Ecd System (W/ Egr Cooler) Pre-Heating Control Circuit

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
1Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

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 (w/ EGR Cooler) - 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 of the ECM. 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.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) 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.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) Pre-Heating Control Circuit


WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) 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 (HILUX_TGN26 RM0000012XK040X.html) and initialization (HILUX_TGN26 RM000000TIN04CX.html).
1.INSPECT GLOW RELAY

  1. Inspect the glow plug relay (GLOW) (HILUX_TGN26 RM000003BIA01SX_01_0004.html).



NG
REPLACE GLOW RELAY
OK


2.INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)

  1. Inspect the glow plug (HILUX_TGN26 RM0000013XN017X_01_0001.html).



NG
REPLACE GLOW PLUG ASSEMBLY (HILUX_TGN26 RM0000013XP01BX.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
    G39-15 (GREL) - GLOW relay (2)
    		Always
    		Below 1 Ω
    GLOW relay (1) - Body ground
    		Always
    		Below 1 Ω
    G39-15 (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) - C21-1
    		Always
    		Below 1 Ω
    GLOW relay (5) - Positive (+) battery terminal cable
    		Always
    		Below 1 Ω
    GLOW relay (3) or C21-1 - Body ground
    		Always
    		Below 1 Ω

  1. Reinstall the GLOW relay.

  1. Reconnect the glow plug connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK ECM (BATT VOLTAGE)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) Pre-Heating Control Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G38-2 (BATT) - C23-7 (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)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) 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
    G39-15 (GREL) - C23-7 (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 (HILUX_TGN26 RM0000013Z0019X.html)
OK

CHECK FOR INTERMITTENT PROBLEMS (HILUX_TGN26 RM000000PDQ0PVX.html)