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.
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.
• 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.