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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: 48 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.
P0088: Rail pressure found to be more - Over pressure
Overview:
DTC Description as per ISO standard
Fuel Rail/System pressure - Too High.
ECU Pin Number
40
Customer Symptom
Engine noise may be different.
If Engine is running when the Failure is detected, then Engine will stop
Engine will not start.
Fault Effects (On Vehicle)
Combustion noise will be different
If Engine is running when the Failure is detected, then Engine will stop
Engine will not start.
Lamp Status (If Any)
CE lamp is on.
Fault Detection Condition
This DTC gets logged if rail pressure value exceeds Higher threshold value.
Normal Operating Condition
No Faults related to Rail Pressure
Probable Trouble Area
Rail pressure sensor, HP pump, Rail Discharge valve, Injectors, ECU,
Wiring harness
Healing Condition
Clear the errors, Ignition OFF to ON, engine idle, fly-up and specially
vehicle running in different speed condition
Component Details:
Rail pressure sensor is a piezoelectric type one, which is used to measure the fuel pressure inside the Rail. It provides the
pressure in terms of voltage to the ECU. This rail possesses an under pressure supply of diesel fuel which is ready to be
used by the injectors. The drop of pressure in the rail is immediately signaled by the sensor to the engine control unit. This
is followed by the restoration of pressure in the pump. It is the engine control unit that controls the fuel supply of the rail
from a pump possessing very high pressure. This is done by using a valve for controlling the pressure of fuel.
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
Check & ensure IMV connector’s health for proper functionality of IMV
x
Check whether the IMV is stuck open
x
Check the Injectors; ensure Rail valve discharge is happening.
x
Check ECU pins and connector, replace if found defective (Pin Back out, Oxidation of pins & connector damage).
x
Check HP circuit; Refer HP circuit check and rectification procedure.
x
Check LP circuit; Refer LP circuit check and rectification procedure.