DTCs other than P008A00 are output, troubleshoot those DTCs first.

GO TO DTC CHART

3.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY RATIO)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio.

Powertrain > Engine > Active Test

Tester Display
Control the Fuel Pump Duty Ratio

(e) Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream.

Standard:

Techstream Operation	Standard
High	Operating sounds can be heard from fuel pump (for low pressure side)

GO TO FUEL PUMP CONTROL CIRCUIT

4.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY RATIO)

(a) Discharge the fuel pressure.

HINT:

DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream.

(1) Remove the EFI-MAIN NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly.

(2) Start the engine.

(3) After the engine has stopped on its own, turn the engine switch off.

HINT:

If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine.

(4) Crank the engine again and make sure that the engine does not start.

(5) Install the EFI-MAIN NO. 2 fuse.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low).

Powertrain > Engine > Active Test

Active Test Display
Control the Fuel Pump Duty Ratio

Data List Display
Fuel Pressure (Low)

(f) Read the value displayed on the Techstream when the Active Test was performed.

Standard:

Techstream Operation	Standard
Low to High	When switching from Low to High, Fuel Pressure (Low) value changes

HINT:

Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High.

GO TO STEP 10

5.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY RATIO)

(a) Discharge the fuel pressure.

HINT:

DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream.

(1) Remove the EFI-MAIN NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly.

(2) Start the engine.

(3) After the engine has stopped on its own, turn the engine switch off.

HINT:

If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine.

(4) Crank the engine again and make sure that the engine does not start.

(5) Install the EFI-MAIN NO. 2 fuse.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low).

Powertrain > Engine > Active Test

Active Test Display
Control the Fuel Pump Duty Ratio

Data List Display
Fuel Pressure (Low)

(f) Read the value displayed on the Techstream when the Active Test was performed.

Standard:

Techstream Operation	Fuel Pressure (Low)
Low	50 kPag or higher
High	420 kPag or higher

HINT:

OK:

Actual Low and High values are as shown above.

GO TO STEP 9

6.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY RATIO)

(a) Install the fuel pressure gauge (for low pressure line of low pressure side).

Click here

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low).

Powertrain > Engine > Active Test

Active Test Display
Control the Fuel Pump Duty Ratio

Data List Display
Fuel Pressure (Low)

(f) Compare the values in the Data List using the Techstream and the fuel pressure gauge when the Active Test was performed.

Standard:

Techstream Operation	Result
Low	Data List value and fuel pressure gauge are within +/-50 kPa of each other
High

HINT:

Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side).

Click here

REPLACE FUEL DELIVERY PIPE RH (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE))

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Clear the DTC.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

8.	CHECK WHETHER DTC OUTPUT RECURS (DTC P008A00)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

(d) Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P008A00 is output)

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

9.	READ VALUE USING TECHSTREAM (FUEL PRESSURE (LOW))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Start the engine.

(e) Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (Low).

Powertrain > Engine > Data List

Tester Display
Fuel Pressure (Low)

(f) Record the Fuel Pressure (Low) value.

(g) Turn the engine switch off.

(h) Wait for 10 seconds.

(i) Turn the engine switch on (IG).

(j) Turn the Techstream on.

(k) Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (Low).

Powertrain > Engine > Data List

Tester Display
Fuel Pressure (Low)

(l) Compare the Fuel Pressure (Low) value recorded with the engine running to the Fuel Pressure (Low) value currently shown on the Techstream.

Result	Proceed to
Fuel Pressure (Low) value is maintained	A
Fuel Pressure (Low) value drops	B

HINT:

Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

Click here

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

REPLACE FUEL MAIN VALVE ASSEMBLY (FOR HIGH PRESSURE)

10.	PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY RATIO)

(a) Install the fuel pressure gauge (for low pressure line of low pressure side).

Click here

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low).

Powertrain > Engine > Active Test

Active Test Display
Control the Fuel Pump Duty Ratio

Data List Display
Fuel Pressure (Low)

(f) Read the values in the Data List using the Techstream and the fuel pressure gauge when the Active Test was performed.

Techstream Operation	Result	Proceed to
Low to High	Data List value does not change, but fuel pressure gauge changes	A
Low to High	Data List value and fuel pressure gauge do not change	B

HINT:

Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side).

Click here

REPLACE FUEL DELIVERY PIPE RH (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE))

REPLACE FUEL PUMP CONTROL ECU

How To Proceed With Troubleshooting. Initialization. Lack of Power

Low Pressure Fuel System Pressure - Too High (P008B00). Engine Coolant Temperature / Intake Air Temperature Signal Compare Failure (P011B62). Bank 1 Air-Fuel Ratio Imbalance (Port) (P11EA00-P11EF00,P1

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Seat Belt: Seat Belt Warning System(for Gasoline Model)
Customize Parameters CUSTOMIZE PARAMETERS CUSTOMIZE SEAT BELT WARNING SYSTEM NOTICE: When the customer requests a change in a function, first make sure that the function can be customized. Be sure to make a note of the current settings before customizing. When troubleshooting a function, first make ...