Toyota Tundra 2005 Service - Repair - Maintenance page 1070

DI−786
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 4V), 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, the 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 (+BM)
MONITOR DESCRIPTION
The ECM monitors the battery supply voltage applied to the electronic throttle motor +BM. When the power
supply voltage drops below the threshold, the ECM concludes that the power supply has an open circuit.
The MIL is turned on and a DTC is set.
DIAGNOSTICS
Throttle Actuator Control Motor Current
Range/Performance
2
1
DTC Detection Condition
− ENGINE (2UZ−FE)
+BM
+M
−M
ME01
S Open in ETCS power source circuit
S ETCS fuse
S ECM
ECM
Motor Control
Circuit
Trouble Area
DIDS2−01
A21430