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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: 457 of 654
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.
P1622: Non Volatile Memory –
Application Layer
Overview:
DTC Description as per ISO standard
ECU Non-volatile memory fault
ECU Pin Number
ECU internal
Customer Symptom
-
Fault Effects (On Vehicle)
No recovery action.
Lamp Status (If Any)
-
Fault Detection Condition
This DTC gets logged due to Non-volatile memory fault corresponds to
Application layer (APP)
Normal Operating Condition
No NVM faults logged by EMS
Probable Trouble Area
ECU, Grounding points, Wiring harness
Healing Condition
Clear the errors, Ignition OFF to ON, engine idle & fly-up condition
Component Details:
EMS ECU is an electronic controller which controls the Engine functionality by interfacing with various sensors, actuators
and other controllers (via CAN)
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. Check for pin back out at EMS ecu connector or EGR valve connector.
x
Check whether the EMS is receiving Battery supply and Ground
x
Check whether the Battery is healthy
Trouble Shooting:
Step
Checks
IF YES
IF NO
1.
Check whether the EMS ECU is receiving supply and
Ground. Check especially the earthing points whether
they are properly connected after removing body paint.
Any problem found?
Go to step 2
Rectify wiring
harness
connections as
per schematic
2.
Check whether the battery is healthy
Go to step 3
Repair Battery
3
If fault still persists
Replace EMS ECU
Repeat above
procedure for
reconfirmation