DTC U0100: Lost Communication with ECM / PCM "A": Procedure

1. Connect a Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Check for DTCs and note any codes that are output. Refer to DATA LIST / ACTIVE TEST .
4. Clear the DTC. Refer to DTC CHECK / CLEAR .
5. Recheck for DTC. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Proceed to
   DTC output	A
   DTC not output	B

B → See step   3 

A → See step   2