EMISSION CONTROL SYSTEM, Diagnostic DTC:41

DTC Code DTC Name
41 Throttle Position Sensor Circuit

DESCRIPTION

The throttle position sensor is mounted on the injection pump with the bracket and detects the adjusting lever angle. When the adjusting lever is at the idle speed side, a voltage of approximately 3.2 - 4.9 V is applied to the terminal VA of the ECU. When the adjusting lever is opened, the voltage applied to the terminal VA of the ECU increases in proportion to the angle of the adjusting lever and becomes approximately 0.2 - 1.6 V when the adjusting lever is at the maximum speed side. The ECU judges the vehicle driving conditions from these signals input from the terminals VA, and uses them as one of the conditions for deciding the air-fuel ratio correction, power increase correction and fuel-cut control etc.

A01KHBEE01
DTC No. DTC Detecting Condition Trouble Area
41 Open or short in throttle position sensor circuit for 0.5 sec. or more

  • Open or short in throttle position sensor circuit


  • Throttle position sensor


  • Emission ECU

Tech Tips

When the connector for the throttle position sensor is disconnected, DTC 41 is not displayed. DTC 41 is displayed only when there is an open or short in the VA signal circuit of the throttle position sensor.

WIRING DIAGRAM

A01KIEQE01

INSPECTION PROCEDURE

Tech Tips

If DTC "22" (water temperature sensor circuit), "31" (vacuum sensor circuit) and "41" (throttle position sensor circuit) are output simultaneously, E2 (sensor ground) may be open.

PROCEDURE


  1. CHECK EMISSION CONTROL ECU


    1. Turn the ignition switch ON

    2. Apply vacuum to the throttle opener.

    3. A01KHLFE04

      Measure the voltage between terminals VA and E2 of the emission ECU when the adjusting lever is turning to the maximum speed side gradually from idle speed side.

      VOLTAGE
      Adjusting Lever Voltage
      Idle speed side 3.2-4.9V
      Maximum speed side 0.2-1.6V

      Tech Tips

      The voltage should increase steadily in proportion to the adjusting valve opening angle.


    OK

    CHECK FOR PROBLEM SYMPTOMS TABLE Click here

    NG

  2. CHECK THROTTLE POSITION SENSOR


    1. Disconnect the throttle position sensor connector.

    2. A01KFAQE02
      Text in Illustration
      *1 Adjusting Lever

      Measure the resistance between terminals 1 and 2, and 2 and 3 of the throttle position sensor connector when the adjusting lever is turning to the maximum speed side, gradually from the idle speed side.

      RESISTANCE
      Terminal Throttle valve Resistance
      2 - 3 - 2.1 - 3.16 kΩ
      1 - 3 Idle speed side 1.3 - 3.16 kΩ
      1 - 3 Maximum speed side 0 - 1.01 kΩ

      Tech Tips

      The resistance between terminals 2 and 3 should increase gradually in accordance with the adjusting valve angle.


    NG

    REPLACE THROTTLE POSITION SENSOR

    OK

  3. CHECK WIRE HARNESS OR CONNECTOR (EMISSION ECU-THROTTLE POSITION SENSOR)


    1. Disconnect the throttle position sensor connector.

    2. Disconnect the emission ECU connector.

    3. A01KH0WE03

      Check the continuity between terminals 2 of the throttle position sensor harness connector and VC of the ECU connector Click here.

      RESISTANCE
      1 Ωor less

    4. Check for short between terminals 2 of the throttle position sensor harness connector and VC of the ECU connector Click here.

      RESISTANCE
      1 MΩ or more
    5. A01KEL4

      Check the continuity between terminals 1 of the throttle position sensor harness connector and VA of the ECU connector Click here.

      RESISTANCE
      1 Ω or less

    6. Check for short between terminals 1 of the throttle position sensor harness connector and VA of the ECU connector Click here.

      RESISTANCE
      1 MΩ or more

    7. Check the continuity between terminals 3 of the throttle position sensor harness connector and E2 of the ECU connector Click here.

      RESISTANCE
      1 Ω or less

    8. Check for short between terminals 3 of the throttle position sensor harness connector and E2 of the ECU connector Click here.

      RESISTANCE
      1 MΩ or more

    NG

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR

    OK

    CHECK AND REPLACE EMISSION CONTROL ECU Click here