P2118

1NZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2118: Throttle Actuator Control Motor Current Range / Performance

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 control motor is cut.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is low, the current to the motor is cut. If repairs are made and the system has returned to normal, turn the power switch OFF. The ECM then allows current to flow to the motor and the motor can be restarted.
HINT: This Electrical Throttle Control System (ETCS) does not use a throttle cable.









MONITOR DESCRIPTION

The ECM monitors the battery supply voltage applied to the electronic throttle motor. When the power supply voltage drops below the threshold, the ECM concludes that there is an open in the power supply circuit. A DTC is set and the MIL is turned on.

FAIL-SAFE

If the Electronic Throttle Control System (ETCS) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control 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 to drive.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a "pass" condition is detected and then the power switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Read freeze frame data using 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. INSPECT FUSE (ETCS FUSE)




(a) Remove the ETCS fuse from the engine room relay block.
(b) Check the resistance of the ETCS fuse.
Standard resistance:
Below 1 Ohms
(c) Reinstall the ETCS fuse.
NG -- CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FUSE
OK -- Continue to next step.

2. CHECK ECM (+BM VOLTAGE)




(a) Measure the voltage between the specified terminals of the E5 and E7 ECM connectors.
Standard voltage:






OK -- REPLACE ECM
NG -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY)
(a) Check the harness and the connectors between the ETCS fuse and the ECM connector.





(1) Remove the ETCS fuse from the engine room relay block.





(2) Disconnect the E7 ECM connector.
(3) Measure the resistance according to the value(s) in the table below.
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 the connectors between the ETCS fuse and the battery.
(1) Remove the ETCS fuse from the engine room relay block.
(2) Disconnect the positive battery terminal.
(3) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):






(4) Reinstall the ETCS fuse.
(5) Reconnect the positive battery terminal.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- CHECK AND REPLACE FUSIBLE LINK BLOCK ASSEMBLY