DTC U0073/94, U0100/65: Control Module Communication Bus OFF; Lost Communication with ECM/PCM: Description

WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

The translate ECU inputs the signals from the ECM via the CAN communication system.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE

DTC No.	DTC Detection Condition	Trouble Area
U0073/94	When using translate ECU to determine malfunction: Both of following conditions are met: After translate ECU completes output signal, signal is not sent for 5 seconds or more Bus off condition occurs one time or more within 100 msec., and this occurs 10 times in a row When using VSC ECU to determine malfunction: When IG1 voltage is 0.5 V or more and vehicle speed is 15 km/h (9 mph) or more, signals from malfunctioning translate ECU (as described above) are received continuously for 2 seconds or more	Communication line between engine control ECU and Translate ECU (CAN communication line)
U0100/65	When using translate ECU to determine malfunction: Both of following conditions are met: Condition that signals cannot be sent to engine control ECU occurs continuously for 2 seconds or more Condition that signals cannot be received from engine control ECU occurs continuously for 2 seconds or more When using VSC ECU to determine malfunction: When IG1 voltage is 0.5 V or more and vehicle speed is 15 km/h (9 mph) or more, signals from malfunctioning translate ECU (as described above) are received continuously for 2 seconds or more	Communication line between engine control ECU and Translate ECU (CAN communication line)

HINT:

*: For CAN communication malfunctions, after the malfunction is determined using the translate ECU, the results are sent to the VSC ECU. In total, this takes 7 seconds.