Toyota Avalon (XX50): Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground (P022011). Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open (P022015). Evaporative Emission System Switching

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / A25a-fxs Engine Control / Sfi System / Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground (P022011). Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open (P022015). Evaporative Emission System Switching

Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground (P022011)

DESCRIPTION

Refer to DTC P012011.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P022011	Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground	The output voltage of VTA2 is less than 2.05 V for 2 seconds or more (1 trip detection logic).	Throttle position sensor (throttle body with motor assembly) Short in VTA2 circuit Open in VCTA circuit ECM	Comes on	DTC stored	SAE Code: P0222

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. If the VTA2 terminal voltage is less than the threshold, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Related DTCs	P0222: Throttle position sensor 2 range check (low voltage)
Required Sensors/Components (Main)	Throttle position sensor
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	2 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

VTA2 voltage

Less than 2.05 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.
With the vehicle stationary, fully depress and release the accelerator pedal [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Idle the engine for 2 seconds or more [C].
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: P022011.

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 [B] through [D] again.
[A] to [D]: 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.

FAIL-SAFE

When this DTC is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 7.5° throttle valve opening angle by the return spring. The ECM then adjusts the engine output, by controlling the fuel injection (intermittent fuel cut) and ignition timing, in accordance with the engine torque request signal sent from the hybrid vehicle control ECU assembly, to allow the vehicle to continue being driven at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the power switch is turned off.

WIRING DIAGRAM

Refer to DTC P012011.

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:

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.	READ VALUE USING TECHSTREAM (THROTTLE POSITION SENSOR NO.2 VOLTAGE)

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.2 Voltage.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.2 Voltage

(e) Read the values displayed on the Techstream.

(f) Disconnect the throttle body with motor assembly connector.

(g) Compare the value of the Data List item Throttle Position Sensor No.2 Voltage after disconnecting the throttle body with motor assembly connector to the value when the connector was connected.

Result	Proceed to
Changes from less than 2.05 V to higher than 4.75 V	A
Does not change from less than 2.05 V	B

HINT:

Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

Click here

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

(a) Disconnect the throttle body with motor assembly connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C25-2 (VC) - C55-109 (VCTA)	Always	Below 1 Ω
C25-3 (VTA2) or C55-87 (VTA2) - Body ground	Always	10 kΩ or higher

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open (P022015)

DESCRIPTION

Refer to DTC P012011.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P022015	Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open	The output voltage of VTA2 is higher than 4.75 V, and VTA1 is less than 2.367 V for 2 seconds or more (1 trip detection logic).	Throttle position sensor (throttle body with motor assembly) Open in VTA2 circuit Short between VCTA and VTA2 circuits ECM	Comes on	DTC stored	SAE Code: P0223

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. If the VTA2 terminal voltage is higher than the threshold, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Related DTCs	P0223: Throttle position sensor 2 range check (high voltage)
Required Sensors/Components (Main)	Throttle position sensor
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	2 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

VTA2 voltage when VTA1 less than 2.367 V

Higher than 4.75 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) [A].
Turn the Techstream on.
Put the engine in Inspection Mode (Maintenance Mode).
Start the engine.
With the vehicle stationary, fully depress and release the accelerator pedal [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Idle the engine for 2 seconds or more [C].
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: P022015.

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 [B] through [D] again.
[A] to [D]: 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.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the power switch is turned off.

WIRING DIAGRAM

Refer to DTC P012011.

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 (THROTTLE POSITION SENSOR - ECM)

(a) Disconnect the throttle body with motor assembly connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C25-3 (VTA2) - C55-87 (VTA2)	Always	Below 1 Ω
C25-2 (VC) or C55-109 (VCTA) - Other terminals	Always	10 kΩ or higher
C25-3 (VTA2) or C55-87 (VTA2) - Other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF THROTTLE POSITION SENSOR)

*a	Front view of wire harness connector (to Throttle Body with Motor Assembly)

(a) Disconnect the throttle body with motor assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
C25-2 (VC) - C25-4 (E2)	Power switch on (IG)	4.5 to 5.5 V
C25-3 (VTA2) - C25-4 (E2)	Power switch on (IG)	3.0 to 5.0 V

REPLACE ECM

3.	CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM)

(a) Disconnect the throttle body with motor assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C25-2 (VC) - C25-3 (VTA2)	Power switch off	190 to 210 kΩ

REPLACE ECM

4.	READ VALUE USING TECHSTREAM (THROTTLE POSITION SENSOR NO.2 VOLTAGE)

*a	Front view of wire harness connector (to Throttle Body with Motor Assembly)

(a) Disconnect the throttle body with motor assembly connector.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.2 Voltage.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.2 Voltage

(f) According to the display on the Techstream, read the Data List.

