Ecd System Pre-Heating Control Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT GLOW RELAY

INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)

CHECK GLOW PLUG ASSEMBLY (INSTALLATION)

CHECK HARNESS AND CONNECTOR (GLOW RELAY - ECM AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (GLOW RELAY - GLOW PLUG AND BATTERY)

CHECK ECM (BATT VOLTAGE)

CHECK ECM (GREL VOLTAGE)

ECD SYSTEM - Pre-heating Control Circuit


DESCRIPTION

The glow plug is mounted inside the engine combustion chamber. To ensure efficient engine starting with a cold engine, the ECM calculates a time interval for the current that needs to flow through the glow plug depending on the starting engine coolant temperature when the ignition switch is turned to ON. The ECM then turns on the GLOW relay and permits the current to flow through the glow plug based on the ECM's calculated time. The GLOW relay is then heated, and enhances fuel combustion with a cold engine.
This DTC will be set if the glow plug or the circuit is open.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Pre-Heating Control Circuit

HINT:
  1. These troubleshooting procedures are for the following conditions: 1) difficulty starting the engine in cold weather, and 2) difficulty driving the vehicle or vehicle malfunctions in cold weather immediately after engine is started.
  2. After the engine is started, the ECM performs an "after-glow" for a certain period of time. In proportion to the actual engine coolant temperature, the time period varies. The after-glow reduces diesel engine knocking, white smoke emissions and engine noises when the engine is cold.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Pre-Heating Control Circuit


WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Pre-Heating Control Circuit


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  2. After replacing the ECM, the new ECM needs registration (Toyota Fortuner RM0000012XK04AX.html) and initialization (Toyota Fortuner RM000000TIN04KX.html).
1.INSPECT GLOW RELAY

  1. Inspect the glow plug relay (GLOW) (Toyota Fortuner RM0000014XH00QX.html).



NG
REPLACE GLOW RELAY
OK


2.INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)

  1. Inspect the glow plug (Toyota Fortuner RM0000013XN013X.html).



NG
REPLACE GLOW PLUG ASSEMBLY (Toyota Fortuner RM0000013XP017X.html)
OK


3.CHECK GLOW PLUG ASSEMBLY (INSTALLATION)

  1. Check the glow plug installation.

    OK:
    Glow plugs are installed securely.
Torque:
13 N*m{130 kgf*cm, 10 ft.*lbf}


NG
TIGHTEN GLOW PLUG
OK


4.CHECK HARNESS AND CONNECTOR (GLOW RELAY - ECM AND BODY GROUND)

  1. Disconnect the ECM connector.

  1. Remove the GLOW relay from the engine room relay block and junction block assembly.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    E4-15 (GREL) - GLOW relay (2)
    		Always
    		Below 1 Ω
    GLOW relay (1) - Body ground
    		Always
    		Below 1 Ω
    E4-15 (GREL) or GLOW relay (2) - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the GLOW relay.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (GLOW RELAY - GLOW PLUG AND BATTERY)

  1. Remove the GLOW relay from the engine room relay block and junction block assembly.

  1. Disconnect the glow plug connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    GLOW relay (3) - G1-1
    		Always
    		Below 1 Ω
    GLOW relay (5) - Positive (+) battery terminal cable
    		Always
    		Below 1 Ω
    GLOW relay (3) or G1-1 - Body ground
    		Always
    		Below 1 Ω

  1. Reinstall the GLOW relay.

  1. Reconnect the G1 glow plug connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK ECM (BATT VOLTAGE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Pre-Heating Control Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E5-2 (BATT) - E6-7 (E1)
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK ECM (GREL VOLTAGE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Pre-Heating Control Circuit

  1. Start the engine.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E4-15 (GREL) - E6-7 (E1)
    		Engine coolant temperature 40°C (104°F) or less
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
REPLACE ECM (Toyota Fortuner RM0000043H100CX.html)
OK

CHECK FOR INTERMITTENT PROBLEMS (Toyota Fortuner RM000000PDQ0QSX.html)