Toyota Celica 2005 Repair Manual page 781

DI−582
DTC P2102
DTC P2103
CIRCUIT 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.
DTC No.
Conditions (a) and (b) continue for 2.0 seconds:
P2102 (a) Throttle control motor output duty 80 % or more
(b) Throttle control motor current 0.5 A or less
Either of following conditions is met:
P2103 S Throttle control motor current 10 A or more (0.1 seconds)
S Throttle control motor current 7 A or more (0.6 seconds)
MONITOR DESCRIPTION
The ECM monitors the current through the electronic throttle motor and detects malfunctions or open circuit
in the throttle motor based on the voltage of the current. When the current deviates from the standard, 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 and turns on the MIL and a DTC is set.
Example:
The current is more than 10 A. Or the current is less than 0.5 A when the motor driving duty ratio is exceeding
80%. The ECM concludes that the current is out of the specified range, turns on the MIL and a DTC is set.
FAIL SAFE
If the ETCS (Electronic Throttle Control System) 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 infection (Inter-
mittent fuel−cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the
vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a "pass" condition is detected and then the ignition switch is turned OFF, the fail−safe operation will stop
and the system will return to normal condition.
2005 CELICA (RM1131U)
DIAGNOSTICS
Throttle Actuator Control Motor Circuit Low
Throttle Actuator Control Motor Circuit High
DTC Detection Condition
− ENGINE (2ZZ−GE)
S Open in throttle control motor circuit
S Throttle control motor
S ECM
S Short in throttle control motor circuit
S Throttle control motor
S Throttle valve
S Throttle body assy
S ECM
780
Trouble Area
DIC7Q−02