HINT:

Use the snapshot function to record the value displayed or make a note of it.

(g) Turn the power switch off.

(h) Turn the Techstream off.

(i) Connect terminals 3 (VTA2) and 4 (E2) of the throttle body with motor assembly connector on the wire harness side.

NOTICE:

If the VTA2 terminal voltage or the resistance between VTA2 and E2 is abnormal and terminals 3 (VTA2) and 4 (E2) of the throttle body with motor assembly connector are connected, excessive current may flow through the circuit. In this case, do not connect the terminals.

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

(k) Turn the Techstream on.

(l) Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.2 Voltage.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.2 Voltage

(m) Compare the vehicle of the Data List item Throttle Position Sensor No.2 Voltage after the circuit is shorted to the value when the throttle body with motor assembly connector was connected.

Result	Proceed to
Changes from higher than 4.75 V to less than 2.05 V	A
Does not change from higher than 4.75 V	B

HINT:

Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

Click here

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

REPLACE ECM

Evaporative Emission System Switching Valve Control Circuit Actuator Stuck Off (P24187F)

DTC SUMMARY

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P24187F	Evaporative Emission System Switching Valve Control Circuit Actuator Stuck Off	Following condition is met during key-off EVAP monitor: EVAP pressure change when vent valve closed (on) less than 0.3 kPa [0.04 psi]	Canister pump module (reference orifice, leak detection pump, vent valve) Connector/wire harness (Canister pump module - ECM) Canister (filter inside canister clogged) ECM	Comes on	DTC stored	SAE Code: P2420

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P24187F

Evaporative Emission System Switching Valve Control Circuit Actuator Stuck Off

Following condition is met during key-off EVAP monitor:

EVAP pressure change when vent valve closed (on) less than 0.3 kPa [0.04 psi]

Canister pump module (reference orifice, leak detection pump, vent valve)
Connector/wire harness (Canister pump module - ECM)
Canister (filter inside canister clogged)
ECM

Comes on

DTC stored

SAE Code: P2420

DTC No.	Monitoring Item	Detection Timing	Detection Logic	SAE Code
P24187F	Vent valve stuck open (vent)	EVAP monitoring (power switch off)	2 trip	P2420

DTC No.

Monitoring Item

Detection Timing

Detection Logic

SAE Code

P24187F

Vent valve stuck open (vent)

EVAP monitoring

(power switch off)

2 trip

P2420

HINT:

The vent valve is built into the canister pump module.

DESCRIPTION

Refer to EVAP (Evaporative Emission) System.

Click here

MONITOR DESCRIPTION

P24187F: Vent valve stuck open (vent)

In operation C, the vent valve turns on (closed) and the EVAP system pressure is then measured by the ECM using the canister pressure sensor to conduct an EVAP leak check. If the pressure does not increase when the vent valve is open, the ECM interprets this as the vent valve being stuck open. In this case the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

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

TYPICAL ENABLING CONDITIONS

Key-off monitor runs when all of the following conditions are met	-
Atmospheric pressure	70 kPa(abs) [10.2 psi(abs)] or higher, and less than 110 kPa(abs) [16 psi(abs)]
Auxiliary battery voltage	10.5 V or higher
Vehicle speed	Less than 4 km/h (2.5 mph)
Power switch	Off
Engine condition	Not running
Key-OFF duration	5, 7 or 9.5 hours
Pressure sensor of canister pump module malfunction (P0451, P0452, P0453)	Not detected
Fuel tank pressure sensor malfunction (P1451, P1452, P1453)	Not detected
Purge VSV	Not operated by scan tool
Vent valve	Not operated by scan tool
Fuel vapor-containment valve	Not operated by scan tool
Leak detection pump	Not operated by scan tool
Purge flow before key-OFF	Performed
Engine coolant temperature	4.4°C (39.9°F) or higher, and less than 35°C (95°F)
Intake air temperature	4.4°C (39.9°F) or higher, and less than 35°C (95°F)

TYPICAL MALFUNCTION THRESHOLDS

EVAP pressure change after EVAP canister vent valve on (closed)

Less than 0.3 kPa [0.04 psi]

MONITOR RESULT

Refer to EVAP system.

Click here

CONFIRMATION DRIVING PATTERN

NOTICE:

The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the Techstream. It takes a maximum of approximately 40 minutes.
Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
Do not start the engine during this operation.
When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor will from and any check result will be 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 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) [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: P24187F.

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 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

PROCEDURE

1.	GO TO EVAP SYSTEM

(a) Refer to EVAP system.

Click here

END

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