ECD SYSTEM, Diagnostic DTC:19 (1)

DTC Code DTC Name
19 (1) Accelerator Position Sensor Circuit Malfunction

DESCRIPTION

The accelerator pedal position sensor is mounted at the accelerator pedal and detects the accelerator pedal opening angle. When the accelerator pedal is fully closed, a voltage of approximately 0.8 V is applied to terminals VA, VAS of the ECM. The voltage applied to terminals VA, VAS of the ECM increases in proportion to the opening angle of the accelerator pedal and becomes approximately 3.8 V when the accelerator pedal is fully opened. The ECM judges the vehicle driving conditions from these signals input from terminals VA, VAS and uses them as one of the conditions to control the injection volume and diesel throttle valve position. This system has 2 way accelerator pedal position sensor and accelerator pedal closed position switch for fail safe.

DTC No. DTC Detecting Condition Trouble Area
19(1)

Condition (a) or (b) continues 0.5 sec. or more:

(a) VA < 0.2 V and {(VAS-fully closed study voltage)} is 0.97 V or more.

(b) VAS < 0.5 V and {(VA-fully closed study voltage)} is 0.97 V or more.

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor

  • ECM

Conditions (a) and (b) continue 2.0 sec. or more:

(c) VA > 4.8 V

(d) 0.2 < VA < 3.45 V, VAS > 4.8 V

Tech Tips

After confirming DTC 19 (1), use the intelligent tester to confirm the accelerator pedal opening percentage and accelerator pedal close position switch condition.

Accelerator pedal opening position expressed as percentage Trouble area
Accelerator pedal fully closed Accelerator pedal fully open
0 % 0 %

  • VCC circuit open

  • VA, VAS circuit open or short
Approx. 100 % Approx. 100 %

  • E2C circuit open

WIRING DIAGRAM

A01KIBSE01

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.

  • When not using the intelligent tester go to step 7.

PROCEDURE


  1. READ VALUE OF INTELLIGENT TESTER (ACCELERATOR PEDAL OPENING PERCENTAGE)


    1. A01KHAP

      Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and push the intelligent tester main switch ON.

    3. Read the accelerator pedal opening percentage.

      Accelerator pedal Accelerator pedal opening position expressed as percentage
      Fully open 0 - 20 %
      Fully closed 80 - 100 %

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK ACCELERATOR LINK ASSEMBLY (CHECK VOLTAGE)


    1. A01KH3HE01

      Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch ON.

    3. Check the voltage between terminals of the accelerator pedal position sensor connector as shown in the table and illustration.

      Voltage

      Terminal

      (Positive terminal ←→ Negative terminal)

      		 Voltage
      VCP1 (4) ←→ Body ground 4.5 - 5.5 V
      VCP2 (6) ←→ Body ground

    NG

    CHECK ECM (CHECK VOLTAGE) Click here

    OK

  3. CHECK ECM (CHECK VOLTAGE)


    1. A01KGF1E01

      Turn the ignition switch ON.

    2. Check the voltage between terminals of the ECM connector as shown in the table and illustration.

      Voltage
      Accelerator pedal

      Terminal

      (Positive terminal ←→ Negative terminal)

      		 Voltage
      Fully closed VPA1 (E9-19) ←→ EP1 (E9-27) 0.5 - 1.1 V
      VPA2 (E9-28) ←→ EP2 (E9-24) 0.9 - 2.3 V
      Fully open VPA1 (E9-19) ←→ EP1 (E9-27) 3.0 - 4.6 V
      VPA2 (E9-28) ←→ EP2 (E9-24) 3.4 - 5.0 V

    OK

    CHECK AND REPLACE ECM Click here

    NG

  4. CHECK WIRE HARNESS (ECM - ACCELERATOR PEDAL POSITION SENSOR)


    1. A01KEY6E01

      Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the ECM (E9) connector.

    3. Check the continuity between terminals of the accelerator pedal position sensor and ECM connectors as shown in the illustration and table.

      Continuity (Check for open)

      Terminal

      (Accelerator pedal position sensor ←→ ECM)

      		 Standard
      VPA1 (5) ←→ VPA1 (E9-19) Continuity
      VPA2 (2) ←→ VPA2 (E9-28)
      Continuity (Check for short)

      Terminal

      (ECM ←→ ECM(Ground))

      		 Standard
      VPA1 (E9-19) ←→ E1 (E7-22) No continuity
      VPA2 (E9-28) ←→ E1 (E7-22)

    OK

    REPLACE ACCELERATOR LINK ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  5. CHECK ECM (CHECK VOLTAGE)


    1. A01KGF1E02

      Turn the ignition switch ON.

