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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: 329 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.
Is there wiring harness electrical continuity between ECU
pin 79 & Fan relay pin X. Also Check continuity between
the Main Relay supply and the Fan relay Coil pin X and
Battery Supply to Relay contact pin X.
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the circuit
schematic
2. Are there any pins damaged at EMS ecu Connector
Replace the
connector or wiring
harness
Go to step 4
3
Are there any pins backed out from the EMS ecu Connector Rectify / Replace
Connectors
Go to Step 5
4
Is relay getting Supply at its pin XX
Go to Step 6
Repair the harness
as per the
schematic
5
Is Fan Relay control Pin 79, Short circuited to Battery
supply?
Repair the harness
as per the schematic Go to Step 7
6
Is fan Properly Working or stalled
Rectify / Replace
Fan
Go to Step 8
7
Fault Still Persists?
Replace relay and
then if Fault still
persists then Call
Hot Line
Follow the steps
again for
reconfirmation
DTC’s confirmation (checks before handing over vehicle to customer):
x
Perform Actuator test for high speed fan and visually check that fan is operating.
x
When vehicle is soaked for 8 hours and Engine is cranked keeping AC off then Cooling fans will be in Off
condition.
x
If any faults present, then rectify the faults. Confirm that there are no faults logged by EMS before handing over
the vehicle to customer.