Toyota Celica 2005 Repair Manual page 793

DI−594
DTC P2119
CIRCUIT DESCRIPTION
The Electric Throttle Control System (ETCS) is composed of a throttle motor that operates the throttle valve,
a throttle position sensor that detects the opening angle of the throttle valve, an accelerator pedal position
sensor that detects the accelerator pedal position, and the ECM that controls the ETCS system.
The ECM operates the throttle motor to position the throttle valve for proper response to driver inputs. The
throttle position sensor, which is mounted on the throttle body, detects the opening angle of the throttle valve
and provides this signal to the ECM so that the ECM can regulate the throttle motor.
DTC No.
Throttle opening angle continues to vary greatly from target
P2119
throttle opening angle
MONITOR DESCRIPTION
The ECM determines the "actual" throttle angle based on the throttle position sensor signal. The "actual"
throttle position is compared to the "target" throttle position commanded by the ECM. If the difference of
these two values exceeds a specified limit, the ECM interprets this as a fault in the ETCS (Electronic Throttle
Control System). The ECM 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 injection (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.
MONITOR STRATEGY
Related DTCs
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
2005 CELICA (RM1131U)
DIAGNOSTICS
Throttle Actuator Control Throttle Body
Range/Performance
DTC Detecting Condition
Main sensors/components
Related sensors/components
Continuous
1 sec.
Immediate
None
− ENGINE (2ZZ−GE)
S Electric throttle control system
S ECM
P2119
792
Trouble Area
Electronic throttle control system failure
Throttle actuator motor
Throttle position sensor
DIAKC−03