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Home >> Lexus >> 2006 >> IS 250 RWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Automatic Transmission) >> Automatic Transmission System >> DTC U0100 Lost Communication with ECM/PCM "A" >> Typical Malfunction Thresholds

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 between ECM and TCM No communication
  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0100) 
    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 

      PROBLEM SYMPTOM CHART

      Display (DTC output) Proceed to
      U0100 A
      U0100 and other DTCs B

    B : GO TO  DTC CHART  

    A : REPLACE ECM 

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