P2102

1NZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2102: Throttle Actuator Control Motor Circuit Low

DTC P2102 - Throttle Actuator Control Motor Circuit Low

DTC P2103 - Throttle Actuator Control Motor Circuit High

DESCRIPTION

The throttle motor 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 throttle position sensor provides feedback to the ECM. This feedback allows the ECM to control the throttle motor and monitor the throttle opening angle as the ECM responds to driver inputs.
HINT: This Electrical Throttle Control System (ETCS) does not use a throttle cable.





MONITOR DESCRIPTION

The ECM monitors the flow of electrical current through the electronic throttle motor, and detects malfunction or open circuits in the throttle motor based on the value of the electrical current. When the current deviates from the standard values, the ECM concludes that there is a fault in the throttle motor. Or, if the throttle valve is not functioning properly (for example, stuck ON), the ECM concludes that there is a fault in the throttle motor and turns on the MIL and a DTC is set.
Example:
When the current is more than 10 A, or, the current is less than 0.5 A when the motor driving duty ratio is more than 80%, the ECM concludes that the current is deviated from the standard values, turns on the MIL and a DTC is set.

FAIL-SAFE

If the Electronic Throttle Control System (ETCS) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by the force of 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 enable the vehicle to continue to drive.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a "pass" condition is detected and then the power switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

MONITOR STRATEGY

P2102: Throttle actuator control motor current (low current)





P2103: Throttle actuator control motor current (high current)





TYPICAL ENABLING CONDITIONS

P2102: Throttle actuator control motor current (low current)





P2103: Throttle actuator control motor current (high current)





TYPICAL MALFUNCTION THRESHOLDS

P2102: Throttle actuator control motor current (low current)





P2103: Throttle actuator control motor current (high current)





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Read freeze frame data using 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 Freeze Frame Data.

PROCEDURE

1. INSPECT THROTTLE W/ MOTOR BODY ASSEMBLY (THROTTLE CONTROL MOTOR)




(a) Disconnect the throttle control motor connector.
(b) Measure the motor resistance between terminals 1 (M-) and 2 (M+).
Standard resistance:





(c) Reconnect the throttle control motor connector.
NG -- REPLACE THROTTLE W/ MOTOR BODY ASSEMBLY
OK -- Continue to next step.

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




(a) Disconnect the E5 ECM connector.




(b) Disconnect the T2 throttle control motor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the ECM connector.
(e) Reconnect the throttle control motor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT THROTTLE W/ MOTOR BODY ASSEMBLY
(a) Visually check between the throttle valve and the housing for foreign objects.
Also, check if the valve can open and close smoothly.
OK:
The throttle valve is not contaminated by foreign objects and can move smoothly.
NG -- REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
OK -- REPLACE ECM