2009 Toyota Corolla S, 1.8 U, StandardFACTORY OEM SERVICE PROCEDURE

DTC U0073/94 Control Module Communication Bus OFF: Description

The skid control ECU receives signals sent from the ECM via the CAN communication system. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

DTC DETECTION CONDITION CHART

DTC Code DTC Detection Condition Trouble Area
U0073/94 Either of the following is detected:
  1. When the IG1 terminal voltage is between 10 and 17.4 V, after the output of data from the skid control ECU is completed, the sending continues for 5 seconds or more.
  2. When the IG1 terminal voltage is between 10 and 17.4 V, the condition that bus OFF state occurs once or more within 0.1 seconds occurs 10 times in succession. (Sent signals cannot be received.)
 CAN communication system
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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