- DTC judgment completed
- System normal
Lexus NX: Throttle Actuator Control Motor Circuit Low (P2102,P2103)
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Throttle Actuator Control Motor Circuit Low (P2102,P2103)
DESCRIPTION
The throttle actuator is operated by the ECM and 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 with motor assembly. 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 a request from the hybrid system.
HINT:
This Electronic Throttle Control System (ETCS) does not use a throttle cable.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P2102 | Throttle Actuator Control Motor Circuit Low | Both of the following conditions are met for 2.0 seconds (1 trip detection logic): (a) The throttle actuator drive duty cycle is 80% or higher. (b) The throttle actuator current is less than 0.5 A. |
| Comes on | DTC stored |
| P2103 | Throttle Actuator Control Motor Circuit High | Either of the following conditions is met (1 trip detection logic):
|
| Comes on | DTC stored |
MONITOR DESCRIPTION
The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this 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 stores a DTC.
MONITOR STRATEGY
| Related DTCs | P2102: Electronic throttle actuator control motor current (low current) P2103: Electronic throttle actuator control motor current (high current) |
| Required Sensors/Components (Main) | Throttle actuator (throttle body with motor assembly) |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Continuous |
| Duration | 2 seconds: P2102 25 times: P2103 (Case 1) 0.6 seconds: P2103 (Case 2) |
| MIL Operation | Immediate |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
All| Monitor runs whenever the following DTCs are not stored | None |
| All of the following conditions are met | - |
| Command to electronic throttle actuator | On |
| Output duty cycle | 80% or higher |
| Electronic throttle actuator power supply voltage | 8 V or higher |
| Motor current change during last 0.016 seconds | Less than 0.2 A |
| Both of the following conditions are met | - |
| Command to electronic throttle actuator | On |
| Either of the following conditions is met | 1 or 2 |
| 1. Electronic throttle actuator power supply voltage | 8 V or higher |
| 2. Electronic throttle actuator power | On |
TYPICAL MALFUNCTION THRESHOLDS
P2102| Motor current | Less than 0.5 A |
| Motor driver IC high current limiter monitor input | Fail |
| Motor driver IC high current inhibit signal | ON |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for at least 30 seconds.
- Turn the power switch on (IG) and turn the Techstream on [A].
-
Put the engine in inspection mode (maintenance mode).
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- 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 and ECT / Trouble Codes [C].
-
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P2102 or P2103.
-
Check the DTC judgment result.
Techstream Display
Description
NORMAL
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.
-
If no pending DTC is output, perform a universal trip and check for permanent DTCs.
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HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
FAIL-SAFE
When either of these DTCs or other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions are stored, 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 5.5° throttle valve opening angle by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system. 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 power switch is then turned off.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
- The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Duty (Open) / Throttle Motor Duty (Close)) can be read using the Techstream. However, the ECM shuts off the throttle actuator current when the electronic throttle control system malfunctions.
- 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 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. | INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR) |
(a) Inspect the throttle body with motor assembly.
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HINT:
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
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| NG | .gif) | REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY |
|
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| 2. | CHECK HARNESS AND CONNECTOR (THROTTLE BODY WITH MOTOR ASSEMBLY - ECM) |
(a) Disconnect the throttle body with motor assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C2-2 (M+) - C48-60 (M+) | Always | Below 1 Ω |
| C2-1 (M-) - C48-30 (M-) | Always | Below 1 Ω |
| C2-2 (M+) or C48-60 (M+) - Body ground | Always | 10 kΩ or higher |
| C2-1 (M-) or C48-30 (M-) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) |
(a) Check for foreign matter between the throttle valve and housing.
OK:
No foreign matter between the throttle valve and housing.
HINT:
Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.
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| NG | | REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY |
|
| 4. | INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE) |
(a) Check if the throttle valve opens and closes smoothly.
OK:
Throttle valve opens and closes smoothly.
HINT:
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
Click here
| OK | | REPLACE ECM |
| NG | | REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY |
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