ECD SYSTEM, Diagnostic DTC:15

DTC Code DTC Name
15 Throttle Motor Circuit Malfunction

DESCRIPTION

Intake restrictor valve control motor is operated by the ECM and it opens and closes the intake restrictor valve.

The fully opening of the intake restrictor valve is detected by the fully open position switch which is mounted on the venturi.

If this DTC is stored, the ECM shuts down the power for the intake restrictor valve control motor.

DTC No. DTC Detection Condition Trouble Area
15 Open or short in intake restrictor valve control motor circuit

  • Open or short in intake restrictor valve control motor circuit

  • Intake restrictor valve control motor

  • Intake restrictor valve

  • Open or short in fully opened switch circuit

  • Fully opened switch

  • ECM
Open or short in fully opened switch circuit

WIRING DIAGRAM

A01BFCME01

INSPECTION PROCEDURE

Tech Tips

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.

PROCEDURE


  1. INSPECT FULLY OPENED SWITCH


    1. A01BH7Z

      Disconnect the fully opened switch connector.

    2. Remove the venturi.

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

      Standard resistance
      Tester Connection Specified Condition
      1 - 2 (Intake restrictor valve is opened) Below 1 Ω
      1 - 2 (Intake restrictor valve is closed) 10 kΩ or higher

      Tech Tips

      The fully opened switch is integrated with the venturi. If the fully opened switch is replaced, the venturi must be replaced in whole.


    NG

    REPLACE VENTURI

    OK

  2. CHECK HARNESS AND CONNECTOR (FULLY OPENED SWITCH - BODY GROUND, ECM - FULLY OPENED SWITCH)


    1. A01BFU7E01

      Disconnect the fully opened switch connector.

    2. Disconnect the ECM D4 connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      (D63-1) - Body ground Below 1 Ω
      THOP (D4-15) - (D63-2) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      THOP (D4-15) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (INTAKE RESTRICTOR VALVE CONTROL MOTOR CIRCUIT)


    1. A01BFFBE01

      During engine racing, measure the waveform according to the value(s) in the table below.

      OK
      Tester Connection Specified Condition
      LU+A (D2-10) - E01 (D2-13) Correct waveform shown
      LU-A (D2-9) - E01 (D2-13) Correct waveform shown
      LU+B (D2-8) - E01 (D2-13) Correct waveform shown
      LU-B (D2-7) - E01 (D2-13) Correct waveform shown

    NG

    INSPECT INTAKE RESTRICTOR VALVE CONTROL MOTOR Click here

    OK

    REPLACE ECM

  4. INSPECT INTAKE RESTRICTOR VALVE CONTROL MOTOR


    1. A01BASB

      Disconnect the intake restrictor valve control motor connector.

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

      Standard resistance
      Tester Connection Specified Condition
      1 - 2 18 to 22 Ω (20°C (68°F))
      2 - 3 18 to 22 Ω (20°C (68°F))
      4 - 5 18 to 22 Ω (20°C (68°F))
      5 - 6 18 to 22 Ω (20°C (68°F))

      Tech Tips

      The intake restrictor valve control motor is integrated with the venturi. If the intake restrictor valve control motor is replaced, the venturi must be replaced in whole.


    NG

    REPLACE VENTURI

    OK

  5. CHECK HARNESS AND CONNECTOR (INTAKE RESTRICTOR VALVE CONTROL MOTOR - ECM)


    1. A01BF1IE01

      Disconnect the intake restrictor valve control motor connector.

    2. Disconnect the ECM D2 connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      LU+A (D50-6) - LU+A (D2-10) Below 1 Ω
      LU-A (D50-4) - LU-A (D2-9) Below 1 Ω
      LU+B (D50-3) - LU+B (D2-8) Below 1 Ω
      LU-B (D50-1) - LU-B (D2-7) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      LU+A (D2-10) - E01 (D2-13) 10 kΩ or higher
      LU-A (D2-9) - E01 (D2-13) 10 kΩ or higher
      LU+B (D2-8) - E01 (D2-13) 10 kΩ or higher
      LU-B (D2-7) - E01 (D2-13) 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK FOR ECM POWER SOURCE CIRCUIT