Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 517 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 P0645-00: A/C Clutch Relay Control Circuit - open circuit Overview: DTC Code P0645-00 DTC Description as per ISO standard A/C Clutch Relay Control Circuit – Open circuit ECU Pin Number B71 Customer Symptom AC Compressor will not be engaged irrespective of AC Request. Fault Effects (On Vehicle) AC Compressor will not be engaged even if AC is requested Lamp Status (If Any) CE lamp is on Fault Detection Condition This fault gets logged if the AC Clutch control pin of EMS ECU is Open circuited. Normal Operating Condition Healthy wiring harness connections between AC Relay and EMS ECU Probable Trouble Area AC Clutch relay Related wiring Harness, connector or terminals ECU Component Details: AC Compressor has a magnetic Clutch Coil of the magnetic clutch is energized by EMS ECU. After getting Energized, Clutch engages the compressor to the EMS ECU. Preliminary Checks: Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If yes, go ahead with next steps. If not, check for other DTC’s presence. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier issue closure. Loose/ Damaged Connections between AC Compressor Relay and EMS ECU. Loose/ Damaged Connections between AC Compressor Relay and Battery supply or Ground. Check for proper installation of AC relay in fuse box. Check for damage of pins at ECU connector.
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