1536-1537 / 1904
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.