LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2006 >> Grand Vitara Base, AWD, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs >> Diagnostic Information And Procedures >> DTC U1073: Control Module Communication Bus Off >> DTC Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Troubleshooting

TROUBLESHOOTING CHART

Step Action YES NO
1  Was " ABS CHECK  " performed?  Go to Step 2. Go to ABS CHECK .
2 
  1. Check connection of connectors of all control modules communicating by means of CAN.
  2. Recheck DTC.

Is DTC U1073 indicated? 		 Go to Step 3. Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
3 
  1. Turn ignition switch to OFF position.
  2. Disconnect connectors of all control modules communicating by means of CAN.
  3. Check CAN communication circuit between control modules for open, short and high resistance.

Is each CAN communication circuit in good condition? 		 Go to Step 4. Repair insulation of CAN communication line circuit referring to PRECAUTIONS FOR INSTALLING MOBILE COMMUNICATION EQUIPMENT .
4 
  1. Turn ignition switch to OFF position.
  2. Connect connectors of disconnected control modules communicating by means of CAN.
  3. Disconnect each connector.
    • ECM
    • TCM (for A/T model)
    • BCM
    • 4WD control module (if equipped)
    • Keyless start control module (if equipped)
    • Steering angle sensor (with ESP®)
  4. Recheck DTC.

Is DTC U1073 detected? 		 Check ABS (ESP®) control module power and ground circuit. If circuits are OK, substitute a known-good ABS (ESP®) hydraulic unit/control module assembly and recheck. Check applicable control module power and ground circuit. If circuit is OK, substitute a known-good applicable control module and recheck.
scientia non olet · About LEMON Manuals