Dtc P2102 Throttle Actuator Control Motor Circuit Low


DESCRIPTION

MONITOR DESCRIPTION

FAIL-SAFE

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE ACTUATOR)

CHECK WIRE HARNESS (THROTTLE ACTUATOR - ECM)

INSPECT THROTTLE BODY

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 it opens and closes the throttle valve.
The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body. The sensor provides feedback to the ECM for controlling the throttle actuator, which adjusts the throttle valve opening in response to driving conditions.
If this DTC is detected, the ECM shuts down the power for the throttle actuator, and the throttle valve is locked at a predetermined opening angle by the return spring. Also, all electronically controlled throttle operations are canceled until the system returns to normal and the ignition switch is turned OFF.

HINT:
This Electronic Throttle Control System (ETCS) 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 output duty ratio is 80% or more
(b) Throttle actuator current is 0.5 A or less
  1. Open in throttle actuator circuit
  1. Throttle actuator
  1. ECM
P2103
Throttle actuator current is 7 A or more for 0.6 seconds (1 trip detection logic)
  1. Short in throttle actuator circuit
  1. Throttle actuator
  1. Throttle valve
  1. Throttle body
  1. ECM

MONITOR DESCRIPTION

The ECM monitors the flow of electrical current through the electronic throttle actuator, and detects malfunctions or open circuits in the throttle actuator based on the electrical current. When the current deviates from the standard values, the ECM concludes that there is a fault in the throttle actuator. Or, if the throttle valve is not functioning properly (for example, stuck ON), the ECM concludes that there is a fault, illuminates the Malfunction Indicator Lamp (MIL) and sets a DTC.

FAIL-SAFE

If the ETCS is malfunctioning, the ECM cuts off the current to the throttle actuator. The throttle control valve returns to a predetermined throttle position (approximately 6°) by the force of the return spring.
Then, required engine power is calculated using the ignition timing and accelerator pedal position. The engine is controlled by intermittent fuel-cut.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven at minimum speed. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically.

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P2102 Throttle Actuator Control Motor Circuit Low


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
1.INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE ACTUATOR)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P2102 Throttle Actuator Control Motor Circuit Low

  1. Disconnect the T26 throttle body connector.

  1. Measure the motor resistance of throttle actuator.

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


NG
REPLACE THROTTLE BODY
OK


2.CHECK WIRE HARNESS (THROTTLE ACTUATOR - ECM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P2102 Throttle Actuator Control Motor Circuit Low

  1. Disconnect the T26 throttle body connector.

  1. Disconnect the E15 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    T26-2 (M+) - E15-5 (M+)
    		Below 1 Ω
    T26-1 (M-) - E15-4 (M-)
    		Below 1 Ω
    T26-2 (M+) or E15-5 (M+) - Body ground
    		10 kΩ or higher
    T26-1 (M-) or E15-4 (M-) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.INSPECT THROTTLE BODY

  1. Visually check for foreign objects between the throttle valve and housing. Also, check that the valve can open and close and smoothly.

    OK:
    Throttle valve is not contaminated with foreign objects and moves smoothly.


NG
REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
OK

REPLACE ECM