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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 83 of 654
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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.
P1237: Turbo charger / Super charger boost sensor A circuit – Calibration Fault Low
Overview:
DTC Description as per ISO Standard
Turbo charger / Super charger boost sensor A circuit
–
Calibration Fault Low
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)
CE Lamp will be ON
Fault Detection Condition
This fault gets logged if the boost pressure signal received is less
than a calibratable threshold
Normal Operating Condition
No faults related to Boost pressure sensor input
Probable Trouble Area
Wiring Harness Connections (Sensor signal pin shorted to GND),
Inlet Air Circuit Clogging, Sensor faulty, Turbo charger faulty, VGT
Actuator / EGR valve faulty, Intercooler pipes damage leading to
charge air leakage.
Healing Condition
After 3 driving cycles
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:
x
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.
x
Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier
issue closure.
x
Inlet Air Circuit Clogging? Rectify / Replace
x
VGT valve faulty? Rectify / Replace
x
Turbo charger Faulty? Rectify / Replace
x
Loose/ Damaged Connections between Boost Pressure Sensor and EMS ECU.
x
Check for back out of pins at both Boost Pressure Sensor connector and ECU connector.
x
Check for damage of pins at both Boost Pressure sensor connector and ECU connector.