SFI SYSTEM(except K111, K111F), Diagnostic DTC:P2102 and P2103
| DTC Code | DTC Name |
|---|---|
| P2102 | Throttle Actuator Control Motor Circuit Low |
| 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 sensor, which is mounted on the throttle body 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 driver inputs.
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 continue for 2.0 seconds (1 trip detection logic): (a) The throttle actuator drive duty cycle is 80% or more. (b) The throttle actuator current is below 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.
Example:
-
When the electrical current is below 0.5 A and the throttle actuator duty ratio exceeds 80%, the ECM interprets this as the current being outside the standard range, illuminates the MIL and stores a DTC.
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on [A].
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.
Tip: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.
GTS 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
N/A
Unable to perform DTC judgment
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
Tip: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] through [C] again and, if necessary, drive the vehicle for a period of time.
FAIL-SAFE
When either of these DTCs or other DTCs relating to ETCS (Electronic Throttle Control System) 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 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 ignition switch is then turned off.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Inspect the fuses for circuits related to this system before performing the following procedure.
Read freeze frame data using the GTS. 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.
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 GTS. However, the ECM shuts off the throttle actuator current when the electronic throttle control system malfunctions.
PROCEDURE
INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)
Inspect the throttle body assembly.
Result
Proceed to
OK
NG
CHECK HARNESS AND CONNECTOR (THROTTLE BODY ASSEMBLY - ECM)
Disconnect the throttle body assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
B3-2 (M+) - B93-60 (M+)
Always
Below 1 Ω
B3-1 (M-) - B93-30 (M-)
Always
Below 1 Ω
B3-2 (M+) or B93-60 (M+) - Body ground
Always
10 kΩ or higher
B3-1 (M-) or B93-30 (M-) - Body ground
Always
10 kΩ or higher
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)
Check for foreign objects between the throttle valve and the housing.
OK
No foreign objects between the throttle valve and housing.
Result
Proceed to
OK
NG
NG REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY ASSEMBLY
INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE)
Check if the throttle valve opens and closes smoothly.
OK
Throttle valve opens and closes smoothly.
Result
Proceed to
OK
NG