Dtc 18 (5) Spill Control Circuit Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT SPILL CONTROL VALVE

CHECK ECM (SPV+ VOLTAGE)

CHECK ECM (SPV- VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - SPILL CONTROL VALVE)

DTC 18 (5) Spill Control Circuit Malfunction


DESCRIPTION

The ECM operates the spill control valve to control fuel injection volume. The spill control valve is mounted on the injection pump. The spill control valve's solenoid valve opens and closes the injection pressure release port. During fuel injection , the spill control valve is ON (closed). The ECM determines the basic fuel injection amount based on the engine speed and acceleration pedal opening angle. Then the ECM uses several other correctional factors to determine the final fuel injection amount. After fuel injection has begun, the ECM ensures the final fuel injection amount by performing the following: 1) by counting the number of NE signals, and 2) by operating the spill control valve from ON (close) to OFF (open) (injection pressure release port is open).

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 18 (5) Spill Control Circuit Malfunction


DTC No.
DTC Detection Condition
Trouble Area
18 (5)
Open or short in spill control valve at 500 rpm or more
  1. Open or short in spill control valve circuit
  2. Spill control valve
  3. ECM

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 18 (5) Spill Control Circuit Malfunction


INSPECTION PROCEDURE

1.INSPECT SPILL CONTROL VALVE


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 18 (5) Spill Control Circuit Malfunction

  1. Disconnect the S24 spill control valve connector.

  1. 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
    HINT:
    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)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 18 (5) Spill Control Circuit Malfunction

  1. Disconnect the S24 spill control valve connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E20-12 (SPV+) - E20-14 (E1)
    		9 to 14 V


NG
REPLACE ECM
OK


3.CHECK ECM (SPV- VOLTAGE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 18 (5) Spill Control Circuit Malfunction

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E20-25 (SPV-) - E20-14 (E1)
    		9 to 14 V
    Tool Setting
    		Condition
    20 V/DIV., 10 msec./DIV.
    		During idling

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

    OK:
    Tester Connection
    		Specified Condition
    E20-25 (SPV-) - E20-14 (E1)
    		Correct waveform is as shown


OK
CHECK FOR INTERMITTENT PROBLEMS
NG


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


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 18 (5) Spill Control Circuit Malfunction

  1. Disconnect the S24 spill control valve connector.

  1. Disconnect the E20 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    S24-2 - E20-12 (SPV+)
    		Below 1 Ω
    S24-1 - E20-25 (SPV-)
    		Below 1 Ω
    S24-2 or E20-12 (SPV+) - Body ground
    		10 kΩ or higher
    S24-1 or E20-25 (SPV-) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM