Ecd System (W/O Dpf) Pre-Heating Control Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ECM TERMINAL VOLTAGE (GREL TERMINAL)

INSPECT GLOW RELAY (GLOW 1 or 2)

INSPECT FUSE (GLOW 1 and GLOW 2)

INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)

CHECK GLOW PLUG ASSEMBLY (INSTALLATION)

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

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

DESCRIPTION

HINT:

1. These troubleshooting procedures are for: 1) difficult engine starting 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 1 relay from the engine room relay block.
   

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

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   GLOW 1 relay (2) - Body ground	Ignition switch ON	11 to 14 V
   GLOW 2 relay (2) - Body ground	Ignition switch ON	11 to 14 V

1. Inspect the GLOW 1 relay (Click here).
   

2. Inspect the GLOW 2 relay (Click here).
   

1. Remove the GLOW 1 and GLOW 2 fuses from the engine room relay block.
   

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

   Standard Resistance:

   Component	Condition	Specified Condition
   GLOW 1 H-fuse	Always	Below 1 Ω
   GLOW 2 H-fuse	Always	Below 1 Ω

1. Inspect the glow plug assembly (Click here).
   

1. Check the glow plug installation (Click here).
   

   OK:

   Glow plugs are installed securely.
   

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

2. Disconnect the glow plug connector.
   

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

   Standard Resistance (Check for Open):

   No. 1

   Tester Connection	Condition	Specified Condition
   GLOW 1 relay (3) - C77-1	Always	Below 1 Ω
   GLOW 1 relay (5) - Positive (+) battery terminal cable	Always	Below 1 Ω
   GLOW 1 relay (1) - Body ground	Always	Below 1 Ω

4. Remove the GLOW 2 relay from the engine room relay block.
   

5. Disconnect the glow plug connector.
   

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

   Standard Resistance (Check for Open):

   No. 2

   Tester Connection	Condition	Specified Condition
   GLOW 2 relay (3) - C78-1	Always	Below 1 Ω
   GLOW 2 relay (5) - Positive (+) battery terminal cable	Always	Below 1 Ω
   GLOW 2 relay (1) - Body ground	Always	Below 1 Ω

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

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

3. Disconnect the ECM connector.
   

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

   Standard Resistance:

   
   

   for LHD

   Tester Connection	Condition	Specified Condition
   GLOW 1 relay (2) - C45-12 (GREL)	Always	Below 1 Ω
   GLOW 2 relay (2) - C45-23 (GRL2)	Always	Below 1 Ω
   GLOW 1 relay (2) or C45-12 (GREL) - Body ground	Always	10 kΩ or higher
   GLOW 2 relay (2) or C45-23 (GRL2) - Body ground	Always	10 kΩ or higher

   
   

   for RHD

   Tester Connection	Condition	Specified Condition
   GLOW 1 relay (2) - C46-12 (GREL)	Always	Below 1 Ω
   GLOW 2 relay (2) - C46-23 (GRL2)	Always	Below 1 Ω
   GLOW 1 relay (2) or C46-12 (GREL) - Body ground	Always	10 kΩ or higher
   GLOW 2 relay (2) or C46-23 (GRL2) - Body ground	Always	10 kΩ or higher