Abbreviations
DescriptionDTC/Circuit diagnosis
U0073 COMMUNICATION BUS A OFF
DTC Logic
DTC DETECTION LOGIC
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detection condition
Possible causes
U0073
COMM BUS A OFF
(Control Module Communication
Bus A Off)
TCM communication blockage lasts for 2 sec ...
Ecm branch line circuit
Diagnosis Procedure
1.CHECK CONNECTOR
Turn the ignition switch OFF.
Disconnect the battery cable from the negative terminal.
Check the terminals and connectors of the ECM for damage, bend and loose
connection (unit side and
connector side).
Is the inspection result normal?
YES > ...
FM/AM radio with compact disc (CD) player (if so equipped)
CD eject button
CD insert slot
SCAN button
DISP button
RPT/RDM button
TUNE/FOLDER knob / MENU button
AUX IN jack
AUX button
CD button
AM button
FM button
VOL (volume) control knob
/ (power) button
Station select (1 - 6) buttons
TRACK button
SEEK button
For ...