SFI SYSTEM, Diagnostic DTC: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. 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.

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, if the throttle actuator is 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 is 80% or more, the ECM interprets this as the current being outside the standard range, illuminates the MIL and stores a DTC.

If the malfunction is not repaired successfully, a DTC is stored when the engine is quickly revved to a high engine speed several times after the engine is started and has idled for 5 seconds.

MONITOR STRATEGY

CONFIRMATION DRIVING PATTERN

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch to ON and turn the intelligent tester on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).

4. Turn the ignition switch off and wait for at least 30 seconds.

5. Turn the ignition switch to ON and turn the intelligent tester on [A].

6. Start the engine.

7. With the vehicle stationary, fully depress the accelerator pedal and quickly release it [B].

8. Check that 16 seconds or more have elapsed from the instant when the accelerator pedal is first depressed.

9. Enter the following menus: Powertrain / Engine and ECT / DTC [C].

10. Read the pending DTCs.

    Tech Tips

    
    

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

12. Input the DTC: P2102 or P2103.

13. Check the DTC judgment result.

    Intelligent Tester 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

    Tech Tips

    
    

    • 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 6.5° 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 position 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.

The ECM continues operating in fail-safe mode until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Throttle Body Assembly)

      Disconnect the throttle body assembly connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition 1 (M-) - 2 (M+) 20°C (68°F) 0.3 to 100 Ω

   
   

   NG

   REPLACE THROTTLE BODY ASSEMBLY Click here

   OK

2. CHECK HARNESS AND CONNECTOR (THROTTLE ACTUATOR - ECM)

   
   

   1. Disconnect the throttle body assembly connector.

   2. Disconnect the ECM connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition D29-2 (M+) - D97-43 (M+) Always Below 1 Ω D29-1 (M-) - D97-42 (M-) Always Below 1 Ω D29-2 (M+) or D97-43 (M+) - Body ground Always 10 kΩ or higher D29-1 (M-) or D97-42 (M-) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT THROTTLE BODY ASSEMBLY

   
   

   1. Check for foreign objects between the throttle valve and the housing.

      OK
      No foreign objects between throttle valve and housing.

   
   

   NG

   REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY ASSEMBLY

   OK

4. INSPECT THROTTLE VALVE

   
   

   1. Check if the throttle valve opens and closes smoothly.

      OK
      Throttle valve opens and closes smoothly.

   
   

   NG

   REPLACE THROTTLE BODY ASSEMBLY Click here

   OK

   REPLACE ECM Click here