3Uz-Fe Engine Control System. Dtc P2118 Throttle Actuator Control Motor Current Range / Performance

Engine. Lexus Gs430, Gs300. Uzs190 Grs190

3Uz-Fe Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

READ DATA LIST (+BM VOLTAGE)

CHECK WIRE HARNESS (ECM - ETCS FUSE, ETCS FUSE - BATTERY)

DTC P2118 Throttle Actuator Control Motor Current Range / Performance

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 actuator is cut.
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 has returned to normal, turn the engine switch off. The ECM then allows current to flow to the throttle actuator so that the engine can be restarted.

HINT:

The ETCS does not use a throttle cable.

Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System.
Dtc
P2118 Throttle Actuator Control Motor Current Range / Performance

DTC No.

DTC Detection Conditions

Trouble Areas

P2118

Open in ETCS power source (+BM) circuit
(1 trip detection logic)

Open in ETCS power source circuit

ETCS fuse

MONITOR DESCRIPTION

The ECM monitors the battery supply voltage applied to 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 a DTC.
This monitor runs for 5 seconds (the first 5 seconds of engine idle) after the engine is started.

FAIL-SAFE

If the ETCS has a malfunction, the ECM cuts off current to the throttle actuator. The throttle valve returns to a predetermined opening angle (approximately 16°) by the force of 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 enable the vehicle to continue at a minimal speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a "pass" condition is detected and then the engine switch is turned off, the fail-safe operation will stop and the system will return to normal.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

1.INSPECT FUSE (ETCS)

Remove the ETCS fuse from the engine room No. 2 relay block.

Measure the resistance of the fuse.
Standard resistance:
Below 1 Ω

REPLACE FUSE

OK

2.READ DATA LIST (+BM VOLTAGE)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Enter the following menus: Powertrain / Engine / Data List / Primary / +BM Voltage.
Standard voltage:
9 to 14 V

CHECK FOR INTERMITTENT PROBLEM

NG

3.CHECK WIRE HARNESS (ECM - ETCS FUSE, ETCS FUSE - BATTERY)

Remove the ETCS fuse from the engine room No. 2 relay block, junction block.

Disconnect the E8 ECM connector.

Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection	Specified Condition
Relay block ETCS fuse terminal 1 - Battery positive (+) terminal	Below 1 Ω
Relay block ETCS fuse terminal 2 - E8-5 (+BM)	Below 1 Ω
Relay block ETCS fuse terminal 1 or Battery positive (+) terminal - Body ground	10 kΩ or higher
Relay block ETCS fuse terminal 2 or E8-5 (+BM) - Body ground	10 kΩ or higher

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE ECM