ECD SYSTEM, Diagnostic DTC:15

DTC Code DTC Name
15 Throttle Control Motor Circuit Malfunction

DESCRIPTION

Throttle control motor is operated by the ECM and it opens and closes the throttle valve.

The fully opening of the throttle valve is detected by the throttle fully open position switch which is mounted on the throttle body.

If this DTC is stored, the ECM shuts down the power for the throttle control motor.

DTC No. DTC Detecting Condition Trouble Area
15 Open or short in throttle control motor circuit

  • Open or short in throttle control motor circuit

  • Throttle control motor

  • Throttle valve

  • Throttle drive gear

  • Diesel throttle body

  • ECM
Open or short in throttle full switch circuit

WIRING DIAGRAM

A01KHDAE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using intelligent tester. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

PROCEDURE


  1. CHECK DIESEL THROTTLE BODY ASSEMBLY (THROTTLE CONTROL MOTOR CIRCUIT)


    1. A01KIECE01
      Text in Illustration
      *a 10 V/ Division
      *b Signal Waveform
      *c 0.5 msec./Division

      Connect the oscilloscope between terminals LU+A/LU- A/LU+B/LU-B and E7 of the ECM.

    2. Start the engine.

    3. Check the waveform between terminals LU+A/LU-A/ LU+B/LU-B and E7 of the ECM when the engine is racing.

      OK
      The correct waveforms are as shown.

    OK

    CHECK AND REPLACE ECM Click here

    NG

  2. CHECK DIESEL THROTTLE BODY ASSEMBLY (THROTTLE CONTROL MOTOR)


    1. A01KG3FE01
      Text in Illustration
      *1 Ohmmeter

      Disconnect the throttle control motor connector.

    2. Using ohmmeter, measure the resistance between terminals 2 and 1/3, and 5 and 4/6.

      Resistance
      Cold 15 - 28Ω
      Hot 20 - 33Ω

      Tech Tips

      "Cold" and "Hot" above express the temperature of the part itself. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F).


    NG

    REPLACE DIESEL THROTTLE BODY ASSEMBLY

    OK

  3. CHECK WIRE HARNESS (ECM - THROTTLE CONTROL MOTOR)


    1. A01KGK7E01

      Disconnect the throttle control motor connector.

    2. Disconnect the ECM (E7) connector.

    3. Check the continuity between terminals of throttle control motor and ECM connectors as shown in the illustration and table.

      Continuity (Check for open)

      Terminal

      (Throttle control motor ←→ ECM)

      		 Standard
      6 ←→ LU+A (E7-20) Continuity
      4 ←→ LU-A(E7-30)
      3 ←→ LU+B(E7-19)
      1 ←→ LU-B(E7-29)
      Continuity (Check for short)

      Terminal

      (ECM ←→ ECM(Ground))

      		 Standard
      LU+A (E7-20) ←→ E1 (E7-22) No continuity
      LU-A(E7-30) ←→ E1 (E7-22)
      LU+B(E7-19) ←→ E1 (E7-22)
      LU-B(E7-29) ←→ E1 (E7-22)

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

    CHECK AND REPLACE ECM Click here