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: 938 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. P1000-92: Performance limitation for High Fuel Temperature – Performance limitation for high fuel temperature Overview: DTC Description (User Friendly) Performance limitation for high fuel temperature ECU Pin Number K045, K065 Customer Symptom Torque Restriction Fault Effects (On Vehicle) Reduced torque mode active Lamp Status (If Any) MIL OFF, CEL OFF Fault Detection Condition (Root cause) Fuel Temperature information received from fuel temperature sensor is greater than a threshold Normal Operating Condition No fault. Probable Trouble Area Driving Style Fuel Level WH connections btw fuel temperature sensor and EMS ECU. Fuel temperature Sensor EMS ECU Healing Condition Rectify the error Clear through diagnostic tool Ignition OFF & ON Component Details: Fuel temperature sensor is NTC resistor which resistance varies according to the fuel temperature i.e. the resistance will decrease as the fuel temperature increase. Vehicle's fuel temperature sensor is the component that tells your engine control unit (ECU) to adjust the amount of fuel it injects. When your fuel is warm, it is less dense and it burns more quickly. On the other hand, when fuel is cold fuel, it is denser and burns slower. 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 wiring harness dis-continuities between the fuel temperature sensor and EMS ECU. 4. Poor Driving style leading to fuel temperature rise. Trouble Shooting: Step Checks IF YES IF NO 1. Check the Wiring Harness connections between EMS ECU and fuel temperature sensors as per the schematic. Found ok? Go to next step Rectify the wiring harness connections 2. Observe the driving style of driver. Found abnormal? Ask him to drive normally Go to next step 3 Fault Persists? Replace Fuel Temp. sensor Go to Next step 4 Fault Persists? Call Hotline Repeat the above steps for reconfirmation
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