Toyota Avalon (XX50): Throttle Actuator "A" Control Throttle Body Range/Performance (P211900,P211904,P211977,P21199B)

DESCRIPTION

The electronic throttle control system is composed of the throttle actuator, throttle position sensor, and ECM. The ECM operates the throttle actuator to regulate the throttle valve in response to a request from the hybrid system. The throttle position sensor detects the opening angle of the throttle valve, and provides the ECM with feedback so that the throttle valve can be appropriately controlled by the ECM.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P211900	Throttle Actuator "A" Control Throttle Body Range/Performance	The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic).	Electronic throttle control system Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P2119
P211904	Throttle Actuator "A" Control Throttle Body Range/Performance System Internal Failure	The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic).	Electronic throttle control system Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P2119
P211977	Throttle Actuator "A" Control Throttle Body Range/Performance Commanded Position Not Reachable	The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic).	Electronic throttle control system Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P2119
P21199B	Throttle Actuator "A" Control Throttle Body High/Excessive Flow	The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic).	Electronic throttle control system Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P2119

MONITOR DESCRIPTION

The ECM determines the actual opening angle of the throttle valve from the throttle position sensor signal. The actual opening angle is compared to the target opening angle commanded by the ECM. If the difference between these two values is outside the standard range, the ECM interprets this as a malfunction in the electronic throttle control system, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	P2119: Electronic throttle control system malfunction
Required Sensors/Components (Main)	Throttle actuator (throttle body with motor assembly)
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	1 second: Closed 0.6 seconds: Open
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

System guard* judge condition

On

*: System guard is on when the following conditions are met	-
Throttle actuator	On
Throttle actuator duty calculation	Executing
Throttle position sensor fail (P0121, P0122, P0123, P0222, P0223, P2135)	Not detected
Throttle actuator current-cut operation	Not executing
Throttle actuator power supply	4 V or higher
Throttle actuator fail (P2102)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met	1 or 2
1. Difference between commanded closed throttle position and current closed throttle position	0.3 V or higher
2. Difference between commanded open throttle position and current open throttle position	0.3 V or higher

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.

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• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

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1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the power switch on (IG) [A].
7. Turn the Techstream on.
8. Put the engine in Inspection Mode (Maintenance Mode).

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9. Start the engine.
10. Idle the engine for 20 seconds.
11. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
12. 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.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Input the DTC: P211900, P211904, P211977 or P21199B.
15. 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, fully depress and release the accelerator pedal 3 times, and then check the DTC judgment result [C].
    • [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.

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 then turned off.

WIRING DIAGRAM

Refer to DTC P210014.

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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.

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

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• 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.

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HINT:

• Refer to "Data List / Active Test" [Throttle Position Sensor No.1 Voltage, Throttle Position Sensor No.2 Voltage, Throttle Position Command, Throttle Motor Current, Throttle Motor Duty Ratio (Open) and Throttle Motor Duty Ratio (Close)].

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• 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 P211900, P211904, P211977 OR P21199B)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTC P211900, P211904, P211977 or P21199B is output	A
DTC P211900, P211904, P211977 or P21199B and other DTCs are output	B

HINT:

If any DTCs other than P211900, P211904, P211977 or P21199B are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

NEXT

3.	READ VALUE USING TECHSTREAM (THROTTLE POSITION)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.1 Voltage and Throttle Position Command.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage
Throttle Position Command

(e) Read the values displayed on the Techstream while fully depressing and releasing the accelerator pedal quickly.

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 this step after charge control has completed.

Result	Proceed to
Throttle Position Sensor No.1 Voltage does not change	A
Throttle Position Sensor No.1 Voltage changes even a little	B

HINT:

When a DTC is output, the system changes to fail-safe mode. Therefore, only use the data up until the time the DTC is stored for confirmation.

B

GO TO STEP 5

A

4.	INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)

(a) Inspect the throttle body with motor assembly.

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NG

GO TO STEP 9

OK

5.	INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body with motor assembly. Also, check that the throttle valve moves smoothly.

OK:

Throttle valve is not contaminated with foreign matter and moves smoothly.

HINT:

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

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NG

GO TO STEP 9

OK

6.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

NEXT

7.	READ VALUE USING TECHSTREAM (THROTTLE POSITION)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.1 Voltage, Throttle Position Sensor No.2 Voltage and Throttle Position Command.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage
Throttle Position Sensor No.2 Voltage
Throttle Position Command

(e) Read the values displayed on the Techstream while wiggling the ECM wire harness.

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

(g) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
Value in Data List changes when wire harness is wiggled, or DTC is output	A
Other than above	B

B

GO TO STEP 10

A

8.	REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE BODY WITH MOTOR ASSEMBLY - ECM)

(a) As the DTC was stored due to a change in the contact resistance of the connector, repair or replace the wire harness or connector.

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NEXT

END

9.	REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

(a) Replace the throttle body with motor assembly.

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HINT:

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

Click here

NEXT

10.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

NEXT

11.	CHECK WHETHER DTC OUTPUT RECURS (DTC P211900, P211904, P211977 OR P21199B)

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

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

(c) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC P211900, P211904, P211977 or P21199B is output	B

A

END

B

REPLACE ECM