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DTC U0073 [MZR-CD (RF Turbo)]

BME010290000203

DTC U0073 | CAN BUS OFF
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DETECTION CONDITION | • CAN controller is damaged. Diagnostic support note • MIL does not come on. • FREEZE FRAME DATA is not available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Short to ground circuit between DLC-2 terminal E and PCM terminal 39 • Short to power circuit between DLC-2 terminal F and PCM terminal 13 • CAN communication line short each other • CAN controller damaged.

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to the next step.
No | Go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Check for related Service Bulletins and/or on-line repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnostic according to available repair information. • If vehicle is not repaired, then go to the next step.
No | Go to the next step.
3 | INSPECT TCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the DLC-2 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair the terminal, then go to Step 8.
No | Go to the next step.
4 | CHECK CAN COMMUNICATION LINE FOR SHORT TO GROUND • Inspect for continuity between the following terminal (wiring harness-side) and body ground:

  - DLC-2 connector terminal E
  - DLC-2 connector terminal F

• Is there continuity?
Yes
Repair or replace the wiring harness, then go to Step 8.
No | Go to the next step.
5 | CHECK CAN COMMUNICATION LINE FOR SHORT TO POWER • Measure the voltage between the following terminal (wiring harness-side) and body ground:

  - DLC-2 connector terminal E
  - DLC-2 connector terminal F

• Is the voltage B+?
Yes
Repair or replace the wiring harness, then go to Step 8.
No | Go to the next step.
6 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair the terminal, then go to Step 8.
No | Go to the next step.
7 | CHECK CAN COMMUNICATION LINE FOR SHORT TO EACH OTHER • Inspect for continuity between PCM connector terminal 13 and 39 (wiring harness-side). • Is there continuity? | Yes | Repair or replace the 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 PCM memory using the WDS or equivalent. • Turn the engine switch off, then start the engine. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step.
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.