The Electronic Throttle Control System (ETCS) has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (below 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. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.
This electronic throttle control system does not use a throttle cable.
|DTC No.||DTC Detection Condition||Trouble Area|
An open in electronic throttle control system power source (+BM) circuit
(1 trip detection logic)
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 stores the DTC.
If the malfunction is not repaired successfully, the DTC is stored 5 seconds after the engine is next started.
|Required Sensors/Components||Throttle actuator, Throttle valve (throttle with motor body assembly), ETCS fuse|
|Frequency of Operation||Continuous|
TYPICAL ENABLING CONDITIONS
|Electronic throttle actuator power||On|
|Battery voltage||8 V or higher|
TYPICAL MALFUNCTION THRESHOLDS
|Electronic throttle actuator power supply voltage||Less than 4 V|
COMPONENT OPERATING RANGE
|Electronic throttle control||11 to 14 V|
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Click here.
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the GTS on [A].
Start the engine.
Slowly depress the accelerator pedal, raise the engine speed to approximately 3000 rpm for approximately 5 seconds, and then idle the engine [B].
Check that 16 seconds or more have elapsed since engine was started.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
Read Pending DTCs.
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P2118.
Check the DTC judgment result.
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.
When this DTC or other DTCs relating to electronic throttle control system 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 6° throttle 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 continue at a minimal 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.
Refer to DTC P2102 Click here.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
Read freeze frame data using the GTS. 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.
READ VALUE USING GTS (+BM VOLTAGE)
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Throttle / +BM voltage.
Read the value displayed on the GTS.
CHECK FOR INTERMITTENT PROBLEMS Click here
CHECK HARNESS AND CONNECTOR (ECM - BATTERY, BODY GROUND)
Disconnect the ECM connectors.
Measure the voltage according to the value(s) in the table below.
Measure the resistance according to the value(s) in the table below.
Reconnect the ECM connectors.
REPAIR OR REPLACE HARNESS OR CONNECTOR