NEXON DIAGNOSTIC MANUAL

OSPREY- Application

DTC Troubleshooting Data

Version: 4.0

Date: 10-02-2017

Prepared by: Mithipati Prasad

Checked by: G S Raju / Senthilnathan S

Page: 76 of 654

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.

P1235: Turbo charger / Super charger boost sensor A circuit – Supply fault

Overview:

DTC Description as per ISO Standard

Turbo charger / Super charger boost sensor A circuit

–

Supply fault

Customer Symptom

Engine restricted performance

Probable Black Smoke

Fault Effects (On Vehicle)

Reduced torque mode will be activated

Speed Pilot control (Dynamic Injector learning) gets disabled

VGT actuator control will be disabled.

Disables EGR by setting desired rate to 0. This will affect

EGRH rate, EGRL rate, IFLAP, Throttle, Intake manifold

pressure and boost pressure.

Lamp Status (If Any)

MI Lamp will be ON

Fault Detection Condition

This fault gets logged if the Boost Pressure Sensor supply

(ECU internal power supply) internal failure or Externally

supply pin is shorted to GND or Battery. This fault will also get

logged if the ADC (Analog to Digital Converter) fails.

Normal Operating Condition

No Boost pressure sensor supply / ADC related failures.

Probable Trouble Area

Wiring Harness Connections, Sensor, ECU.

Healing Condition

TBD

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:

Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If

yes, go ahead

with next steps. If not, check for other DTC’s presence.

Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier

issue closure.

Loose/ Damaged Connections between Sensor and EMS ECU.

Check for back out of pins at both Sensor connector and ECU connector.

Check for damage of pins at both sensor connector and ECU connector.