PRE-HEATING SYSTEM ON-VEHICLE INSPECTION

PROCEDURE


  1. CHECK ILLUMINATION TIME OF GLOW INDICATOR LIGHT


    1. Check the light illumination duration.


      1. Turn the engine switch to on (IG) and measure the light illumination time.

        Light illumination time
        See graph.
        A01WWMIE03
        Text in Illustration
        *A w/ DPF *B w/o DPF
        *a Seconds *b

        Engine Coolant Temperature

        °C (°F)
        *c Light Illumination Time - -

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

        Tech Tips

        Actual light illumination duration may vary slightly from the graph.

      2. Turn the engine switch off.

  2. CHECK PRE-HEATING


    1. Inspect the pre-heating time.


      1. Turn the engine switch to on (IG). Measure how long it takes for the battery voltage to be applied to the glow plug assemblies.

        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)

        Tech Tips

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

        A01WPUYE02
        Text in Illustration
        *a Seconds *b

        Battery Voltage

        (V)
        *c After Glow Time - -

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

      2. Turn the engine switch off.

  3. CHECK AFTER GLOW TIME


    1. A01WVT4E02
      Text in Illustration
      *1 No. 2 Glow Relay (GLOW NO. 2)
      *2 No. 1 Glow Relay (GLOW NO. 1)
      *3 Engine Room Relay Block

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

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

    3. 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
      A01WP8FE02
      Text in Illustration
      *A w/ DPF *B w/o DPF
      *a Seconds *b

      Engine Coolant Temperature

      °C (°F)
      *c After Glow Time - -

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