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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: 370 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.
P0236-85: Turbocharger Boost Sensor “A” Circuit Range/Performance– Signal above Allowable
Range
Overview:
ISO Code
P0236-85
Customer Symptom
Vehicle drivability will be poor
Fault Effects (On Vehicle)
Boost Control strategy will be inactive
Lamp Status (If Any)
MIL ON after 3 driving cycles
Fault Detection Condition
This fault gets logged if EMS detects the Boost pressure is
more than the Boost Pressure required (Limit set by a
calibratable map) for the current engine operating condition.
Normal Operating Condition
Boost pressure is plausible with respect to the Engine
operating condition.
Probable Trouble Area
Wiring Harness Connections, Inlet Air Circuit Clogging,
Sensor faulty, Turbo charger faulty, Waste gate valve Faulty,
Dump valve faulty.
Healing Condition
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:
Boost pressure Sensor consists of a silicon chip mounted inside a reference chamber. On one side of the chip is the
reference chamber and on the other side is the pressure to be measured. The electrical resistance of the chip varies
with the variation of pressure. This change in resistance alters the voltage signal. ECM interprets the voltage signal
as pressure and any change in voltage signal as change in pressure.
Preliminary Checks:
1. Inlet Air Circuit Clogging?
2. Waste gate valve faulty?
3. Turbo charger Faulty?
4. Loose/ Damaged Connections between Sensor and EMS ECU.
5. Check for back out of pins at both Sensor connector and ECU connector.
6. Check for damage of pins at both Sensor connector and ECU connector.