Ecd System Pre-Heating Control Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT GLOW RELAY

INSPECT DIESEL GLW FUSE

INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)

CHECK GLOW PLUG ASSEMBLY (INSTALLATION)

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

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

CHECK ECM TERMINAL VOLTAGE (GREL TERMINAL)

DESCRIPTION

HINT:

1. These troubleshooting procedures are for: 1) difficult starting engine in cold weather, and 2) difficulty driving/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:

After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).

1. Remove the GLOW relay from the engine room R/B.
   

2. Measure the resistance of the relay.
   

   Standard resistance:

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

1. Remove the DIESEL GLW fuse from the engine room No. 1 R/B.
   

2. Measure the resistance of the 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 circuit, the engine power will be 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 E59 ECM connector.
   

2. Remove the GLOW relay.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   GREL (E59-56) - R/B GLOW relay terminal 2	Below 1 Ω
   R/B GLOW relay terminal 1 - Body ground	Below 1 Ω
   GREL (E59-56) - Body ground	10 kΩ or higher

1. Remove the GLOW relay.
   

2. Disconnect the A55 glow plug connector.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   R/B GLOW relay terminal 3 - Glow plug wire connector	Below 1 Ω
   R/B GLOW relay terminal 5 - Positive (+) battery terminal cable	Below 1 Ω

1. Start the engine.
   

2. Measure the voltage of the GLOW relay connector.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   2 - 1	Engine coolant temperature 40°C (104°F) or less	9 to 14 V