    2. Check the voltage between terminals of the ECM connector as shown in the table and illustration.

      Voltage

      Terminal

      (Positive terminal ←→ Negative terminal)

      		 Voltage
      VCP1 (E9-8) ←→ EP1 (E9-27) 4.5 - 5.5 V

    NG

    CHECK AND REPLACE ECM Click here

    OK

  6. CHECK WIRE HARNESS (ECM - ACCELERATOR PEDAL POSITION SENSOR)


    1. A01KEY6E02

      Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the ECM (E9) connector.

    3. Check the continuity between terminals of the accelerator pedal position sensor and ECM connectors as shown in the illustration and table.

      Continuity (Check for open)

      Terminal

      (Accelerator pedal position sensor ←→ ECM)

      		 Standard
      VCP1 (4) ←→ VCP1 (E9-8) Continuity
      EP1 (1) ←→ EP1(E9-27)
      Continuity (Check for short)

      Terminal

      (ECM ←→ ECM(Ground))

      		 Standard
      VCP1 (E9-8) ←→ E1 (E7-22) No continuity
      EP1(E9-27) ←→ E1 (E7-22)

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    CHECK AND REPLACE ECM Click here

  7. CHECK ACCELERATOR LINK ASSEMBLY (CHECK VOLTAGE)


    1. A01KH3HE01

      Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch ON.

    3. Check the voltage between terminals of the accelerator pedal position sensor connector as shown in the table and illustration.

      Voltage

      Terminal

      (Positive terminal ←→ Negative terminal)

      		 Voltage
      VCP1 (4) ←→ Body ground 4.5 - 5.5 V
      VCP2 (6) ←→ Body ground

    NG

    CHECK ECM (CHECK VOLTAGE) Click here

    OK

  8. CHECK ECM (CHECK VOLTAGE)


    1. A01KGF1E01

      Turn the ignition switch ON.

    2. Check the voltage between terminals of the ECM connector as shown in the table and illustration.

      Voltage
      Accelerator pedal

      Terminal

      (Positive terminal ←→ Negative terminal)

      		 Voltage
      Fully closed VPA1 (E9-19) ←→ EP1 (E9-27) 0.5 - 1.1 V
      VPA2 (E9-28) ←→ EP2 (E9-24) 0.9 - 2.3 V
      Fully open VPA1 (E9-19) ←→ EP1 (E9-27) 3.0 - 4.6 V
      VPA2 (E9-28) ←→ EP2 (E9-24) 3.4 - 5.0 V

    OK

    CHECK AND REPLACE ECM Click here

    NG

  9. CHECK WIRE HARNESS (ECM - ACCELERATOR PEDAL POSITION SENSOR)


    1. A01KEY6E01

      Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the ECM (E9) connector.

    3. Check the continuity between terminals of the accelerator pedal position sensor and ECM connectors as shown in the illustration and table.

      Continuity (Check for open)

      Terminal

      (Accelerator pedal position sensor ←→ ECM)

      		 Standard
      VPA1 (5) ←→ VPA1 (E9-19) Continuity
      VPA2 (2) ←→ VPA2 (E9-28)
      Continuity (Check for short)

      Terminal

      (ECM ←→ ECM(Ground))

      		 Standard
      VPA1 (E9-19) ←→ E1 (E7-22) No continuity
      VPA2 (E9-28) ←→ E1 (E7-22)

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ACCELERATOR LINK ASSEMBLY

  10. CHECK ECM (CHECK VOLTAGE)


    1. A01KGF1E02

      Turn the ignition switch ON.

    2. Check the voltage between terminals of the ECM connector as shown in the table and illustration.

      Voltage

      Terminal

      (Positive terminal ←→ Negative terminal)

      		 Voltage
      VCP1 (E9-8) ←→ EP1 (E9-27) 4.5 - 5.5 V

    NG

    CHECK AND REPLACE ECM Click here

    OK

  11. CHECK WIRE HARNESS (ECU - ACCELERATOR PEDAL POSITION SENSOR)


    1. A01KEY6E02

      Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the ECM (E9) connector.

    3. Check the continuity between terminals of the accelerator pedal position sensor and ECM connectors as shown in the illustration and table.

      Continuity (Check for open)

      Terminal

      (Accelerator pedal position sensor ←→ ECM)

      		 Standard
      VCP1 (4) ←→ VCP1 (E9-8) Continuity
      EP1 (1) ←→ EP1(E9-27)
      Continuity (Check for short)

      Terminal

      (ECM ←→ ECM(Ground))

      		 Standard
      VCP1 (E9-8) ←→ E1 (E7-22) No continuity
      EP1(E9-27) ←→ E1 (E7-22)

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPAIR OR REPLACE ECM