2Az-Fe Engine Control. Dtc P2102 Throttle Actuator Control Motor Circuit Low

The throttle actuator is operated by the ECM and opens and closes the throttle valve using an electric motor and 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 does not use a throttle cable.

DTC No.	DTC Detection Condition	Trouble Area
P2102	Both of the following conditions continue for 2.0 seconds (1 trip detection logic): (a) The throttle actuator drive duty cycle is 80% or higher. (b) The throttle actuator current is less than 0.5 A.	Open in throttle actuator circuit Throttle actuator ECM
P2103	Either of the following conditions is met (1 trip detection logic): A hybrid IC diagnosis signal failure. A hybrid IC high current limiter monitor input failure.	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 less than 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: Throttle actuator control motor current (low current) P2103: Throttle actuator control motor current (high current)
Required Sensors/Components (Main)	Throttle actuator (throttle body)
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	2 seconds: P2102 25 times: P2103 (case 1) 0.6 seconds: P2103 (case 2)
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs are not present

None

P2102:
Throttle actuator	ON
Duty-cycle to open throttle actuator	80% or more
Throttle actuator power supply	8 V or more
Motor current change during latest 0.016 seconds	Less than 0.2 A

P2103:
Throttle actuator	ON
Either of the following conditions 1 or 2 is met:	-
1. Throttle actuator power supply	8 V or more
2. Throttle actuator power	ON

TYPICAL MALFUNCTION THRESHOLDS

P2102:
Throttle actuator current	Less than 0.5 A

P2103:
Either of following conditions is met:	A or B
A. Hybrid IC diagnosis signal	Fail
B. Hybrid IC current limiter port	Fail

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to electronic throttle control system malfunctions, is set, 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 6.5° 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 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.

CONFIRMATION DRIVING PATTERN

Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.
Dtc
P2102 Throttle Actuator Control Motor Circuit Low

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).
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 and ECT / Trouble Codes [C].
Read the pending DTCs.
HINT:
1. If a pending DTC is output, the system is malfunctioning.
2. If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine and ECT / 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] and [C] again.

If no pending DTC is output, perform a universal trip and check for permanent DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).
HINT:
1. If a permanent DTC is output, the system is malfunctioning.
2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Duty (Open) / Throttle Motor Duty (Close)) can be read using Techstream. However, the ECM shuts off the throttle actuator current when the electronic throttle control system malfunctions.

1.INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE ACTUATOR)

Inspect the throttle body (COROLLA_ZRE142 RM0000017UB03FX.html).

REPLACE THROTTLE BODY (COROLLA_ZRE142 RM0000017UC03CX.html)

OK

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

Disconnect the throttle body connector.

Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Tester Connection
Condition
Specified Condition
B25-2 (M+) - B31-42 (M+)
Always
Below 1 Ω
B25-1 (M-) - B31-41 (M-)
Always
Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection
Condition
Specified Condition
B25-2 (M+) or B31-42 (M+) - Body ground
Always
10 kΩ or higher
B25-1 (M-) or B31-41 (M-) - Body ground
Always
10 kΩ or higher

Reconnect the ECM connector.

Reconnect the throttle body connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE BODY - ECM)

OK

3.INSPECT THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE)

Check for foreign objects between the throttle valve and the housing.
OK:
No foreign objects between throttle valve and housing.

REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY

OK

4.INSPECT THROTTLE BODY (THROTTLE VALVE)

Check if the throttle valve opens and closes smoothly.
OK:
Throttle valve opens and closes smoothly.

REPLACE THROTTLE BODY (COROLLA_ZRE142 RM0000017UC03CX.html)

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)

Tester Connection	Condition	Specified Condition
B25-2 (M+) - B31-42 (M+)	Always	Below 1 Ω
B25-1 (M-) - B31-41 (M-)	Always	Below 1 Ω