P2103
2AZ-FE ENGINE CONTROL: SFI SYSTEM: P2102,P2103: Throttle Actuator Control Motor Circuit Low
DESCRIPTION
The throttle actuator is operated by the ECM and opens and closes the throttle valve using an electric motor and 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. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.
HINT
This electronic throttle control system does not use a throttle cable.
MONITOR DESCRIPTION
The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on the current value. If the current is outside the standard range, the ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and sets a DTC.
* Example:
* When the electrical current is less than 0.5 A and the throttle actuator duty ratio exceeds 80%, the ECM interprets this as the current being outside the standard range, and illuminates the MIL and sets a DTC.
* If the malfunction is not repaired successfully, the DTC can be set when the engine is quickly revved to a high rpm several times after the engine has idled for 5 seconds after starting the engine.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P2102:
P2102:
P2103:
P2103:
TYPICAL MALFUNCTION THRESHOLDS
P2102:
P2102:
P2103:
P2103:
FAIL-SAFE
When either of these DTCs, as well as other DTCs relating to 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 running at a minimal speed. If the accelerator pedal is depressed gently, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.
4. Turn the ignition switch off.
5. Turn the ignition switch to ON and turn the Techstream on [A].
6. Start the engine.
7. With the vehicle stationary, fully depress the accelerator pedal and quickly release it [B].
8. Check that 16 seconds or more have elapsed from the instant when the accelerator pedal is first depressed.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P2102 or P2103.
11. Check the DTC judgment result [C].
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.
12. If the test result is UNKNOWN, enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
13. Read Pending DTCs.
HINT
If a pending DTC is output, the system is malfunctioning.
14. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
- Read freeze frame data using the 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.
- 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 Techstream. However, the ECM shuts off the throttle actuator current when the electronic throttle control system 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:
(c) Reconnect the throttle body connector.
NG -- REPLACE THROTTLE BODY Components
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):
(d) Reconnect the ECM connector.
(e) Reconnect the throttle body connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE BODY - ECM)
OK -- Continue to next step.
3. INSPECT THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE)
(a) Check for foreign objects between the throttle valve and the housing.
OK:
No foreign objects between throttle valve and housing.
NG -- REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
OK -- Continue to next step.
4. INSPECT THROTTLE BODY (THROTTLE VALVE)
(a) Check if the throttle valve opens and closes smoothly.
OK:
Throttle valve opens and closes smoothly.
NG -- REPLACE THROTTLE BODY Components
OK -- REPLACE ECM Components