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DTC U0073 (85)

BME040243000218

DTC | U0073 (85) | CAN communication system
DETECTION CONDITION | • CAN controller is damaged.
POSSIBLE CAUSE | • Short to ground circuit between ABS/TCS HU/CM terminal R and PCM terminal 39 • Short to power circuit between ABS/TCS HU/CM terminal O and PCM terminal 13 • CAN communication line short each other • Malfunction of ABS/TCS HU/CM and/or PCM.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | CHECK FOR PCM FOR DTCs • Turn ignition key to OFF. • Connect WDS or equivalent to DLC-2 • Turn ignition key to ON (engine off). • Is DTC U0073 for engine control system obtained? | Yes | Follow inspection procedures for engine control system. (See DTC U0073 [MZR-CD (RF Turbo)].)
No | Go to next step.
2 | CHECK CAN COMMUNICATION LINE FOR SHORT TO GROUND • Disconnect ABS/TCS HU/CM and PCM connector. • Check continuity between the following terminal (harness-side) and body ground:

  - ABS/TCS HU/CM connector terminal R
  - ABS/TCS HU/CM connector terminal O

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

  - ABS/TCS HU/CM connector terminal R
  - ABS/TCS HU/CM connector terminal O

• Is the voltage B+?
Yes
Repair or replace wiring harness, then go to Step 5.
No | Go to the next step.
4 | CHECK CAN COMMUNICATION LINE FOR OPEN CIRCUIT • Measure continuity between the following terminals (harness-side):

  - ABS/TCS HU/CM connector terminal R and PCM connector terminal 39
  - ABS/TCS HU/CM connector terminal O and PCM connector terminal 13

• Is there continuity?
Yes
Go to next step.
No | Repair or replace wiring harness, then go to next step.
5 | VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from memory. (See Clearing DTCs Procedure) • Is the same DTC present? | Yes | Replace ABS/TCS HU/CM, go to next step.
No | Go to next step.
6 | VERIFY AFTER REPAIR PROCEDURE • Is there any DTC present? | Yes | Go to applicable DTC inspection.
No | Troubleshooting completed.