Diesel Data: Automotive Repair

Idle Speed: Testing and Inspection

INSPECT ENGINE IDLE SPEED
a. Warm up the engine.





b. When using the hand-held tester:
Check the idle speed.
1. Connect the hand-held tester to the DLC3.
2. Enter DATA LIST MODE on the hand-held tester.





Idle speed

NOTICE:
^ When checking the idle speed, the transmission should be in the neutral position.
^ Check the idle speed with the cooling fan off.
^ Switch off all accessories and air conditioning before connecting the hand-held tester.

HINT: Please refer to the hand-held tester operator's manual for further details.





c. When not using the hand-held tester: Check the idle speed.
1. Using SST, connect tachometer test probe to terminal 9 (TAC) of the DLC3.
SST 09843-18030
2. Check the idle speed.





Idle speed