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: 705 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. Trouble Shooting: Step Checks IF YES IF NO 1 Is there wiring harness electrical continuity between ECU pin 100 & coolant temperature sensor pin 1, ECU pin 99 and Coolant temperature sensor pin 2. Go to next step Rectify the wiring harness connections as per the circuit schematic. 2 Dis-connect the coolant temperature sensor WH connector and check the resistance cross the two pins of temperature sensor at 30 deg C. Is resistance ~= 1680 +/- 60 Ohms. Go to next step Replace the coolant temperature sensor 3 Check whether the ECM pins A100 or A99 are either short circuited to Battery / Ground / Open circuited. Rectify the wiring harness connections s per the schematic Go to Next Step 3 Are there any pins backed out from the Coolant temperature sensor Connector Rectify/Replace Connectors Go to Next Step 4 Are there any pins backed out from the EMS ECU Connector Rectify/Replace Connectors Go to Next Step 5 Fault Persists. Call Hotline Repeat the above steps for reconfirmation DTC’s confirmation: After rectification, Test Drive the vehicle for 2 KM and ensure that no DTC’s are logged in ECM. Circuit Schematic:
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