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: 793 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. P0271-2B:Cylinder 4 Injector Circuit High – Short circuit between high side and low side of the power stage cylinder 4 Overview: DTC Description (User Friendly) Short circuit between high side and low side of the power stage cylinder 4 ECU Pin Number A87, A66 Customer Symptom Torque Limited, Cruise Control Off, MIL ON, Abnormal engine noise Fault Effects (On Vehicle) Reduced torque mode activated, Cruise control off. Abnormal engine noise. Lamp Status (If Any) MIL ON Fault Detection Condition (Root cause) Short Circuit btw EMS ECU pins A87 and A66. Normal Operating Condition From fault, normal operating condition will be achieved in the next driving cycle if fault condition is no more present. Probable Trouble Area Wiring Harness connections between EMS ECU and Injector cylinder 4 Injector Cylinder 4 EMS ECU Healing Condition Rectify the error Clear through diagnostic tool Ignition OFF & ON Component Details: Injector is used for, Metering and spray preparation of the diesel fuel, which is needed by the engine according to the engine map.Realisation of pilot and main injection, also post injection, if needed.Controlling of injected quantity and injection timing, determined by system pressure and energizing time, actuated by the ECU (Electronic Control Unit). 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 the wiring harness connections between EMS ECU and Cylinder 4 Injector as per the circuit Schematic. 4. Loose/ Damaged Connections between Cylinder 4 Injector and EMS ECU. 5. Check for damage of pins at EMS ECU connector and Injector cylinder 4 connector. Trouble Shooting: Step Checks IF YES IF NO 1 Check for any mechanical damage in Cylinder 4 injector Call Hotline Go to next step 2 Is there wiring harness electrical continuity between ECU pin A87 & Cylinder 4 Injector connector pin 2, ECU pin A66 & Cylinder 4 Injector connector pin 1. Go to next step Rectify the wiring harness connections as per the circuit schematic. 3 Check whether the EMS pin A87 is short-circuited to EMS pin A66. Rectify the wiring harness connections Go to next step
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