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: 37 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. P0531-11: A/C Refrigerant Pressure Sensor "A" Circuit Range/ Performance: Indicates an error when the compressor pressure is not sufficient Overview: DTC Description (User Friendly) A/C Refrigerant Pressure Sensor "A" Circuit Range/ Performance: Indicates an error when the compressor pressure is not sufficient. ECU Pin Number A043 – 5V supply to A/C Refrigerant pressure sensor A044 – Input analog signal to EMS ECU. A048 – Gnd signal to A/C Refrigerant pressure sensor Customer Symptom MIL OFF, CEL OFF Fault Effects (On Vehicle) - Lamp Status (If Any) - Fault Detection Condition (Root cause) Detects an error if the compressor pressure is not enough.The diagnosis is done after a 0 ms time. This allows pressure to build up and avoids false diagnostic fault. Normal Operating Condition Proper Wiring harness connections between EMS and AC pressureSensor. Probable Trouble Area Wiring harness connections between EMS and AC pressure Sensor. AC pipes damaged, AC gas not filled in, EMS ECU. Healing Condition Rectify the error Clear through diagnostic tool. Ignition OFF & ON Component Details: The air conditioning system is pressurized with a gas known as a refrigerant. The refrigerant flows through the lines in the air conditioning system to remove heat and moisture from the interior of your vehicle. It circulates it through the condenser, which disperses the heat into the air. The refrigerant is pressurized in the air conditioning system to operate properly, and it is monitored by the refrigerant pressure sensor. Based on the AC refrigerant pressure, EMS controls the AC Compressor and Cooling Fans. Preliminary Checks: 1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above Table. If yes, go ahead with next steps. If not, check for other DTC’s presence. 2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with respect to earlier issue closure. 3. Check for Damage in EMS ECU connector / A/C Refrigerant pressure sensor. 4. Check for any back out of pins at EMS ECU connector / A/C Refrigerant pressure sensor. 5. Check for any damage of pins at EMS ECU connector / A/C Refrigerant pressure sensor. Trouble Shooting:
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