Ecd System Pre-Heating Control Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT GLOW RELAY (Marking: GLOW)

INSPECT FUSE (GLOW)

INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)

CHECK GLOW PLUG ASSEMBLY (INSTALLATION)

CHECK WIRE HARNESS (GLOW RELAY (Marking: GLOW) - ECM AND BODY GROUND)

CHECK WIRE HARNESS (GLOW RELAY (Marking: GLOW) - GLOW PLUG AND BATTERY)

CHECK ECM (GREL VOLTAGE)

CHECK ECM (BATT VOLTAGE)

DESCRIPTION

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.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

If the ECM is replaced, the new ECM needs initialization (Toyota Fortuner RM0000012X2005X.html).

1. Remove the glow relay from the engine room relay block.
   

2. Measure the resistance of the relay.
   

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

1. Remove the GLOW H-fuse from the engine room junction block.
   

2. Measure the resistance of the H-fuse.
   

   Standard resistance:

   Below 1 Ω
   

1. Disconnect the glow plug wire.
   

2. Measure the resistance of the glow plugs.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   Glow plug terminal - Body ground	20°C (68°F)	Approximately 0.95 Ω

   HINT:

   If any of the glow plugs has an open malfunction, the engine power is insufficient only when the engine is cold.

   NOTICE:

   1. Exercise extreme care not to damage the glow plug pipes. Damaging them could cause an open circuit, or shorten the life of the glow plugs.
      
   2. Keep the glow plugs free of oil and fuel while cleaning.
      
   3. Wipe any oil off of the terminal and Bakelite washer with a clean, dry cloth during inspection.
      
   4. Do not apply more than 11 V to the glow plugs as it may cause an open circuit.
      

1. Check the glow plug installation.
   

   OK:

   Glow plugs are installed securely.
   

Torque:

13 N*m{130 kgf*cm, 10 ft.*lbf}

1. Disconnect the E4 ECM connector.
   

2. Remove the glow relay from the engine room relay block.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   E4-15 (GREL) - Relay block glow relay terminal 2	Below 1 Ω
   Relay block glow relay terminal 1 - Body ground	Below 1 Ω
   E4-15 (GREL) - Body ground	10 kΩ or higher

1. Remove the glow relay from the engine room relay block.
   

2. Disconnect the G1 glow plug connector.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   Relay block glow relay terminal 3 - Glow plug wire connector	Below 1 Ω
   Relay block glow relay terminal 5 - Positive (+) battery terminal cable	Below 1 Ω

1. Start the engine.
   

2. Measure the voltage of the ECM connectors.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   E4-15 (GREL) - E6-7 (E1)	Engine coolant temperature 40°C (104°F) or less	9 to 14 V

1. Measure the voltage of the ECM connectors.
   

   Standard voltage:

   Tester Connection	Specified Condition
   E5-2 (BATT) - E6-7 (E1)	9 to 14 V