TATA BSVI Gasoline_Bifuel Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 2.6 Date: 5-10-2023 Prepared By: Pradip Shimpi Checked By: Yeshwant Jadhav Approved By: Sanjeev M. Document Part No: 2921 02 xxx xxxx Page: 575 of 1720 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. P0480-13: A/C Fan 1 Control Circuit– Circuit Open Overview: ISO Code P0480-13 Customer Symptom Engine Heat up and seize and damage components. AC will not work Fault Effects (On Vehicle) AC will not work Lamp Status (If Any) Sil Lamp ON after 1 drive cycle Fault Detection Condition This fault gets logged if the A/C Fan Low Speed Relay control pin of EMS ecu is Open Circuited. Normal Operating Condition Healthy Wiring Harness connections between Fan relay and EMS ecu, Relay Fully Operational, Healthy Wiring Harness connections from Relay to Main Relay supply and Ground. Probable Trouble Area Improper Wiring Harness Connections, faulty Relay, Faulty radiator fan Healing Condition Ignition key on and 1 drive cycles after fault rectification Fault permanent deletion 1. Clear DTC Command form Scan tool 2. Stack Over Flow. 3. 40 warm up cycles. 4.ECU flashing 5. ECU Power-Fail Component Details: Radiator fan is driven by EMS ecu via a relay, Radiator Fan will be ON, when the EMS ecu energizes the coil of fan relay. Preliminary Checks: 1) Loose/ Damaged Connections between Fan Relay and EMS ecu. 2) Loose/ Damaged Connections between Fan Relay and Battery supply or Ground. 3) Check for back out of pins at ECU connector. 4) Check for damage of pins at ECU connector. 5) Check the continuity from Relay to the ECU pin and From battery / Main Relay Supply to Fan Relay.
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