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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: 460 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.
Trouble Shooting:
Step Checks
IF YES
IF NO
1.
Are Relay Contacts weld / Stuck Open
Replace the Relay
Go to Step 2
2.
Is there wiring harness electrical continuity between ECU
pin 48 & AC relay pin
3
. Also Check continuity between the
Main Relay supply and the AC relay pin
1
. Also check
continuity from AC Relay pin
1
to GND.
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the circuit
schematic
3. Are there any pins damaged at EMS ECU Connector
Replace the
connector or wiring
harness
Go to step 4
4
Are there any pins backed out from the EMS ECU
Connector
Rectify/Replace
Connectors
Go to Step 5
5
Is relay getting Supply at its pin
3
Go to Step 6
Repair the harness
as per the
schematic
6
Is AC Relay control Pin 48, Open circuited?
Repair the harness
as per the schematic Go to Step 7
7
Is AC Compressor Working or stalled
Rectify / Replace AC
Compressor
Go to Step 8
8
Fault Still Persists?
Replace relay and
then if Fault still
persists then Call
Hot Line
Follow the steps
again for
reconfirmation
DTC’s confirmation:
After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before handing
over to customer.
x
Perform Actuator test of AC Relay. Test should be successful.
x
Turn Off the AC request, AC Compressor shall be disengaged / Off.
x
Turn ON the AC request, AC Compressor shall get engaged.