Dtc P2102 Throttle Actuator Control Motor Circuit Low

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Engine Control System. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

FAIL-SAFE

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE CONTROL MOTOR)

CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)

INSPECT THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE)

INSPECT THROTTLE BODY (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 No.
DTC Detection Condition
Trouble Area
P2102
Conditions (a) and (b) continue for 2.0 seconds (1 trip detection logic):
(a) Throttle actuator duty ratio 80 % or more
(b) Throttle actuator current 0.5 A or less
  1. Open in throttle actuator circuit
  2. Throttle actuator
  3. ECM
P2103
Either of following conditions met:
  1. Hybrid IC diagnosis signal fail
  2. Hybrid IC current limiter port fail
  1. Open in throttle actuator circuit
  2. Throttle actuator
  3. ECM

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to ETCS (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 off, 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 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


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Engine Control System.Sfi System. Dtc P2102 Throttle Actuator Control Motor Circuit Low


INSPECTION PROCEDURE

HINT:
  1. Read freeze frame data using an intelligent tester. Freeze frame data records the engine conditions 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 (Click here).
  1. The throttle actuator current (THROTTLE MOT) and the throttle actuator duty ratio (THROTTLE OPN / THROTTLE CLS) can be read using the intelligent tester. However the ECM shuts off the throttle actuator current when the ETCS malfunctions.
1.INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE CONTROL MOTOR)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Engine Control System.Sfi System. Dtc P2102 Throttle Actuator Control Motor Circuit Low

  1. Disconnect the E17 throttle body connector.

  1. Measure the resistance of the throttle control motor.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    M+ (E17-2) - M- (E17-1)
    		20°C (68°F)
    		0.3 to 100 Ω

  1. Reconnect the throttle body connector.



NG
REPLACE THROTTLE BODY
OK


2.CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Engine Control System.Sfi System. Dtc P2102 Throttle Actuator Control Motor Circuit Low

  1. Disconnect the E17 throttle body connector.

  1. Disconnect the E3 ECM connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    M+ (E17-2) - M+ (E3-2)
    		Below 1 Ω
    M- (E17-1) - M- (E3-1)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    M+ (E17-2) or M+ (E3-2) - Body ground
    		10 kΩ or higher
    M- (E17-1) or M- (E3-1) - Body ground
    		10 kΩ or higher

  1. Reconnect the throttle body connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE)

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



NG
CLEAN THROTTLE BODY
OK


4.INSPECT THROTTLE BODY (THROTTLE VALVE)

  1. Check if the throttle valve opens and closes smoothly.



NG
REPLACE THROTTLE BODY
OK

REPLACE ECM