NANO

ELECTRICAL 35 Sr No DTC Code DTC Descriptio n Minimum Time for Fault Setting / Tester Visibility, Assuming Fault was created while Ignition was OFF Impact on customer Probable cause Investigation/Rectificati on/Repair action 3 U0401 81 Invalid Data Received From ECM/PCM - invalid serial data received 1.5 to 1.75s Engine Coolant temp lamp ON, No Indication on Temp bar graph display, AFE screen display will be --.--, Current gear display will be ‘F’. One or more signals received from ECM is invalid. 1. Check functional DTCs present in ECM ECU. 2. Follow the procedure to repair all the functional DTCs present in ECM ECU. 4 U0402 81 Invalid Data Received From TCM - invalid serial data received 1.5 to 1.75s Current gear display will be ‘F’ TCM Lamp ON One or more signals received from TCM is invalid. 1. Check functional DTCs present in TCM ECU. 2. Follow the procedure to repair all the functional DTCs present in TCM ECU. 5 U0100 08 Lost Communic ation With ECM/PCM "A" - Bus Signal / Message Failures 1 to 1.25s CE Lamp ON,MIL Lamp ON.EMS will go into default mode 1. ECM ECU is connected properly in the vehicle. 2. ECM ECU battery/Ignition fuse is not connected properly in Engine Fuse Relay Box (EFRB) 3. Improper/ No Grounding. 4. Permanent open circuit failure in CAN High line of ECM stub (or connector) in wiring harness. 5. Permanent open circuit failure in CAN Low line of ECM stub (or connector) in wiring harness. 6. ECM ECU CAN High or Low line terminal back out at ECM wiring harness connector. 1. Check if ECM ECU is connected properly in the vehicle. 2. Check if ECM ECU Ignition/Battery fuse is connected properly in Engine Fuse Relay Box (EFRB), if fuse not present or blown connect/replace the fuse. 3. Check for ground line connected properly. 4. Check if ECM ECU CAN lines are connected properly in vehicle. 5. Repair the wiring harness.