DTC U0073[MULTIPLEX COMMUNICATION SYSTEM (L3)]

id0902h5824800

Diagnostic trouble code

U0073
•  PCM
•  Instrument cluster

Module communication error
Detection Condition
Warning
•  Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.
•  Malfunction in the CAN system wiring harness
•  Related module communication error
POSSIBLE CAUSE
•  Open or short circuit in the wiring harness
•  Malfunction of connectors between CAN system modules
•  PCM malfunction
•  ABS HU/CM internal malfunction
•  Instrument cluster malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
VERIFY DTC
•  Are any DTCs, except the following, displayed?
―  U0073
Yes
Determine the location of malfunction.
(See PROCEDURES FOR DETERMINING LOCATION OF MALFUNCTION[MULTIPLEX COMMUNICATION SYSTEM (L3)].)
No
Go to the next step.
2
INSPECT CONNECTOR
•  Inspect the CAN system module connector indicated by the DTC.
•  Is it normal?
Yes
Go to the next step.
No
Replace the wiring harness, then go to Step 4.
3
INSPECT WIRING HARNESS
•  Inspect the CAN system wiring harness for the following items.
―  Short to ground
―  Short to power supply
―  Short in twisted pair cable
―  Open circuit
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the wiring harness, then go to the next step.
4
VERIFY THAT REPAIR OPERATION IS COMPLETED
•  Connect the connectors of each module.
•  Using the M-MDS, clear DTCs from the PCM memory.
•  Start the engine.
•  Are any of the CAN DTCs displayed?
Yes
Replace the module that output the CAN system DTCs again.
No
Troubleshooting completed.