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: 469 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. P0327-84: Knock Sensor 1 Circuit Low – Signal Below Allowable Range Overview: ISO Code P0327-84 Customer Symptom Power loss due to Ignition retardation Fault Effects (On Vehicle) 1. No knock control active. 2. Permanent ignition retardation. 3. Engine damage can happen with bad fuel quality. Lamp Status (If Any) CE lamp ON after 5 drive cycles Fault Detection Condition This fault gets logged if open load or Short Circuit to ground with the knock sensor Normal Operating Condition Healthy Wiring Harness connections between Knock Sensor and EMS ecu. Probable Trouble Area Wiring Harness Connections, Knock Sensor Healing Condition Engine Running Condition and after 1 drive Cycle 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: Knock Sensor consists of a piezoelectric element. Piezoelectric elements generate voltage when vibration or pressure is applied to them. The Piezoelectric element in the knock Sensor is tuned to the Engine Knock Frequency. Preliminary Checks: 1) Loose/ Damaged Connections between Sensor and EMS ecu. 2) Check for back out of pins at both Sensor connector and ECU connector. 3) Check for damage of pins at both Sensor connector and ECU connector. 4) Check the continuity from Sensor connector pins to the ECU pins.