DTC U0073 [MULTIPLEX COMMUNICATION SYSTEM]

id0902e6824800

DTC

U0073

PCM

TCM (ATX only)

DSC HU/CM

4WD control module

BCM

SAS control module

Keyless control module (with advanced keyless)

Instrument cluster

CAN system communication error

DETECTION CONDITION

Warning

•  Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only detection conditions may cause injury due to operating error, or damage the system. When performing an inspection, always follow the inspection procedure.

•  CAN system related harness malfunction

•  Related module communication error

POSSIBLE CAUSE

•  Open or short circuit in wiring harness

•  Malfunction of connectors between PCM, TCM (ATX only), DSC HU/CM, 4WD control module, BCM, SAS control module, Keyless control module (with advanced keyless), instrument cluster

•  PCM malfunction

•  TCM (ATX only) malfunction

•  DSC HU/CM malfunction

•  4WD control module malfunction

•  BCM malfunction

•  SAS control module malfunction

•  Keyless control module (with advanced keyless) malfunction

•  Instrument cluster malfunction

DTC	U0073	PCM TCM (ATX only) DSC HU/CM 4WD control module BCM SAS control module Keyless control module (with advanced keyless) Instrument cluster	CAN system communication error
DETECTION CONDITION	Warning • Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only detection conditions may cause injury due to operating error, or damage the system. When performing an inspection, always follow the inspection procedure. • CAN system related harness malfunction • Related module communication error
POSSIBLE CAUSE	• Open or short circuit in wiring harness • Malfunction of connectors between PCM, TCM (ATX only), DSC HU/CM, 4WD control module, BCM, SAS control module, Keyless control module (with advanced keyless), instrument cluster • PCM malfunction • TCM (ATX only) malfunction • DSC HU/CM malfunction • 4WD control module malfunction • BCM malfunction • SAS control module malfunction • Keyless control module (with advanced keyless) malfunction • Instrument cluster malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT CAN SYSTEM-RELATED DTC • Are any DTCs other than the following displayed? ― U0073	Yes	Determine malfunctioning part in CAN system. (See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION [MULTIPLEX COMMUNICATION SYSTEM])
1		No	Go to the next step.
2	INSPECT CONNECTOR • Inspect the connector of the module that outputs the DTC. • Is it normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 4.
3	INSPECT WIRING HARNESSES • Inspect for the following malfunctioning wiring harnesses: ― Short to GND ― Short to power supply ― Twisted pair short each other ― Open circuit • Is there any malfunction?	Yes	Repair or replace the wiring harness, then go to the next step.
3		No	Go to the next step.
4	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC using the M-MDS. • Is the same DTC present?	Yes	Replace the module that outputs the DTC, then retry this step.
4		No	Troubleshooting completed.