DTC U0073 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010290000W01

DTC U0073

CAN BUS OFF

DETECTION CONDITION

• CAN controller is damaged.
Diagnostic support note
• This is a continuous monitor (other).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• PENDING CODE is available if the PCM detects the above malfunction condition.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Short to ground circuit between TCM terminal 2M and PCM terminal 92
• Short to power circuit between TCM terminal 2J and PCM terminal 66
• CAN communication line short each other
• CAN controller damaged.

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Information and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnostic according to the available repair information.
• If the vehicle is not repaired, then go to the next step.
No
Go to the next step.
3
INSPECT POOR CONNECTION OF TCM CONNECTOR
• Turn the ignition switch off.
• Disconnect TCM connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminal, then go to Step 8.
No
Go to the next step.
4
CHECK CAN COMMUNICATION LINE FOR SHORT TO GROUND
• Check continuity between TCM connector terminal 2M and body ground.
• Is there continuity?
Yes
Repair or replace wiring harness, then go to Step 8.
No
Go to the next step.
5
CHECK CAN COMMUNICATION LINE FOR SHORT TO POWER
• Measure voltage between TCM connector terminal 2J and body ground.
• Is voltage B+?
Yes
Repair or replace wiring harness, then go to Step 8.
No
Go to the next step.
6
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn the ignition switch off.
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminal, then go to Step 8.
No
Go to the next step.
7
CHECK CAN COMMUNICATION LINE FOR SHORT EACH OTHER
• Check continuity between PCM connector terminal 66 and 92.
• Is there continuity?
Yes
Repair or replace wiring harness, then go to the next step.
No
Go to the next step.
8
VERIFY DTC U0073 DETECTED AGAIN
• Clear the DTC from the memory using the WDS or equivalent.
• Turn key to OFF, then start engine.
• Is same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.