Toyota Celica 2005 Repair Manual page 788

DTC P2118
CIRCUIT DESCRIPTION
The Electronic Throttle Control System (ETCS) has a dedicated power supply circuit. The voltage (+BM) is
monitored and when the voltage is low (less than 4 V), the ECM concludes that the ETCS has a fault and
current to the throttle control motor is cut.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage
is low, current to the motor is cut. If repairs are made and the system has returned to normal, turn the ignition
switch OFF. The ECM then allows current to flow to the motor and the motor can be restarted.
HINT:
This Electrical Throttle Control System (ETCS) does not use a throttle cable.
ETCS Fuse
From Battery
Throttle Control Motor
DTC No.
P2118 Open in ETCS power source circuit
MONITOR DESCRIPTION
The ECM monitors the battery supply voltage applied to the electronic throttle motor +BM. When the power
supply voltage drops below 0.4 V for 0.8 seconds, the ECM concludes that the power supply circuit has an
open circuit. The MIL is turned on and a DTC is set.
2005 CELICA (RM1131U)
DIAGNOSTICS
Throttle Actuator Control Motor Current
Range/Performance
DTC Detection Condition
− ENGINE (2ZZ−GE)
+BM
+M
−M
ME01
S Open in ETCS power source circuit
S ETCS fuse
S ECM
787
ECM
Motor Control
Circuit
Trouble Area
DI−589
DIC7S−02
A21430