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TATA MOTORS Ltd.
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SRS / Airbag
ECU – DTC Troubleshooting Guide
Version: 14.0
Date: 14-February-2017
Prepared by:Airbag COC Review &
Approved by:Sanjeev VM
Page: 319 of 549
DTC’s confirmation:-
After rectification, ensure the following points using TML diagnostic tool before handing over to customer.
i) Clear the DTC’s & make sure no DTC’s are present for Airbag system
j) Check whether any new DTC’s are getting qualified for repeated cranking.
k) Ensure the Airbag Warning Lamp Indication is continuously ON in Instrument Cluster for
4 seconds
after
Ignition ON
l) Ensure the Airbag Warning Lamp Indication goes OFF after
4 seconds
from Ignition ON.
Circuit Schematic Diagram:-
Schematic shown below for illustration
Battery>>>>>Fuse>>>>Relay>>>>>>>Sensor/Actuator>>>>>ECU
IS DTC
PRESENT?
CLEAR DTC. TURN OFF & ON IGNITION.
AND
CHECK FOR DTC’s (
at least
).
to 3 times
2
IS DTC
STILL
PRESENT
?
1.
READ EXISTING
AIRBAG
ECU
SYSTEM
CONFIGURATION USING
EOL or
SERVICE
TOOL.
2.
VERIFY WHETHER T
HE VEHICLE
IS HAVING
THE CORRECT
AIRBAG ECU SYSTEM
CONFIGURATION AS PER THE
VC?
IS CONFIG.
CORRECT
?
WRITE
THE CORRECT
SYSTEM
CONFIGURATION
IN AIRBAG ECU
USING EOL or
SERVICE TOOL
YES
NO
NO
YES
NO
YES
TURN OFF &
ON THE
IGNITION
&
CHECK FOR
DTC’s
IS DTC
PRESENT?
NO
STOP
RE -CONNECT
THE ECU
& W/H
MODULE IN
THE
VEHICLE
YES
TURN ON IGNITION.
CONNECT THE
DIAGNOSTIC TOOL AND CHECK FOR DTC’s
START
.
B0028-55