Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 379 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent Trouble Shooting: Step Checks IF YES IF NO 1 AC pipes got damaged? Causing any leaks of AC refrigerant? Rectify / Replace the Air inlet circuit Go to Step 2 2 AC gas filled in? Go to next step Fill in the AC gas 3 Is there any rust/oxidization observed on Sensor Terminals Clean the Rust or repair or replace Go to next step 4. Is there wiring harness electrical continuity between ECU pins A55, A07, A14 & AC pressure Sensor connector pins 1, 2, 3. Go to Step 5 Establish continuity by rectifying harness connections as per the circuit schematic 5 Are there any pins damaged at Sensor/EMS ECU Connector Replace the connector or wiring harness Go to step 6 6 Are there any pins backed out from the Sensor/EMS ECU Connector Rectify/Replace Connectors Go to Step 7 7 Is Sensor Supply pin A55, Short circuited to GND/Battery. Repair the harness as per the schematic Go to Step 8 8 Is Sensor Signal Pin A07, Short circuited to GND/Battery. Repair the harness as per the schematic Go to Step 9 9 Is sensor physically Damaged Replace Sensor Go to Step 10 10 Fault Still Persists? Call Hotline. Follow the steps again for reconfirmation DTC’s confirmation: After rectification, ensure the following points before handing over to customer. Measure the AC refrigerant pressure, AC refrigerant pressure shall be in the range of 2 to 30 bar. Ensure that no faults are logged in EMS before handing over vehicle back to customer
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