ERC, Chassis Engineering Prepared by : Sagar K Approved by: Bhavesh Raut Page | 105 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. Nexon MCE ESP DTC Troubleshooting data Document no: X01ME111219 Date: 11-Dec-19 U0155 - 87:- Lost Communication With Instrument Panel Cluster (IPC) Control Module-Bus signal failure Overview: ISO Code U0155-87 Customer Symptom None Fault Effects (On Vehicle) ABS, EBD – Available, ESP, HHC & HDC - Depends on the fault type Lamp Status (If Any) ABS – OFF, EBD – OFF, ESP – ON(Depends on the fault type), HDC&HHC – ON (Depends on the fault type) Fault Detection Condition 1. IPC connector is not connected properly or disconnected from its location. 2. CAN wire from IPC connector side are disconnected 3. IPC IGN & Battery fuse blown. 4. CAN_H, CAN_L or both lines of IPC are open circuit Normal Operating Condition IPC ECU communicates properly with TML diagnostic Tool. Probable Trouble Area 1. IPC connector / IPC fuse. 2. CAN lines of IPC ECU Healing Condition 1. IPC ECU is connected and no wiring harness issues from TCM side 2. CAN_H, CAN_L or/ and both lines of IPC are connected properly Preliminary Check: 1. Check resistance in Diagnostic CAN pin no. 8 and 9. It should be 120 Ω. 5. Check for short conditions between CAN_H (pin no. 14)-CAN_L (pin no.2), CAN_H (pin no. 14)-GND (pin no. 13), CAN_L (pin no. 2)-GND (pin no. 13), CAN_H (pin no. 14)-Vbatt (pin no. 1) and CAN_L (pin no. 2)-GND (pin no.13). There should not be any short circuit conditions. 2. Check continuity between IPC CAN_H (pin no 6) vehicle side connector to ESP CAN_H (pin no. 14) vehicle side connector and IPC CAN_L (pin no 5) vehicle side connector to ESP CAN_L (pin no. 2) vehicle side connector. 3. 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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