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: 58 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. P2229-17: Atmospheric air pressure sensor (circuit voltage above threshold) Overview: DTC Description as per ISO standard Atmospheric air pressure sensor - circuit voltage above threshold ECU Pin Number ECU intetrnal Customer Symptom MIL ON Fault Effects (On Vehicle) 1. Torque limitation. 2. Regeneration off 3. DPF lamp On in instrument cluster. Lamp Status (If Any) MIL ON, DPF lamp ON Fault Detection Condition (Root cause) Ignition ON and Engine On. Normal Operating Condition No Fault Code Probable Trouble Area 1. Run the diagnostic procedures to check the EMS & ground. 2. Check the integrity of the pins of the EMS, if the fault still occurs, replace the EMS. Healing Condition Clear through diagnostic tool Ignition OFF & ON Component Details: Atmospheric Pressure Sensor is mounted on EMS ECU; it gives the Atmospheric Pressure signal to ECU internally. No separate hardware pins assigned to Atmospheric Pressure signal in wiring harness. EMS uses the atmospheric pressure information for correction of air fuel ratio at higher altitudes. Preliminary Checks: 1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. 2. If yes, go ahead with next steps. If not, check for other DTC’s presence. 3. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to Earlier issue closure. Check whether the EMS ECU is getting power supply and GND. Rectify wiring Harness as per the schematic if found faulty. 4. Check whether the Main relay is faulty. Rectify/Replace if found main relay is faulty. 5. If fault still persists then Call Hot Line
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