Subaru Crosstrek Service Manual: Dtc u0073 control module communication bus off
LAN SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF
DTC DETECTING CONDITION:
Integrated unit communication is shut down because of high speed CAN error.
TROUBLE SYMPTOM:
CAN communication is not normal.
| STEP | CHECK | YES | NO |
1.CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.
Was the basic diagnostic procedure performed up to STEP 3?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF">Go to Step 2.
Perform the basic diagnostic procedure. Basic Diagnostic Procedure">
2.CHECK DTC.
1) Start the engine.
2) Using the Subaru Select Monitor, read DTC of CAN system. Read Diagnostic Trouble Code (DTC)">
Is U0073 a current malfunction?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF">Go to Step 3.
It may be a temporary poor contact. Perform the clear memory. Clear Memory Mode">
3.CHECK CAN COMMUNICATION CIRCUIT.
Check CAN communication circuit. CAN Communication Circuit Check > PROCEDURE">
Is CAN communication circuit faulty?
Repair the faulty portion, following the diagnosis procedure.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF">Go to Step 4.
4.CHECK DTC.
1) Perform the inspection using the DTC check sheet. List of Diagnostic Trouble Code (DTC) > LIST">
2) Using the Subaru Select Monitor, read DTC of CAN system. Read Diagnostic Trouble Code (DTC)">
Is U0073 a current malfunction?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF">Go to Step 5.
System is normal.
5.CHECK CONTROL MODULE.
1) Turn the ignition switch to OFF.
2) Disconnect the control modules other than body integrated unit in order.
NOTE:
When disconnecting ECM or VDC CM, connect resistance of 120 ? between CAN Hi and CAN Lo as an alternative of end resistance.
3) Turn the ignition switch to ON.
4) Using the Subaru Select Monitor, read DTC of CAN system. Read Diagnostic Trouble Code (DTC)">
Is there any control module that U0073 is not detected as current malfunction?
Replace the control module.
Repeat 1) to 4) in step 3 until U0073 is not detected.
Dtc u0427 invalid data received from vehicle security control module
LAN SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULEDTC DETECTING CONDITION:Defective data was tran ...
Dtc u0428 invalid data received from steering angle sensor module
LAN SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC U0428 INVALID DATA RECEIVED FROM STEERING ANGLE SENSOR MODULEDTC DETECTING CONDITION:Defective data was transmi ...
Other materials:
Removal
COMMUNICATION SYSTEM > HornREMOVALCAUTION:Do not remove the bumper face - front when removing the horn, in order to prevent damaging the claws of the bracket - front bumper corner and the bracket - front bumper side.1. Disconnect the ground cable from battery. NOTE">2. Remove the clip, a ...
Dtc c1721 yaw rate sensor
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC C1721 YAW RATE SENSORDTC DETECTING CONDITION:Defective yaw rate & G sensorTROUBLE SYMPTOM:• ABS does not operate.• VDC does not operate.• Hill start assist does not oper ...
Removal
CONTROL SYSTEMS > MT Gear Shift LeverREMOVAL1. Disconnect the ground cable from battery. NOTE">NOTE:For model with battery sensor, disconnect the ground terminal from battery sensor.2. Remove the console box. Console Box > REMOVAL">3. Remove the gear shift knob and remove the ...
