3792 / 4910
X2 Eagle
ABS DTC Troubleshooting Data
Version: 1.0
Date: 03-Dec-15
Author: ERC, Chassis E&E CoC
Page: 139 of 154
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TATA MOTORS Ltd.
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U0401-81:- Invalid Data Received From ECM/PCM”A”-Invalid serial data received
Overview:
ISO Code
U0401-81
Customer Symptom
Warning Light Displayed
Fault Effects (On Vehicle)
ABS – Available (W/O Drag Torque Control), EBD – Available
Lamp Status (If Any)
ABS – OFF, EBD – OFF
Fault Detection Condition
Incorrect data received from ECM ECU
Normal Operating Condition
ECM ECU sends correct data in normal condition.
Probable Trouble Area
ECM ECU and its interface circuits and sensors
Healing Condition
After rectifying all the functional failures in the ECM ECU.
Preliminary Check:
1.
Check resistance in Diagnostic CAN pin no. 6 and 14. It should be 120 Ω.
2.
Check for short conditions between CAN_H (pin no. 26)-CAN_L (pin no. 14), CAN_H (pin no. 26)-GND (pin no. 13),
CAN_L (pin no. 14)-GND (pin no. 13), CAN_H (pin no. 26)-Vbatt (pin no. 1) and CAN_L (pin no. 14)-GND (pin no. 13).
There should not be any short circuit conditions.
3.
Check continuity between IPC CAN_H (pin no. 8) vehicle side connector to OBD connector CAN_H (pin no. 6) and
CAN_L (pin no. 7) vehicle side connector to ODB connector (pin no.14)
4.
Read IVN DTCs in ABS in IGN ON condition
Note: After rectification please give Ignition latch to heal the DTC.