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Typical Malfunction Thresholds

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL MALFUNCTION THRESHOLDS

Communication signal Lost communication with TCM
  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0101) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester on.
    4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    5. Read DTCs.

      Result 

      RESULT REFERENCE

      Display (DTC output) Proceed to
      U0101 A
      U0101 and other DTCs B

    B : GO TO  DTC CHART  

    A : REPLACE ECM 

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