Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 60 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent Checkpoints: Check Battery Voltage at Ignition Off (nominal 11.5V ~ 12.8V) Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check the Battery voltage at Ignition off Nominal range 11.5 – 12.8 V Step 2 Check whether the Crank sensor connector is connected properly. Check if there is any damage in the connector - Step 3 Check whether the ECU connector is connected properly - Step 4 Check for continuity between sensor connector pins 1, 2 and ECU pins A78, A77 respectively. If there is any missing continuity, correct the wiring. Check the End to end continuity using multimeter Step 5 Check for any damage or bend in ECU terminal pin - Step 6 Check the ECU connector for any pin backout - Step 7 Check the crank sensor physically. Replace the sensor, if damaged - Verification condition: Drive the vehicle in city and highway condition Circuit Description: ECM senses the Cam shaft position with the help of Cam Shaft Position Sensor. It is inbuilt in HP Pump. The sensor is Hall Effect type. With the teeth and slot of the intended target wheel the air gap and hence the magnetic field near sensor is altered. The sensor outputs a voltage to ECM of the form shown below. Circuit Schematic Diagram:
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