Toyota Venza: Throttle Actuator Control Motor Circuit Low (P2102,P2103)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Throttle Actuator Control Motor Circuit Low (P2102,P2103)

DESCRIPTION

The throttle actuator is operated by the ECM and opens and closes the throttle valve using gears.

The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT:

This Electronic Throttle Control System (ETCS) does not use a throttle cable.

DTC No.	DTC Detection Condition	Trouble Area
P2102	Both of the following conditions continue for 2 seconds (1 trip detection logic): (a) The throttle actuator drive duty ratio is 80% or more. (b) The throttle actuator current is below 0.5 A.	Open in throttle actuator circuit Throttle actuator ECM
P2103	Either of the following conditions is met (1 trip detection logic): A motor driver IC high current limiter monitor input failure. A motor driver IC high current inhibit signal on.	Short in throttle actuator circuit Throttle actuator Throttle valve Throttle body ECM

DTC No.

DTC Detection Condition

Trouble Area

P2102

Both of the following conditions continue for 2 seconds (1 trip detection logic):

(a) The throttle actuator drive duty ratio is 80% or more.

(b) The throttle actuator current is below 0.5 A.

Open in throttle actuator circuit
Throttle actuator
ECM

P2103

Either of the following conditions is met (1 trip detection logic):

A motor driver IC high current limiter monitor input failure.
A motor driver IC high current inhibit signal on.

Short in throttle actuator circuit
Throttle actuator
Throttle valve
Throttle body
ECM

MONITOR DESCRIPTION

The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this value. If the current is outside the standard range, the ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and stores a DTC.

Example:
- When the electrical current is below 0.5 A and the throttle actuator duty ratio exceeds 80%, the ECM interprets this as the current being outside the standard range, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	P2102: Electronic Throttle Actuator Control Motor Range Check (Low Current) P2103: Electronic Throttle Actuator Control Motor Range Check (High Current)
Required Sensors/Components (Main)	Throttle actuator (throttle body)
Required Sensors/Components (Related)	None
Frequency of Operation	Continuous
Duration	P2102: 2 seconds P2103 (Case 1): 25 times P2103 (Case 2): 0.6 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None

P2102

All of the following conditions are met	-
Command to electronic throttle actuator	ON
Output duty cycle	80% or more
Electronic throttle actuator power supply voltage	8 V or higher
Motor current change during last 0.016 seconds	Below 0.2 A

P2103

All of the following conditions are met	-
Command to electronic throttle actuator	ON
Either of the following conditions is met:	1 or 2
1. Electronic throttle actuator power supply voltage	8 V or higher
2. Command to electronic throttle actuator power	ON
Battery voltage	8 V or more
Starter	Off

TYPICAL MALFUNCTION THRESHOLDS

P2102

Monitor current

Below 0.5 A

P2103 (Case 1)

Motor driver IC high current limiter monitor input

Fail

P2103 (Case 2)

Motor driver IC high current inhibit signal

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).

Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the Techstream on [A].
Start the engine.
With the vehicle stationary, fully depress the accelerator pedal and quickly release it [B].
Check that 16 seconds or more have elapsed from the instant when the accelerator pedal is first depressed.
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: P2102 or P2103.

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
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [C] again.

If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, 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 6° throttle 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 ignition switch is then turned off.

WIRING DIAGRAM

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.	INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE ACTUATOR)

(a) Inspect the throttle body (See page ).

HINT:

Perform "Inspection After Repair" after replacing the throttle body (See page ).

REPLACE THROTTLE BODY

2.	CHECK HARNESS AND CONNECTOR (THROTTLE BODY - ECM)

(a) Disconnect the throttle body connector.

(b) Disconnect the ECM connector.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
B1-2 (M+) - B58-21 (M+)	Always	Below 1 Ω
B1-1 (M-) - B58-20 (M-)	Always	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
B1-2 (M+) or B58-21 (M+) - Body ground	Always	10 kΩ or higher
B1-1 (M-) or B58-20 (M-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for foreign objects between the throttle valve and the housing.

OK:

No foreign objects between the throttle valve and housing.

HINT:

Perform "Inspection After Repair" after cleaning the throttle body (See page ).

REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY

4.	INSPECT THROTTLE BODY (THROTTLE VALVE)

(a) Check if the throttle valve opens and closes smoothly.

OK:

Throttle valve opens and closes smoothly.

HINT:

Perform "Inspection After Repair" after replacing the throttle body (See page ).

REPLACE ECM

REPLACE THROTTLE BODY

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