Toyota Celica 2005 Repair Manual page 789

DI−590
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.
MONITOR STRATEGY
Related DTCs
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
TYPICAL ENABLING CONDITIONS
Item
The monitor will run whenever this DTC is
not present
Actuator power
Battery voltage
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Throttle actuator motor power supply voltage
COMPONENT OPERATING RANGE
Parameter
Throttle actuator motor power supply voltage
2005 CELICA (RM1131U)
DIAGNOSTICS −
P2118
Throttle actuator motor
Continuous
0.8 sec.
Immediate
None
Minimum
8 V
788
ENGINE (2ZZ−GE)
Throttle actuator motor power supply line range
check (Low voltage)
Specification
See page DI−295
ON
Threshold
Less than 4 V
Standard Value
9 to 14 V
Maximum
−