9. ENGINE MANAGEMENT SYSTEM A. ABBREVIATIONS CAN Control Area Network GND Ground V batt Battery IPC Instrument Panel Cluster IGN Ignition DTC Diagnostic Troubleshooting Code OBD On Board Diagnostic HVAC Heating Ventilation Air Conditioning ECU Electronic Control Unit TML Tata Motors Ltd. HU Head Unit TCM Transmission Control Module ECM Engine Control Module MTO Message Time Out CRC Cyclic Redundancy Check MRC Message Rolling Counter Diesel Engine Ph-2 (CAFÉ) 189
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