Toyota Avalon (XX50): Evaporative Emission System Pressure / Intake Air Pressure Signal Compare Failure (P106A62,P106C62). Fuel Rail Pressure Sensor (Low) Circuit Short to Ground (P107A11). Fuel Rail Pressure Sensor (Low)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / A25a-fxs Engine Control / Sfi System / Evaporative Emission System Pressure / Intake Air Pressure Signal Compare Failure (P106A62,P106C62). Fuel Rail Pressure Sensor (Low) Circuit Short to Ground (P107A11). Fuel Rail Pressure Sensor (Low)

Evaporative Emission System Pressure / Intake Air Pressure Signal Compare Failure (P106A62,P106C62)

DESCRIPTION

Those DTCs are designed to detect a deviation in the output characteristics of a pressure sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P106A62	Evaporative Emission System Pressure / Intake Air Pressure Signal Compare Failure	The difference between the pressure of the canister pressure sensor (Vapor Pressure Pump) and manifold absolute pressure sensor (Intake Manifold Absolute Pressure) is higher than 8.69 kPa (1.26 psi) (2 trip detection logic).	Canister pressure sensor (canister pump module) Manifold absolute pressure sensor	Comes on	DTC stored	SAE Code: P106A
P106C62	Evaporative Emission System Pressure/Barometric Pressure Signal Compare Failure	The difference between the pressure of the canister pressure sensor (Vapor Pressure Pump) and atmospheric pressure sensor (Atmospheric Pressure) is higher than 7.89 kPa (1.14 psi) (2 trip detection logic).	Canister pressure sensor (canister pump module) Atmospheric pressure sensor (ECM)	Comes on	DTC stored	SAE Code: P106C

*: Data List name

MONITOR DESCRIPTION

Those DTCs are stored when a deviation from pressure sensor characteristics is detected.

The pressure sensors* are checked approximately 50 minutes after the power switch is turned off. If the pressures detected by the pressure sensors* differ by a certain amount, the MIL is illuminated and a DTC is stored (2 trip detection logic).

HINT:

*: P106A62 checks the canister pressure sensor and the manifold absolute pressure sensor. P106C62 checks the canister pressure sensor and atmospheric pressure sensor.
Correct judgment may not be possible when the altitude is 4000 m (13120 ft.) or more.

MONITOR STRATEGY

Related DTCs	P106A: Canister pressure sensor - manifold absolute pressure sensor rationality P106C: Canister pressure sensor - barometric pressure sensor rationality
Required Sensors/Components (Main)	Canister pressure sensor Atmospheric pressure sensor (ECM) Manifold absolute pressure sensor
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	P106A: Within 65 seconds P106C: -
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

P106A

Monitor runs whenever the following DTCs are not stored	P0106, P0107, P0108 (Manifold absolute pressure) P0401 (EGR system) P0452, P0453 (Evaporative emission system pressure sensor)
Time after power switch off	50 minutes
Time after ECM started by soak-timer	60 seconds or more
Auxiliary battery voltage	8 V or higher
Intake air temperature	-10°C (14°F) or higher
Engine coolant temperature	-10°C (14°F) or higher

P106C

Time after power switch off	50 minutes
Time after ECM started by soak-timer	60 seconds or more
Auxiliary battery voltage	8 V or higher
Intake air temperature	-10°C (14°F) or higher
Engine coolant temperature	-10°C (14°F) or higher
EVAP system pressure sensor malfunction (P0451, P0452, P0453)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

P106A

Difference between canister pressure and manifold absolute pressure

Higher than 8.69 kPa (1.26 psi)

P106C

Difference between canister pressure and atmospheric pressure

Higher than 7.89 kPa (1.14 psi)

CONFIRMATION DRIVING PATTERN

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 power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG).
Turn the Techstream on.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and idle for 10 seconds or more [A].
Turn the power switch off.
Leave the power switch off for 55 minutes [B].
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
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: P106A62 or P106C62.

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.
If the judgment result is INCOMPLETE, perform steps [A] through [C] again.
[A] to [C]: 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 auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)

Click here
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
Click here

HINT:

Refer to "Data List / Active Test" [Atmospheric Pressure, Intake Manifold Absolute Pressure and Vapor Pressure Pump].
Click here
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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P106A62 AND/OR P106C62)

(a) Connect the Techstream to the DLC3.

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

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

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTC P106A62 is output	A
DTC P106C62 is output	B
DTC P106A62 and P106C62 are output	C
DTC P106A62 and/or P106C62 and other DTCs are output	D

HINT:

If any DTCs other than P106A62 and/or P106C62 are output, troubleshoot those DTCs first.

GO TO STEP 3

GO TO STEP 4

GO TO DTC CHART

2.	REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

(a) Replace the manifold absolute pressure sensor.

Click here

GO TO STEP 5

3.	REPLACE ECM (ATMOSPHERIC PRESSURE SENSOR)

(a) Replace the ECM (atmospheric pressure sensor).

Click here

GO TO STEP 5

4.	REPLACE CANISTER PUMP MODULE

(a) Replace the canister pump module.

Click here

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

6.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

(a) Turn the power switch on (IG).

(b) Turn the Techstream on.

(c) Enter the following menus: Powertrain / Engine / Data List / Atmospheric Pressure, Vapor Pressure Pump and Intake Manifold Absolute Pressure.

Powertrain > Engine > Data List

Tester Display
Atmospheric Pressure
Intake Manifold Absolute Pressure
Vapor Pressure Pump

(d) Confirm that the difference between Intake Manifold Absolute Pressure and Vapor Pressure Pump is 8.69 kPa (1.26 psi) or less.

(e) Confirm that the difference between Atmospheric Pressure and Vapor Pressure Pump is 7.89 kPa (1.14 psi) or less.

