TATA BSVI Gasoline_Bifuel Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.9 Date: 24-01-2022 Prepared By: Veer K. Singh / Prudhvi B Varma Checked By: Yeshwant Jadhav Approved By: Sanjeev M. Document Part No: 2921 02 xxx xxxx Page: 397 of 1692 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. P0297-22 : Vehicle Overspeed Condition – Signal Amplitude > Maximum Overview: ISO Code P0297-22 Customer Symptom Cluster might display incorrect vehicle speed. Vehicle will be driven in Limp hom3 mode. (engine rpm is limited to 2000 rpm). Fault Effects (On Vehicle) Cluster might display incorrect vehicle speed. Vehicle will be driven in Limp home mode (engine rpm is limited to 2000 rpm). Lamp Status (If Any) MIL Lamp ON after 1 drive cycle Fault Detection Condition This Fault gets logged when the Vehicle Physical speed is more than 180 km/h or ABS / ESP connector is open or incorrect vehicle speed received from IPC. 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, ABS / ESP ECU or WH damage? Healing Condition After fault rectification, lamp will turn OFF after 3 driving cycles 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
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