Lexus ES: Throttle Actuator "A" Control Motor Circuit Current Below Threshold (P210018,P210019)
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.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P210018 | Throttle Actuator "A" Control Motor Circuit Current Below Threshold | Both of the following conditions are met for 2 seconds or more (1 trip detection logic):
|
| Comes on | DTC stored | SAE Code: P2102 |
| P210019 | Throttle Actuator "A" Control Motor Circuit Current Above Threshold | Either of the following conditions is met (1 trip detection logic):
|
| Comes on | DTC stored | SAE Code: P2103 |
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 operate properly (for example, it is stuck open), the ECM will determines there is a malfunction, illuminate the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | P2102: Electronic throttle actuator control motor range check (low current) P2103: Electronic throttle actuator control motor range check (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 0.1 seconds: 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. Command to electronic throttle actuator power | On |
TYPICAL MALFUNCTION THRESHOLDS
P2102| Throttle actuator 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
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
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When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- 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) [A].
- Turn the Techstream on.
-
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].
HINT:
During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
- Check that 16 seconds or more have elapsed since the accelerator pedal was first depressed.
- Enter the following menus: Powertrain / Engine / 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 / Utility / All Readiness.
- Input the DTC: P210018 or P210019.
-
Check the DTC judgment result.
Techstream Display
Description
NORMAL
- DTC judgment completed
- System normal
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [C] again.
-
[A] to [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
FAIL-SAFE
When this DTC is 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 7.5° throttle valve opening 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 engine torque request signal sent from the hybrid vehicle control ECU assembly, to allow the vehicle to continue being driven 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 power switch is then turned off.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
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(Select Powertrain in Health Check and then check the time stamp data.)
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If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
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HINT:
- The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Duty Ratio (Open) / Throttle Motor Duty Ratio (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 |
|---|---|---|
| C57-6 (M+) - C88-2 (M+) | Always | Below 1 Ω |
| C57-5 (M-) - C88-1 (M-) | Always | Below 1 Ω |
| C57-6 (M+) or C88-2 (M+) - Body ground and other terminals | Always | 10 kΩ or higher |
| C57-5 (M-) or C88-1 (M-) - Body ground and other terminals | 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 the 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 MATTER 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.
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| OK | | REPLACE ECM |
| NG | | REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY |
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