Toyota 2GR-FE Manual page 491

DTC P2118
DESCRIPTION
The ETCS (Electronic Throttle Control System) has a dedicated power supply circuit. When the monitored
voltage (+BM) is low (less than 4 V), the ECM determines that there is a malfunction in the ETCS and cuts
off the current to the throttle actuator.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the
voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to
normal, turn the ignition switch off. The ECM then allows the current to flow to the throttle actuator so that
it can be restarted.
HINT:
The ETCS does not use a throttle cable.
ETCS
From
Battery
Throttle Actuator
DTC No.
Open in ETCS power source (+BM) circuit
P2118
(1 trip detection logic)
MONITOR DESCRIPTION
The ECM monitors the battery supply voltage applied to the throttle actuator.
When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this
as an open in the power supply circuit (+BM). The ECM illuminates the MIL and sets the DTC.
If the malfunction is not repaired successfully, the DTC is set 5 seconds after the engine is next started.
MONITOR STRATEGY
Related DTCs
Required Sensors/Components (Main)
Required Sensors/Components (Sub)
Frequency of Operation
Duration
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Throttle Actuator Control Motor Current Range
/ Performance
DTC Detection Condition
+BM
+M
-M
ME01
• Open in ETCS power source circuit
• ETCS fuse
• ECM
P2118: Throttle actuator power supply
Throttle actuator, throttle valve, ETCS fuse
None
Continuous
0.8 seconds
ES–335
ECM
Throttle
Actuator
Control
Circuit
A085832E02
Trouble Area
ES