Brand:
Toyota
Model Name:
4Runner GRN210 215 UZN210 215
Manual:
Repair Manual
Section:
1Gr-Fe Engine Control System
Title:
Sfi System
DTC P2102 Throttle Actuator Control Motor Circuit Low
DTC P2103 Throttle Actuator Control Motor Circuit High
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 (TP) sensor, which is mounted on the throttle body. The TP 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 ETCS (Electronic Throttle Control System) does not use a throttle cable.
| DTC No. | DTC Detection Conditions | Trouble Areas |
| P2102 | Conditions (a) and (b) continue for 2.0 seconds (1 trip detection logic): (a) Throttle actuator duty ratio 80% or more (b) Throttle actuator current is 0.5 A or less |
|
| P2103 | Either of following conditions met:
|
|
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 sets a DTC.Example:
- When the electrical current is more than 10 A, or 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, a DTC is set when the engine is quickly revved to a high rpm several times after the engine has idled for 5 seconds after engine start.
MONITOR STRATEGY
| Related DTCs | P2102: Throttle actuator control motor current (low current) P2103: Throttle actuator control motor current (high current) |
| Required Sensors / Components (Main) | Throttle actuator |
| Required Sensors / Components (Related) | - |
| Frequency of Operation | Continuous |
| Duration | P2102: 2 seconds P2103: 0.6 seconds |
| MIL Operation | Immediate |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever these DTCs are not present | None |
| Throttle motor | ON |
| Duty-cycle ratio to open throttle actuator | 80 % or more |
| Throttle actuator power supply | 8 V or more |
| Current motor current - Motor current at 0.016 sec. before | Less than 0.2 A |
| Throttle motor | ON |
| Either of the following conditions is met: | Condition 1 or 2 |
| 1. Throttle actuator power supply | 8 V or more |
| 2. Throttle actuator power | ON |
| Battery voltage | 8 V or more |
| Starter | OFF |
TYPICAL MALFUNCTION THRESHOLDS
| Throttle actuator current | Less than 0.5 A (when motor drive duty 80 % or more) |
| Either of the following conditions is met | Condition 1 or 2 |
| 1. Hybrid IC diagnosis signal | Fail |
| 2. Hybrid IC current limiter port | Fail for |
FAIL-SAFE
When either of these DTCs, as well as 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 off, and the throttle valve is returned to a 6° 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
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the intelligent tester. 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 MOT) and the throttle actuator duty ratio (THROTTLE OPN / THROTTLE CLS) can be read using the intelligent tester. However the ECM shuts off the throttle actuator current when the ETCS malfunctions.
1.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (RESISTANCE OF THROTTLE CONTROL MOTOR)
Disconnect the T2 throttle with motor body connector.
Measure the resistance between the terminals of the throttle control motor.
- Standard resistance:
Tester Connections Specified Conditions M+ (T2-2) - M- (T2-1) 0.3 to 100 Ω at 20°C (68°F)
Reconnect the throttle with motor body connector.
| REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY | |||
| OK | |
 |
2.CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)
Disconnect the T2 throttle with motor body connector.
Disconnect the E4 ECM connector.
Measure the resistance.
- Standard resistance (Check for open):
Tester Connections Specified Conditions M+ (T2-2) - M+ (E4-5) Below 1 Ω M- (T2-1) - M- (E4-4) Below 1 Ω
- Standard resistance (Check for short):
Tester Connections Specified Conditions M+ (T2-2) or M+ (E4-5) - Body ground 10 kΩ or higher M- (T2-1) or M- (E4-4) - Body ground 10 kΩ or higher
Reconnect the throttle with motor body connector.
Reconnect the ECM connector.
| REPAIR OR REPLACE HARNESS OR CONNECTOR | |||
| OK | |
|
3.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY
Check for foreign objects between the throttle valve and the housing.
- OK:
- Normal
| REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY | |||
| OK | |
|
4.INSPECT THROTTLE VALVE
Check if the throttle valve opens and closes smoothly.
- OK:
- The throttle valve opens and closes smoothly.
| REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY | |||
| OK | |
 | |
| REPLACE ECM | |