Lexus ES: Throttle Actuator "A" Control Throttle Body Range/Performance (P211900,P211904,P211977)

DESCRIPTION

The electronic throttle control system is composed of the throttle actuator, throttle position sensor, accelerator pedal position sensor, and ECM. The ECM operates the throttle actuator to regulate the throttle valve in response to driver inputs. 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

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 a 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	Not detected
Throttle actuator current-cut operation	Not executing
Throttle actuator power supply	4 V or higher
Throttle actuator fail	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

FAIL-SAFE

When any of these DTCs or other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions are 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° 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 accelerator pedal opening angle, to allow the vehicle to continue running 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 engine switch is then turned off.

WIRING DIAGRAM

Refer to DTC P210018.

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CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P211900, P211904 OR P211977)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine 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 or P211977 is output	A
DTC P211900, P211904 or P211977 and other DTCs are output	B

HINT:

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

B

GO TO DTC CHART

A

2.	READ FREEZE FRAME DATA (VVT CHANGE ANGLE, VVT TARGET ANGLE AND VVT OCV CONTROL DUTY RATIO)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

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for Intake Camshaft of Bank 1:

Freeze Frame Data Item	Result	Proceed to
Intake VVT Change Angle Bank 1 and Intake VVT Target Angle Bank 1	Difference between Intake VVT Change Angle Bank 1 and Intake VVT Target Angle Bank 1 is +/- 5 DegFR or more*1	A
Intake VVT OCV Control Duty Ratio Bank 1	0% or 100% is displayed*2
Both freeze frame data items listed above	Values are other than above	C

HINT:

If *1 or *2 is applicable, the malfunction may be caused by Intake VVT System Bank 1 being over-retarded or over-advanced, so perform inspection following the procedures for DTC P001100 (Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 1) and P001200 (Camshaft Position "A" - Timing Over-Retarded Bank 1).

for Intake Camshaft of Bank 2:

Freeze Frame Data Item	Result	Proceed to
Intake VVT Change Angle Bank 2 and Intake VVT Target Angle Bank 2	Difference between Intake VVT Change Angle Bank 2 and Intake VVT Target Angle Bank 2 is +/- 5 DegFR or more*3	A
Intake VVT OCV Control Duty Ratio Bank 2	0% or 100% is displayed*4
Both freeze frame data items listed above	Values are other than above	C

HINT:

If *3 or *4 is applicable, the malfunction may be caused by Intake VVT System Bank 2 being over-retarded or over-advanced, so perform inspection following the procedures for DTC P002100 (Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 2) and P002200 (Camshaft Position "A" - Timing Over-Retarded Bank 2).

for Exhaust Camshaft of Bank 1:

Freeze Frame Data Item	Result	Proceed to
Exhaust VVT Change Angle Bank 1 and Exhaust VVT Target Angle Bank 1	Difference between Exhaust VVT Change Angle Bank 1 and Exhaust VVT Target Angle Bank 1 is +/- 5 DegFR or more*5	B
Exhaust VVT OCV Control Duty Ratio Bank 1	0% or 100% is displayed*6
Both freeze frame data items listed above	Values are other than above	C

HINT:

If *5 or *6 is applicable, the malfunction may be caused by Exhaust VVT System Bank 1 being over-retarded or over-advanced, so perform inspection following the procedures for DTC P001400 (Camshaft Position "B" - Timing Over-Advanced or System Performance Bank 1) and P001500 (Camshaft Position "B" - Timing Over-Retarded Bank 1).

for Exhaust Camshaft of Bank 2:

Freeze Frame Data Item	Result	Proceed to
Exhaust VVT Change Angle Bank 2 and Exhaust VVT Target Angle Bank 2	Difference between Exhaust VVT Change Angle Bank 2 and Exhaust VVT Target Angle Bank 2 is +/- 5 DegFR or more*7	B
Exhaust VVT OCV Control Duty Ratio Bank 2	0% or 100% is displayed*8
Both freeze frame data items listed above	Values are other than above	C

HINT:

If *7 or *8 is applicable, the malfunction may be caused by Exhaust VVT System Bank 2 being over-retarded or over-advanced, so perform inspection following the procedures for DTC P002400 (Camshaft Position "B" - Timing Over-Advanced or System Performance Bank 2) and P002500 (Camshaft Position "B" - Timing Over-Retarded Bank 2).

A

GO TO VVT SYSTEM INSPECTION PROCEDURE (DTC P001100)

B

GO TO VVT SYSTEM INSPECTION PROCEDURE (DTC P001400)

C

3.	READ VALUE USING TECHSTREAM (THROTTLE POSITION)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

(f) Start the engine.

(g) Turn the Techstream on.

(h) 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

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

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 8

OK

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

(a) Check for contamination 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 8

OK

6.	READ VALUE USING TECHSTREAM (THROTTLE POSITION)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

(f) Turn the engine switch on (IG) and turn the Techstream on.

(g) 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

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

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

(j) 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 9

A

7.	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

8.	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

9.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTC.

Powertrain > Engine > Clear DTCs

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

NEXT

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

(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 or P211977 is output	B

A

END

B

REPLACE ECM

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