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Q501 4 Cylinder MT Application
DTC Troubleshooting Data
Version: 0.1
Date: 21-Sep-2018
Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta
Checked By: Yogesh Jadhav
Approved By: Satish Kumar P
Page: 484 of 1052
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.
P0238-15: Turbocharger pressure sensor signal (circuit short to battery or open circuit)
Overview:
DTC Description as per ISO standard
Turbocharger pressure sensor signal)plausibility - circuit short
to battery or open circuit
ECU Pin Number
A38,A61,A95,A96
Customer Symptom
MIL ON
Fault Effects (On Vehicle)
Cruise Control shut off;
Torque limitation
Intake manifold pressure to default value
Boost pressure shut off
Regeneration by driver demand inhibition;
Service regeneration inhibition
Regeneration due to flow resistance is disabled;
DPF regeneration interruption or prevention
Lamp Status (If Any)
MIL ON
Fault Detection Condition (Root cause)
Boost pressure sensor wiring harness
Boost pressure sensor
EMS ECU
Normal Operating Condition
No Fault Code
Probable Trouble Area
Boost pressure sensor 5V supply circuit short to supply.
Boost pressure sensor signal short to supply.
Boost pressure ground open circuit.
Boost pressure temperature sensor short to supply
Boost pressure sensor
EMS ECU
Healing Condition
Clear through diagnostic tool
Ignition OFF & ON
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 change in pressure.
Preliminary Checks:
1. 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.
2. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to
earlier issue closure.
3. Inlet Air Circuit Clogging?
4. VGT Actuator faulty?
5. Turbo charger Faulty?
6. Loose/ Damaged Connections between Boost Pressure Sensor and EMS ECU.
7. Check for back out of pins at both Boost Pressure Sensor connector and ECU connector.
8. Check for damage of pins at both Boost Pressure sensor connector and ECU connector.
9. Atmospheric pressure sensor faulty?