P2112

DTC P2112 THROTTLE ACTUATOR CONTROL SYSTEM-STUCK CLOSED

CIRCUIT DESCRIPTION

DTC Detection Condition:

The throttle actuator is operated by the ECM and it opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM to control the throttle actuator and set the throttle valve angle in response to driver input.

HINT: This Electronic Throttle Control System (ETCS) does not use a throttle cable.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

The ECM concludes that there is a malfunction of the ETCS when the throttle valve remains at a fixed angle despite high drive current from the ECM. The ECM illuminates the MIL and sets a DTC. This monitor runs after the engine is started, and then the accelerator pedal is fully depressed and fully released quickly.

FAIL-SAFE

If the ETCS has a malfunction, the ECM shuts off current to the throttle actuator. 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 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 ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal.

Wiring Diagram:

Step 1 - 3:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held 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.

CHECK FOR INTERMITTENT PROBLEMS

HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the hand-held tester is in check mode. In check mode, the hand-held tester uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic.

a. Clear the DTCs
b. Set the check mode
c. Perform a simulation test.
d. Check the connector and terminal
e. Wiggle the harness and the connector