3244 / 4910
X2 Eagle
ESP DTC Troubleshooting Data
Version: 1.0
Date: 23-Oct-15
Author: ERC, Chassis E&E CoC
Page: 211 of 224
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TATA MOTORS Ltd.
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U1621-81:- Invalid data received from Drive Control Switch module
Overview:
ISO Code
U1621-81
Customer Symptom
None
Fault Effects (On Vehicle)
ABS, EBD & ESP – Available
Lamp Status (If Any)
ABS – OFF, EBD – OFF, ESP – OFF
Fault Detection Condition
Incorrect data received from MSS ECU
Normal Operating Condition
MSS ECU sends correct data in normal condition.
Probable Trouble Area
MSS ECU and its interface circuits and sensors
Healing Condition
After rectifying all the functional failures in the MSS 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/ESP in IGN ON condition
Note: After rectification please give Ignition latch to heal the DTC.