Brand:
Toyota
Model Name:
Yaris NCP90 91 92 93
Manual:
Repair Manual
Section:
1Nz-Fe Engine Control System
Title:
Sfi System
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 assembly. 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 Conditions | Trouble Areas |
| 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 0.2 A or less |
|
| P2103 | Either of following conditions met (1 trip detection logic):
|
|
FAIL-SAFE
When either of these DTCs, or other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, are 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 ignition switch is then turned off.WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- 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.
- 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)
 |
Disconnect the C17 throttle body connector.
Measure the resistance between the terminals of the throttle actuator.
- Standard resistance:
Tester Connections Specified Conditions M+ (2) - M- (1) 0.3 to 100 Ω at 20°C (68°F)
Reconnect the throttle body connector.
| REPLACE THROTTLE BODY ASSEMBLY (Click here) | |||
| OK | |
 |
2.CHECK HARNESS AND CONNECTOR (THROTTLE ACTUATOR - ECM)
 |
Disconnect the C17 throttle body connector.
Disconnect the C20 ECM connector.
Check the resistance.
- Standard resistance (Check for open):
Tester Connections Specified Conditions M+ (C20-42) - M+ (C17-2) Below 1 Ω M- (C20-41) - M- (C17-1)
- Standard resistance (Check for short):
Tester Connections Specified Conditions M+ (C20-42) or M+ (C17-2) - Body ground 10 kΩ or higher M- (C20-41) or M- (C17-1) - Body ground
Reconnect the throttle body connector.
Reconnect the ECM connector.
| 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 object between throttle valve and housing.
| REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY ASSEMBLY | |||
| OK | |
|
4.INSPECT THROTTLE VALVE
Check if the throttle valve opens and closes smoothly.
- OK:
- Throttle valve opens and closes smoothly.
| REPLACE THROTTLE BODY ASSEMBLY (Click here) | |||
| OK | |
 | |
| REPLACE ECM (Click here) | |