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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 n
ew 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