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: 205 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. P0087-92: Positive fuel pressure governor deviation (step 1) low pressure (signal above upper limit) – Performance or Incorrect Operation Overview: DTC Description as per ISO standard Positive fuel pressure governor deviation (step 1) low pressure (signal above upper limit)- Performance or Incorrect Operation ECU Pin Number K071 Customer Symptom MIL ON Fault Effects (On Vehicle) Cruise control off, Torque limitation Regeneration off Lamp Status (If Any) MIL ON Fault Detection Condition (Root cause) Fuel system Normal Operating Condition No Fault Code Probable Trouble Area Fuel system leak Fuel pressure sensor Fuel injectors High pressure delivery pump Fuel system contaminated Healing Condition Clear through diagnostic tool Ignition OFF & ON Component Details: Rail pressure sensor is a piezoelectric type one, which is used to measure the fuel pressure inside the Rail. It provides the Pressure in terms of voltage to the ECU. This rail possesses an under pressure supply of diesel fuel which is ready to be used by the injectors. The drop of pressure in the rail is immediately signalled by the sensor to the engine control unit. This is followed by the restoration of pressure in the pump. It is the engine control unit that controls the fuel supply of the rail from a pump possessing very high pressure. This is done by using a valve for controlling the pressure of fuel Preliminary Checks: 1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If yes, go ahead with next steps. If not, check for other DTC’s presence. 2. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier issue closure. 3. Fuel circuit 4. Loose/ Damaged Connections between fuel pump relay command and EMS ECU. 5. Check for back out of pins at both fuel pump connector and ECU connector. 6. Check for damage of pins at both fuel pump connector and ECU connector. 7. Atmospheric pressure sensor faulty?
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