TIAGO TIGOR BSVI - SERVICE MANUAL - DTC 24-12-2021

TATA BSVI Gasoline Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.2 Date: 18-12-2019 Prepared By: Sunita Mandlik Checked By: Yeshwant Jadhav Approved By: Satish Kumar Document Part No: 2921 02 xxx xxxx Page: 608 of 1498 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. P0500-84: Vehicle Speed Sensor “A”– Signal Below Allowable Range Overview: ISO Code P0500-84 Customer Symptom Cluster might display incorrect vehicle speed. Driveability will be bad Fault Effects (On Vehicle) Cluster might display incorrect vehicle speed. Driveability will be bad Lamp Status (If Any) CE Lamp ON after 3 drive cycle Fault Detection Condition This Fault gets logged if the Vehicle speed signal sent by Instrument cluster to EMS ecu on CAN is Implausible or not available. Normal Operating Condition Plausible Vehicle speed signal available to EMS Probable Trouble Area CAN bus, Faulty Vehicle speed Sensor, Improper Interface between Instrument Cluster and Vehicle speed Sensor or, Improper Interface between ABS and wheel speed Sensors? Healing Condition Vehicle running and after 1 drive cycle of fault rectification Fault permanent deletion 1. Clear DTC Command form Scan tool 2. Stack Over Flow. 3. 40 warm up cycles. 4.ECU flashing 5. ECU Power-Fail Component Details: A typical Hall Effect Sensor has three wires or terminals: one for ground, one for supply or reference voltage and one for the output signal. To produce an output signal, a Hall Effect Sensor must be supplied with a reference voltage. When a metal/wheel passes through the air gap between the magnetic field (Magnet) and silicon chip, it blocks the magnetic field and causes the chip’s output voltage to suddenly drop to zero else the chip's output voltage is 4.7 Volts. So, it produces a near square wave/ pulses, which will be counted and vehicle speed is calculated. Preliminary Checks: 1. Check whether the CAN Bus is Functional. 2. Check for any Vehicle Speed Sensor related faults in Instrument Cluster ECU or ABS. 3. Check for proper wiring Harness connections between CAN bus and EMS ecu. 4. Check for any pin back out at EMS ecu connector