DIESEL THROTTLE BODY ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT DIESEL THROTTLE BODY ASSEMBLY

   
   

   1. Inspect the diesel throttle body (using the intelligent tester).

      
      

      1. Turn the ignition switch to ON.

      2. Turn the ignition switch off and wait for 5 seconds or more.

         Tech Tips

         Be sure to turn off the ignition switch before performing this inspection. The fully closed position of the diesel throttle valve is learned when the ignition switch is turned off.

      3. Connect the intelligent tester to the DLC3.

      4. Turn the ignition switch to ON and turn the tester on.

      5. Enter the following menus: Powertrain / Engine and ECT / Data List / Actual Throttle Position.

      6. Read the values.

         Standard
         Engine Condition Specified Condition Ignition switch ON -5 to 5% Idling (after engine warmed up, at elevation near sea level) 55 to 90% Accelerator pedal fully depressed -5 to 5% (value changes smoothly in transition)

         Tech Tips

         Actual Throttle Position in the Data List should be interpreted as follows:

         Throttle Valve Condition	Actual Throttle Position
         Fully closed	100%
         Fully open	0%

      7. Enter the following menus: Powertrain / Engine and ECT / Data List / Throttle Close Learning Val. and Diesel Throttle Learn Status.

      8. Read the values when the ignition switch is ON.

         OK
         Diesel Throttle Learn Status is OK.

         Note

         Extremely cold conditions might cause the throttle valve movement to be delayed.

         Tech Tips

         
         

         • When Diesel Throttle Learn Status is NG, the value of Throttle Close Learning Val. is unavailable because the throttle fully closed position learned value is out of the standard range.

         • When Diesel Throttle Learn Status is NG, the ECM suspends the learning value update. The value indicated on the tester is the past data from when the diesel throttle was working properly or the initialized data remaining from when the battery cable was reconnected, i.e., the value is not current data.

         • If the diesel throttle condition is normal, the fully closed position is learned when the ignition switch is turned off and 5 seconds or more elapse.

         If the result is not as specified, replace the diesel throttle body assembly.

   2. Inspect the diesel throttle body assembly (not using the intelligent tester).

      
      

      1. Inspect the throttle valve operation visually.

         OK
         No malfunction.

         If the result is not as specified, replace the diesel throttle body assembly.