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Nexon Gasoline – EMS ECU Bosch
DTC Troubleshooting Manual
Version: 0.1
Date: 26-08-2017
Prepared By: Sunu S Babu/Yogesh Jadhav
Checked By: Yeshwant Jadhav
Approved By: Satish Kumar
Document Part No: 2921 02 224 A1736
Page: 491 of 1203
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.