ECD SYSTEM, Diagnostic DTC:97

DTC Code DTC Name
97 EDU Circuit Malfunction

DESCRIPTION

The ECU has been adopted to drive the injector at high speeds. The EDU has realized high-speed driving under high fuel pressure conditions through the use of a DC/DC converter that provides a high-voltage, quick-charging system.

The ECM constantly monitors the EDU and stops the engine in case an abnormal condition is detected.

DTC No. DTC Detecting Condition Trouble Area
97 Open or short in EDU circuit

  • Open or short in EDU circuit

  • EDU

  • Open or short in suction control valve circuit

  • Suction control valve

  • Fuel relief valve (built into common rail)

  • Injector

  • ECM

WIRING DIAGRAM

A01KFI9E01
A01KICBE01

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 ration was lean or rich, etc. at the time of the malfunction.

PROCEDURE


  1. CHECK SPILL VALVE CONTROL DRIVER ASSEMBLY (CHECK VOLTAGE POWER SOURCE)


    1. A01KGRWE01

      Disconnect the EDU (E2) connector.

    2. Turn the ignition switch ON.

    3. Check the voltage between terminals of the EDU connector as shown in the table and illustration.

      Voltage

      Terminal

      (Positive terminal ←→ Negative terminal)

      		 Voltage
      +B (E2-8) ←→ GND (E2-6) 9 - 14 V

    NG

    CHECK EDU POWER SOURCE CIRCUIT Click here

    OK

  2. CHECK SPILL VALVE CONTROL DRIVER ASSEMBLY (CHECK RESISTANCE)


    1. A01KGRWE02

      Disconnect the EDU (E2) connector.

    2. Check the resistance between terminals of the EDU connector as shown in the table and illustration.

      Resistance (at 20°C (68°F))
      Terminal Resistance
      COM (E2-1) ←→ 2 2.5 - 3.1 Ω
      INJ#1 (E2-5) ←→ 2
      INJ#2 (E2-4) ←→ 2
      INJ#3 (E2-3) ←→ 2
      INJ#4 (E2-2) ←→ 2

    OK

    CHECK INJECTION PUMP ASSEMBLY (SUCTION CONTROL VALVE) Click here

    NG

  3. CHECK INJECTOR ASSEMBLY


    1. A01KHV3E01
      Text in Illustration
      *1 Ohmmeter

      Disconnect the 4 injector connectors.

    2. Using an ohmmeter, measure the resistance between terminals as shown.

      Resistance
      2.5 - 3.1 Ω at 20°C (68°F)
    3. A01KF0BE01
      Text in Illustration
      *1 Ohmmeter
      *a No Continuity

      Using an ohmmeter, check that there is no continuity between the injector terminal and ground as shown.


    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    NG

    REPLACE INJECTOR ASSEMBLY

  4. CHECK INJECTION PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. A01KGSWE01
      Text in Illustration
      *1 Ohmmeter

      Disconnect the suction control valve connector.

    2. Using an ohmmeter, measure the resistance between terminals as shown.

      Resistance
      1.95 - 2.27 Ω at 20°C (68°F)
    3. A01KHSKE01
      Text in Illustration
      *1 Ohmmeter
      *a No Continuity

      Using an ohmmeter, check that there is no continuity between the terminal and ground as shown.


    NG

    REPLACE SUCTION CONTROL VALVE (See FUEL - SUCTION CONTROL VALVE - REPLACEMENT)

    OK

  5. CHECK COMMON RAIL ASSEMBLY (FUEL RELIEF VALVE)


    1. A01KEQTE01
      Text in Illustration
      *1 Ohmmeter

      Disconnect the fuel relief valve connector.

    2. Using an ohmmeter, measure the resistance between terminals as shown.

      Resistance
      2.6 - 2.8 Ω at 20°C (68°F)
    3. A01KH23E01
      Text in Illustration
      *1 Ohmmeter
      *a No Continuity

      Using an ohmmeter, check that there is no continuity between the terminal and ground as shown.


    NG

    REPLACE COMMON RAIL ASSEMBLY Click here

    OK

  6. CHECK WIRE HARNESS (ECM - SCV) (a) (ECM - FUEL RELIEF VALVE) (b)


    1. A01KG5ME01

      Check for open and short in harness and connector between ECM and SCV.


      1. Disconnect the SCV connector.

      2. Disconnect the ECM (E7) connector.

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

        Continuity (Check for open)

        Terminal

        (SCV ←→ ECM)

        		 Standard
        2 ←→ PCV- (E7-9) Continuity
        1 ←→ PCV+ (E7-8)
        Continuity (Check for short)

        Terminal

        (ECM ←→ ECM(Ground))

        		 Standard
        PCV- (E7-9) ←→ E1 (E7-22) No continuity
        PCV+ (E7-8) ←→ E1 (E7-22)
    2. A01KHQBE01

      Check for open and short in harness and connector between the ECM and fuel relief valve.


      1. Disconnect the fuel relief valve connector.

      2. Disconnect the ECM (E8) and (E7) connectors.

      3. Check the continuity between terminals of fuel relief valve and ECM connectors as shown in the illustration and table.

        Continuity (Check for open)

        Terminal

        (Fuel relief valve ←→ ECM)

        		 Standard
        3 ←→ PRV (E8-4) Continuity
        4 ←→ COM (E7-7)
        Continuity (Check for short)

        Terminal

        (ECM ←→ ECM(Ground))

        		 Standard
        PRV (E8-4) ←→ E1 (E7-22) No continuity
        COM (E7-7) ←→ E1 (E7-22)

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  7. CHECK ECM (CHECK VOLTAGE)


    1. A01KHWFE01

      During cranking or idling, check the waveform between terminals #1, #2, #3, #4 and E01 of the ECM (E7) connector with the oscilloscope.

      Voltage
      The correct waveform are as shown.

    NG

    CHECK AND REPLACE ECM Click here

    OK

  8. CHECK ECM (CHECK VOLTAGE)


    1. A01KGMBE01

      During cranking or idling, check the wave form between terminals INJF and E01 of the ECM (E7) connector with the oscilloscope.

      Voltage
      The correct waveform are as shown.

    NG

    CHECK AND REPLACE ECM Click here

    NG

  9. CHECK WIRE HARNESS (ECM - EDU)


    1. A01KFL6E01

      Disconnect the EDU (E3) connector.

    2. Disconnect the ECM (E7) connector.

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

      Continuity (Check for open)

      Terminal

      (EDU ←→ ECM)

      		 Standard
      IJF (E3-1) ←→ INJF (E7-18) Continuity
      IJT#1 (E3-2) ←→ #1 (E7-15)
      IJT#2 (E3-3) ←→ #2 (E7-14)
      IJT#3 (E3-4) ←→ #3 (E7-13)
      IJT#4 (E3-5) ←→ #4 (E7-12)
      Continuity (Check for short)

      Terminal

      (ECM ←→ ECM(Ground))

      		 Standard
      INJF (E7-18) ←→ E1 (E7-22) No continuity
      #1 (E7-15) ←→ E1 (E7-22)
      #2 (E7-14) ←→ E1 (E7-22)
      #3 (E7-13) ←→ E1 (E7-22)
      #4 (E7-12) ←→ E1 (E7-22)

    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE SPILL VALVE CONTROL DRIVER ASSEMBLY Click here