P2103

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2102,P2103: Throttle Actuator Control Motor Circuit Low


DESCRIPTION

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 (TP) sensor which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

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





MONITOR DESCRIPTION

The ECM monitors the flow of electrical current through the electronic throttle actuator, and detects malfunctions or open circuits in the throttle actuator based on the value of the electrical current. When the current deviates from the standard values, the ECM concludes that there is a fault in the throttle actuator. Or, if the throttle valve is not functioning properly (for example, stuck ON), the ECM concludes that there is a fault, illuminates the MIL and sets a DTC.

Example:

The ECM determines that the current has deviated from the standard values when one of the following is detected: 1) the current is more than 10 A, or 2) the actuator driving duty ratio exceeds 80% and the current is less than 0.5 A. Then the ECM turns on the MIL and a DTC is set.

This monitor runs after the engine is started, idled for 5 seconds and then quickly revved at a high rpm several times.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





P2102:





P2103:





TYPICAL MALFUNCTION THRESHOLDS

P2102:





P2103:





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the ignition switch to ON and turn the Techstream on.

- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

- Turn the ignition switch off and wait for at least 30 seconds.

- Turn the ignition switch to ON and turn the Techstream on [A].

- Start the engine.

- With the vehicle stationary, fully depress the accelerator pedal and quickly release it [B].

- Check that 16 seconds or more have elapsed from the instant when the accelerator pedal is first depressed.

- Enter the following menus: Powertrain / Engine / Trouble Codes [C].

- Read the DTCs.

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P2102 or P2103.

- Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [C] again.
- If no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
FAIL-SAFE

When any of these DTCs or other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions are 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 7° 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





INSEPCTION PROCEDURE

HINT
- Read freeze frame data using the Techstream. 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.
- The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Open Duty / Throttle Motor Close Duty) can be read using the Techstream. However, the ECM shuts off the throttle actuator current when the ETCS malfunctions.
PROCEDURE

1. INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE ACTUATOR)





(a) Disconnect the throttle body connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPLACE THROTTLE BODY Service and Repair
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (THROTTLE BODY - ECM)





(a) Disconnect the throttle body connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for foreign objects between the throttle valve and housing.

OK:

No foreign objects between the throttle valve and the housing.

NG -- REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
OK -- Continue to next step.

4. INSPECT THROTTLE VALVE (THROTTLE VALVE)

(a) Check if the throttle valve can open and close smoothly.

OK:

Throttle valve can move smoothly.

NG -- REPLACE THROTTLE BODY Service and Repair

OK -- REPLACE ECM Service and Repair