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: 796 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. P0335-31: Crank Shaft Position Sensor “A” Circuit – Engine speed sensor general electrical failure Overview: DTC Description (User Friendly) Engine speed sensor general electrical failure ECU Pin Number A020, A021 Customer Symptom Engine possibly will not start, MIL ON Fault Effects (On Vehicle) Engine possibly will not start. Lamp Status (If Any) MIL ON Fault Detection Condition (Root cause) The engine is rotating but there is no crankshaft signal detectable. On the other hand the camshaft signal has been checked and it is plausible. The counter of camshaft rotation without crankshaft signal is checked every 100ms and reaches threshold (Value - 2) Normal Operating Condition No Fault Probable Trouble Area Crank Shaft sensor wiring connections with EMS ECU. Connector of Crank shaft sensor. Crank Shaft Sensor EMS ECU faulty Healing Condition Rectify the error Clear through diagnostic tool Ignition OFF & ON Component Details: This is fitted on the crankcase and faces the phonic wheel on the flywheel. It is inductive type, i.e. its operation is determined by magnetic field changes generated by the teeth passing in front of the phonic wheel. The changeover from full to empty determined by the presence or absence of a gap brings about a magnetic flux change sufficient to generate an induced alternating voltage proportional to the number of teeth on the ring (or phonic wheel). The frequency and amplitude of the voltage send to the electronic control unit provides the latter with an indication of the engine angular speed. The sensor output signal approximates a sine wave whose frequency is proportional to engine speed and amplitude is approximately proportional to engine speed. Active edge is generated from zero crossing point positive to negative transition. 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. Loose/ Damaged Connections between Crank shaft Sensor and EMS ECU. 4. Check for damage / back out of pins at ECU connector. 5. Check for damage / back out of pins at crank shaft sensor’s connector. Trouble Shooting: Step Checks IF YES IF NO 1 Is there wiring harness electrical continuity between ECU pin A020 & Crank Shaft sensor pin 1, ECU pin A021 and Go to next step Rectify the wiring harness
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