ECD SYSTEM, Diagnostic DTC:18

DTC Code DTC Name
18 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 close ON. The ECM decides the basic fuel injection volume by 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.

A01BF79E01
DTC No. DTC Detection Condition Trouble Area
18 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

A01BGSTE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT SPILL CONTROL VALVE


    1. A01BAUUE01

      Disconnect the spill control valve connector.

    2. Measure the resistance according to the value(s) in the table below.

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

      Tech Tips

      The spill control valve is integrated with the injection pump. If the spill control valve is replaced, the injection pump must be replaced in whole.


    NG

    REPLACE INJECTION PUMP ASSEMBLY

    OK

  2. INSPECT ECM


    1. A01BCNHE03

      Disconnect the spill control valve connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Specified Condition
      SPV+ (D2-12) - E1 (D2-14) 9 to 14 V

    NG

    REPLACE ECM

    OK

  3. INSPECT ECM


    1. A01BASXE01

      Turn the ignition switch ON.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Specified Condition
      SPV- (D2-25) - E1 (D2-14) 9 to 14 V

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

      OK
      Tester Connection Specified Condition
      SPV- (D2-25) - E1 (D2-14) Correct waveform shown

    NG

    CHECK HARNESS AND CONNECTOR (ECM - SPILL CONTROL VALVE) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS

  4. CHECK HARNESS AND CONNECTOR (ECM - SPILL CONTROL VALVE)


    1. A01BB1WE01

      Disconnect the spill control valve connector.

    2. Disconnect the ECM D2 connector.

    3. Measure the resistance to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      SPV+ (D59-2) - SPV+ (D2-12) Below 1 Ω
      SPV- (D59-1) - SPV- (D2-25) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      SPV+ (D2-12) - Body ground 10 kΩ or higher
      SPV- (D2-25) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM