Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 535 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent Trouble Shooting: Step Checks IF YES IF NO 1. Check whether the Rotary Drive Mode switch contacts are stuck in closed condition Rectify/Replace the switch Go to next step 2 Check whether the Drive Mode rotary switch is physically damaged Rectify / Replace the Switch Go to next step 3 Check the continuity between the EMS ecu pin 32 and Rotary switch connector pin x. Also check the continuity between EMS ECU pin 68 and rotary switch connector pin X. Go to next step Establish continuity as per the circuit schematic. 5. Check whether the EMS ecu pin B52/B66 is short circuited to Ground. Rectify the wiring harness connections as per the schematic Go to step 6 6. Fault still persists? Replace economy mode switch. IF fault still persists then Call hot line Confirm the above procedure for fault Rectification. DTC’s confirmation: After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before handing over to customer. Turn the Ignition OFF and then turn it ON. Recheck the fault, Fault shall not reappear.
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