DESCRIPTION The electronic throttle control system has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (less than 4 V), the ECM determines that there is a malfunction in the electronic throttle control system and cuts off the current to the throttle actuator. When the voltage becomes unstable, the electronic throttle control system 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 engine switch off. If a malfunction is not detected the ECM allows current to flow to the throttle actuator so that it can operate. HINT: The electronic throttle control system does not use a throttle cable. ![]()
MONITOR DESCRIPTION The ECM monitors the battery supply voltage applied to the throttle actuator. When the power supply voltage (+BM) is less than 4 V for 0.8 seconds or more, the ECM interprets this as an open or ground in the power supply circuit, then illuminates the MIL and stores this DTC. MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
CONFIRMATION DRIVING PATTERN HINT:
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FAIL-SAFE When any of these DTCs or other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 7° throttle valve opening angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to be driven at a low speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly. Fail-safe mode continues until a pass condition is detected, and the engine switch is then turned off. WIRING DIAGRAM Refer to DTC P210014. Click here CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. HINT: Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Engine / Data List / +BM Voltage. Powertrain > Engine > Data List
(e) According to the display on the Techstream, read the Data List. Standard Voltage: 11 to 14 V
(a) Disconnect the ECM connector. (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Avalon Service & Repair Manual > Pre-collision System(for Gasoline Model): Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. (e) Check for DTCs. Click here Body Electrical > Pre-Collision 2 > Trouble Codes ...