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: 962 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. P2031-64: Exhaust Gas Temperature Sensor Circuit Bank1 sensor 2 – Oxidation catalyst upstream temperature signal plausibility Overview: DTC Description (User Friendly) Oxidation catalyst upstream temperature signal plausibility ECU Pin Number A056, A055 Customer Symptom MIL ON, CEL OFF. Torque Loss Fault Effects (On Vehicle) Torque Loss, DPF Regen Off. Lamp Status (If Any) MIL ON, CEL OFF Fault Detection Condition (Root cause) The temperature of sensor at Exhaust gas temperature sensor (Inlet catalyst – T4 Sensor) position is compared with all other temperature values (T3, T5, T6 temperature sensor values) and if the value is showing non plausibility with all other sensor. Then the corresponding DTC is Set. Normal Operating Condition No fault Probable Trouble Area Wiring Harness connections between the T4 sensor and EMS ECU Exhaust gas temperature sensor (Inlet catalyst – T4 Sensor) EMS ECU Healing Condition Rectify the error Clear through diagnostic tool Ignition OFF & ON Component Details: The Inlet Cat. sensor is based on a PTC sensitive element, placed inside the sensor body; the resistance decreases/increase as the air temperature increases, according to its specific characteristics. The PTC resistance value, in combination with ECU interface, gives an output voltage proportional to temperature changes. 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 of pins / back out of pins at ECU connector / Exhaust gas temperature sensor (Inlet catalyst – T4 Sensor) connector. If found, rectify. 4. Check the wiring harness connections between the Exhaust gas temperature sensor (Inlet catalyst – T4 Sensor) and EMS ECU. Trouble Shooting: Step Checks IF YES IF NO 1 Check the Electrical Continuity between the Exhaust gas temperature sensor (Inlet catalyst – T4 Sensor) and EMS ECU. For pin details, refer schematic section below. Go to next step Rectify the wiring harness connections as per the circuit
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