END

Fuel Rail Pressure Sensor (Low) Circuit Short to Ground (P107A11)

DESCRIPTION

The fuel pressure sensor (for low pressure side) replaces the fuel pressure with electrical signals and outputs them to the ECM. The ECM controls the optimal fuel pressure for the operation conditions to reduce the fuel pump power consumption and improve fuel economy.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P107A11	Fuel Rail Pressure Sensor (Low) Circuit Short to Ground	The fuel pressure sensor (for low pressure side) output voltage is less than 0.43 V for 3 seconds or more (1 trip detection logic).	Open or short in fuel pressure sensor (for low pressure side) circuit Fuel pressure sensor (for low pressure side) ECM	Comes on	DTC stored	SAE Code: P107C

HINT:

When this DTC is output, check the fuel pressure (for low pressure side) in the Data List. Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (Low).

DTC No.	Fuel Pressure (Low)	Malfunction
P107A11	Approximately 0 kPa	Short to ground in PFL circuit Short in PFL to EPFL circuit Open in VCPF circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

Click here

MONITOR DESCRIPTION

This DTC is stored if the fuel pressure sensor (for low pressure side) output voltage is out of the standard range due to an open or short in the sensor circuit.

MONITOR STRATEGY

Related DTCs	P107C: Fuel rail pressure sensor range check (Low voltage)
Required Sensors/Components (Main)	Fuel pressure sensor (for low pressure side)
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	3 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	-
Auxiliary battery voltage	8 V or higher
Power switch	On (IG)
Time after engine start	2 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

Fuel rail pressure sensor voltage

Less than 0.43 V

CONFIRMATION DRIVING PATTERN

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 power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG).
Turn the Techstream on.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
Idle the engine for 10 seconds or more [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
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: P107A11.

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 [A] through [B] again.
[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 auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)

Click here
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
Click here

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 HARNESS AND CONNECTOR

*a	Front view of wire harness connector (to Fuel Pressure Sensor (for Low Pressure Side))

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

(a) Disconnect the fuel pressure sensor (for low pressure side) connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D5-1 (VC) - D5-3 (E2)	Power switch on (IG)	4.75 to 5.25 V
D5-2 (PFL) - D5-3 (E2)	Power switch on (IG)	4.4 to 5.6 V

(d) Turn the power switch off and wait for at least 30 seconds.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D5-1 (VC) - D5-2 (PFL)	Power switch off	171 to 189 kΩ

HINT:

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

Click here

REPLACE FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

2.	CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE) - ECM)

(a) Disconnect the fuel pressure sensor (for low pressure side) connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D5-1 (VC) - C55-84 (VCPF)	Always	Below 1 Ω
D5-2 (PFL) or C55-107 (PFL) - Body ground and other terminals	Always	10 kΩ or higher

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Fuel Rail Pressure Sensor (Low) Circuit Short to Battery or Open (P107A15)

DESCRIPTION

Refer to DTC P107A11.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P107A15	Fuel Rail Pressure Sensor (Low) Circuit Short to Battery or Open	The fuel pressure sensor (for low pressure side) output voltage is higher than 4.85 V for 3 seconds or more (1 trip detection logic).	Open or short in fuel pressure sensor (for low pressure side) circuit Fuel pressure sensor (for low pressure side) ECM	Comes on	DTC stored	SAE Code: P107D

HINT:

When this DTC is output, check the fuel pressure (for low pressure side) in the Data List. Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (Low).

DTC No.	Fuel Pressure (Low)	Malfunction
P107A15	Approximately 750 kPa or higher	Short in VCPF to PFL circuit Open in PFL circuit Open in EPFL circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

Click here

MONITOR DESCRIPTION

This DTC is stored if the fuel pressure sensor (for low pressure side) output voltage is out of the standard range due to an open or short in the sensor circuit.

MONITOR STRATEGY

Related DTCs	P107D: Fuel rail pressure sensor range check (High voltage)
Required Sensors/Components (Main)	Fuel pressure sensor (for low pressure side)
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	3 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Auxiliary battery voltage	8 V or higher
Power switch	On (IG)

TYPICAL MALFUNCTION THRESHOLDS

Fuel rail pressure sensor voltage

Higher than 4.85 V

CONFIRMATION DRIVING PATTERN

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 power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG).
Turn the Techstream on.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
Idle the engine for 10 seconds or more [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
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: P107A15.

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 [A] through [B] again.
[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 auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

Refer to DTC P107A11.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)

Click here
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
Click here

HINT:

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR

*a	Front view of wire harness connector (to Fuel Pressure Sensor (for Low Pressure Side))

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

(a) Disconnect the fuel pressure sensor (for low pressure side) connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D5-1 (VC) - D5-3 (E2)	Power switch on (IG)	4.75 to 5.25 V
D5-2 (PFL) - D5-3 (E2)	Power switch on (IG)	4.4 to 5.6 V

(d) Turn the power switch off and wait for at least 30 seconds.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D5-3 (E2) - Body ground	Power switch off	Below 1 Ω
D5-1 (VC) - D5-2 (PFL)	Power switch off	171 to 189 kΩ

HINT:

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

Click here

REPLACE FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

2.	CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE) - ECM)

(a) Disconnect the fuel pressure sensor (for low pressure side) connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D5-3 (E2) - C55-61 (EPFL)	Always	Below 1 Ω
D5-2 (PFL) - C55-107 (PFL)	Always	Below 1 Ω
D5-2 (PFL) or C55-107 (PFL) - Other terminals	Always	10 kΩ or higher

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Internal Control Module Throttle Position Performance Internal Electronic Failure (P060E49). Internal Control Module EEPROM Data Memory Failure (P062F44). Fuel Pump Control Module Internal Electronic

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