Pre-Heating System On-Vehicle Inspection

Check the light illumination duration.

1. Turn the ignition switch to ON and measure the light illumination time.
   

   Light illumination time:

   See graph.
   

   
   
   
   
   
   
   

   Text in Illustration

   *A	w/ DPF	*B	w/o DPF
   *1	Seconds	*2	Engine Coolant Temperature °C (°F)
   *3	Light Illumination Time	-	-

   1. If the result is not as specified, check the ECM, engine coolant temperature sensor, glow plug assembly and glow relay.
      

   HINT:

   Actual light illumination duration may vary slightly from the graph.

2. Turn the ignition switch off.
   

Inspect the pre-heating time.

1. Turn the ignition switch to ON. Measure how long it takes for the battery voltage to be applied to the glow plugs.
   

   Standard Pre-Heating Time:

   Engine Coolant Temperature	Specified Condition
   40°C (104°F) or higher	1 second
   Below 40°C (104°F)	See graph* (Maximum: 21 seconds)

   HINT:

   *: The pre-heating time changes depending on the battery voltage.

   
   
   
   
   
   
   

   Text in Illustration

   *1	Seconds	*2	Battery Voltage (V)
   *3	After Glow Time	-	-

   1. If the result is not as specified, check the ECM, engine coolant temperature sensor, glow plug assembly and glow relay.
      

2. Turn the ignition switch off.
   

Remove the No. 1 glow relay (GLOW NO. 1) from the engine room relay block.

Remove the No. 2 glow relay (GLOW NO. 2) from the engine room relay block.

After the engine starts, measure the time duration that battery voltage remains present.

Standard After Glow Time:

Tester Connection	Condition	Specified Condition
2 - Body ground	After engine starts	Refer to graph below
2 - Body ground