P2103

4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2102: Throttle Actuator Control Motor Circuit Low

DTC P2102 - Throttle Actuator Control Motor Circuit Low

DTC P2103 - Throttle Actuator Control Motor Circuit High

SYSTEM 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.





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





TYPICAL ENABLING CONDITIONS

All:





P2102:





P2103:





TYPICAL MALFUNCTION THRESHOLDS

P2102:





P2103:





FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to ETCS (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 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 running 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 engine switch is then turned off.

WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- Read freeze frame data using 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 Freeze Frame Data.
- The throttle actuator current (THROTTLE MOT) and the throttle actuator duty ratio (THROTTLE OPN DUTY / THROTTLE CLS DUTY) can be read using Techstream. However, the ECM shuts off the throttle actuator current when the ETCS malfunctions.

PROCEDURE

1. INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE CONTROL MOTOR)





(a) Disconnect the E17 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
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)





(a) Disconnect the E17 throttle body connector.
(b) Disconnect the E3 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 throttle body connector.
(e) Reconnect the ECM connector.
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 the housing.
NG -- CLEAN THROTTLE BODY
OK -- Continue to next step.
4. INSPECT THROTTLE BODY (THROTTLE VALVE)
(a) Check if the throttle valve opens and closes smoothly.
NG -- REPLACE THROTTLE BODY
OK -- REPLACE ECM