Dtc P2102 Throttle Actuator Control Motor Circuit Low

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 3UR-FE ENGINE CONTROL

DESCRIPTION

MONITOR DESCRIPTION

FAIL-SAFE

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)

CHECK HARNESS AND CONNECTOR (THROTTLE ACTUATOR - ECM)

INSPECT THROTTLE BODY ASSEMBLY

INSPECT THROTTLE VALVE

DTC P2102 Throttle Actuator Control Motor Circuit Low

DTC P2103 Throttle Actuator Control Motor Circuit High

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 (TP) sensor, which is mounted on the throttle body. The TP 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 ETCS (Electronic Throttle Control System) does not use a throttle cable.
DTC CodeDTC Detection ConditionTrouble Area
P2102Conditions (a) and (b) continue for 2.0 seconds (1 trip detection logic):
(a) The throttle actuator duty ratio is 80% or more.
(b) The throttle actuator current is below 0.5 A.
Open in throttle actuator circuit
Throttle actuator
ECM
P2103Either of the following conditions is met (1 trip detection logic):
A hybrid IC diagnosis signal failure.
A hybrid IC current limiter port failure.
Short in throttle actuator circuit
Throttle actuator
Throttle valve
Throttle body assembly
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 DTC(s).


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 DTC(s).


If the malfunction is not repaired successfully, a DTC is stored when the engine is quickly revved to a high rpm several times after the engine is started and has idled for 5 seconds.


FAIL-SAFE

When either of these DTCs, or other DTCs relating to ETCS (Electronic Throttle Control System) 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 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 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

Dtc P2102 Throttle Actuator Control Motor Circuit Low. 3UR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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.
The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Open Duty / Throttle Motor Close Duty) can be read using the intelligent tester. However, the ECM shuts off the throttle actuator current when the ETCS malfunctions.
1.INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)
Dtc P2102 Throttle Actuator Control Motor Circuit Low. 3UR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the C3 throttle body connector.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    2 (M+) - 1 (M-)20°C (68°F)0.3 to 100 Ω
NG
REPLACE THROTTLE BODY ASSEMBLY ()
OK
2.CHECK HARNESS AND CONNECTOR (THROTTLE ACTUATOR - ECM)
Dtc P2102 Throttle Actuator Control Motor Circuit Low. 3UR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the C3 throttle body connector.

Disconnect the C45 ECM connector.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    C3-2 (M+) - C45-19 (M+)AlwaysBelow 1 Ω
    C3-1 (M-) - C45-18 (M-)AlwaysBelow 1 Ω
    C3-2 (M+) or C45-19 (M+) - Body groundAlways10 kΩ or higher
    C3-1 (M-) or C45-18 (M-) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.INSPECT THROTTLE BODY ASSEMBLY

Check for foreign objects between the throttle valve and the housing.

  • OK:
  • No foreign objects between throttle valve and housing.
NG
REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
OK
4.INSPECT THROTTLE VALVE

Check if the throttle valve opens and closes smoothly.

  • OK:
  • Throttle valve opens and closes smoothly.
NG
REPLACE THROTTLE BODY ASSEMBLY ()
OK
REPLACE ECM ()