X2 Eagle ESP DTC Troubleshooting Data Version: 1.0 Date: 23-Oct-15 Author: ERC, Chassis E&E CoC Page: 211 of 224 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. 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.
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