Q501 4 Cylinder MT Application DTC Troubleshooting Data Version: 0.1 Date: 21-Sep-2018 Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta Checked By: Yogesh Jadhav Approved By: Satish Kumar P Page: 166 of 1052 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. U0439-81: Invalid Data Received From All Terrain Control Module : Fault to be logged for Drive Mode Function when: ModeSelectionSwStateStatusNew ==2 (Implausible) Overview: DTC Description (User Friendly) Invalid Data Received From All Terrain Control Module : Fault to be logged for Drive Mode Function when: ModeSelectionSwStateStatusNew ==2 (Implausible) ECU Pin Number K034 – Input signal to EMS from ECO Mode Switch Customer Symptom Engine will run in default normal / City mode.MIL, CEL OFF Fault Effects (On Vehicle) Engine will run in default normal / City mode. Lamp Status (If Any) - Fault Detection Condition (Root cause) Fault to be logged for Drive Mode Function when: ModeSelectionSwStateStatusNew ==2 (Implausible) Normal Operating Condition Sports Mode and Economy mode functions as per design intention. Probable Trouble Area Wiring harness connections, Sports mode switch, Eco mode switch, EMS ecu. Healing Condition After 3 drive cycles of fault rectification. Component Details: Sports / Economy mode switch is a Normally Open - latchable rotary Switch. Whose electrical contacts will be closed when the rotary Switch is rotated to specific positions. Preliminary Checks: 1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above Table. If yes, go ahead with next steps. If not, check for other DTC’s presence. 2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with respect to earlier issue closure. 3. Check whether the contacts of the Drive mode switch are stuck closed. 4. Check for damage of Drive mode switch connector / EMS ECU connector. 5. Check for damage of Drive Mode switch pins / EMS ECU pins. Trouble Shooting:
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