P2118

2TR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2118: Throttle Actuator Control Motor Current Range / Performance
P2118 - Throttle Actuator Control Motor Current Range / Performance

DESCRIPTION

The ETCS (Electronic Throttle Control System) 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 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.









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





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





FAIL-SAFE

When this DTC, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, is set, 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 6.5° 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 ignition switch is then turned to OFF.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses of circuits related to this system before performing the following inspection procedure.

HINT
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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

1. READ VALUE USING TECHSTREAM (+BM VOLTAGE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / +BM Voltage.

(e) Read the value.

NG -- CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, FUSE - BATTERY)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems

2. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, FUSE - BATTERY)





(a) Check the harness and connector between the ETCS fuse and ECM.

(1) Remove the ETCS fuse from the engine room R/B.

(2) Disconnect the E8 ECM connector.

(3) Check the resistance.

Standard Resistance (Check for open):





Standard Resistance (Check for short)::





(4) Reinstall the ETCS fuse.

(5) Reconnect the ECM connector.

(b) Check the harness and connector between the ETCS fuse and positive battery cable.

(1) Remove the ETCS fuse from the engine room R/B.

(2) Disconnect the positive battery cable.

(3) Check the resistance.

Standard Resistance (Check for open):





Standard Resistance (Check for short):





(4) Reinstall the ETCS fuse.

(5) Reconnect the positive battery cable.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems