ECD SYSTEM, Diagnostic DTC:18 (5)

DTC Code DTC Name
18 (5) Spill Control Circuit Malfunction

DESCRIPTION

The ECM controls the fuel injection volume by operating the spill control valve. The spill control valve is mounted on the injection pump, and opens or closes the injection pressure releasing port with the solenoid valve in the spill control valve. During injection, valve is closed (ON). The ECM decides the basic fuel injection volume based on the engine rpm and accelerator pedal opening angle, and calculates the final fuel injection angle to add the various corrections on the basic fuel injection volume. The ECM counts the NE pulse to detect the angle from injection starts and operates the spill control valve from ON to OFF (the injection pressure releasing port is open) at the position which watches the final fuel injection angle.

A01DXBCE01
DTC No. DTC Detection Condition Trouble Area
18 (5) Open or short in spill control valve at 500 rpm or more

  • Open or short in spill control valve circuit

  • Spill control valve

  • ECM

WIRING DIAGRAM

A01DWLPE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT SPILL CONTROL VALVE


    1. A01DY12E01

      Disconnect the spill control valve connector.

    2. Measure the resistance of the spill control valve.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 1 to 2 Ω

      Tech Tips

      The spill control valve is integrated with the injection pump. If the spill control valve needs to be replaced, the entire injection pump must be replaced.


    NG

    REPLACE INJECTION PUMP ASSEMBLY

    OK

  2. CHECK ECM (SPV+ VOLTAGE)


    1. A01E2VTE44

      Disconnect the S26 spill control valve connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Specified Condition
      E23-12 (SPV+) - E23-14 (E1) 9 to 14 V

    NG

    REPLACE ECM

    OK

  3. CHECK ECM (SPV- VOLTAGE)


    1. A01DYF4E03

      Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Specified Condition
      E23-25 (SPV-) - E23-14 (E1) 9 to 14 V

    3. While idling, measure the waveform with an oscilloscope connected between the specified terminals of ECM connector.

      OK
      Tester Connection Specified Condition
      SPV- (E23-25) - E1 (E23-14) Correct waveform is as shown

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  4. CHECK WIRE HARNESS (ECM - SPILL CONTROL VALVE)


    1. A01E1YPE03

      Disconnect the S26 spill control valve connector.

    2. Disconnect the E23 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      S26-2 - E23-12 (SPV+) Below 1 Ω
      S26-1 - E23-25 (SPV-) Below 1 Ω
      E23-12 (SPV+) - Body ground 10 kΩ or higher
      E23-25 (SPV-) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM