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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: 167 of 549
DTC’s confirmation:-
After rectification, ensure the following points using TML diagnostic tool before handing over to customer.
a) Clear the DTC’s & make sure no DTC’s are present for Airbag system
b) Check whether any new DTC’s are getting qualified for repeated cranking.
c) Ensure the Airbag Warning Lamp Indication is continuously ON in Instrument Cluster for
4 seconds
after
Ignition ON
d) 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?
TURN OFF & ON IGNITION
. CLEAR DTC
’s &
CHECK FOR DTC’s
(at least
2
to 3 times)
IS DTC
STILL
PRESENT
?
1.
TURN OFF IGNITION.
REP LACEAIRBAG
ECU WITH A NEW ONE.
2.
SEND THE OLD ECU TO THE SUPPLIER
FOR ANALYSIS
THROUGH CUSTOMER
SUPPORT.
YES
NO
NO
YES
TURN OFF &
ON IGNITION
.
CLEAR DTC
’s
& CHECK
FOR DTC’s
IS DTC
STILL
PRESENT?
NO
STOP
YES
RE -CONNECT
THE
AIRBAG
ECU
(NEW
) &
W/H MODULE IN
THE VEHICLE
START
U100643
::
Control Module
Internal
-
special
memory failure.
TURN ON IGNITION.
CONNECT THE
DIAGNOSTIC TOOL AND CHECK FOR DTC’s