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

BME010290000W01

DTC U0073 | CAN BUS OFF
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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
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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". (See AFTER REPAIR PROCEDURE [AJ].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed)).)
No | Troubleshooting completed.