Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 599 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent Trouble Shooting: Step Checks IF YES IF NO 1. Is there wiring harness electrical continuity between ECU pin A101& high speed Fan relay pin 86. Also Check continuity between the Main Relay supply and the Fan relay Coil pin 85 and Battery Supply to Relay contact pin 30. Go to Step 3 Establish continuity by rectifying harness connections as per the circuit schematic 2. Are there any pins damaged at EMS ECU Connector Replace the connector or wiring harness Go to step 4 3 Are there any pins backed out from the EMS ECU Connector Rectify/Replace Connectors Go to Step 5 4 Is relay getting Supply at its pin 87 Go to Step 6 Repair the harness as per the schematic 5 Is Fan Relay control Pin A101 , Short circuited to GND? Repair the harness as per the schematic Go to Step 7 6 Is fan Properly Working or stalled Rectify / Replace Fan Go to Step 8 7 Fault Still Persists? Replace relay and then if Fault still persists then Call Hot Line Follow the steps again for reconfirmation DTC’s confirmation (checks before handing over vehicle to customer): Perform Actuator test for high speed fan and visually check that fan is operating. When vehicle is soaked for 8 hours and Engine is cranked keeping AC off then Cooling fans will be in Off condition. If any faults present, then rectify the faults. Confirm that there are no faults logged by EMS before handing over the vehicle to customer. Circuit Schematic Diagram:
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