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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: 436 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?
CLEAR DTC
’s . TURN OFF & ON IGNITION
.
CHECK FOR DTC’s (2 t
o 3 times)
IS DTC
STILL
PRESENT
?
1.REPLACE THE
PSP
SENSOR.
2.TURN OFF
& ON THE
IGN
ITION.
3.CLEAR DTC’s
4.CHECK WHETHER THE DTC IS STILL
PRESENT.
IS DTC
PRESENT?
REPLACE
THE
ECU WITH A
NEW ONE
YES
NO
NO
YES
YES
NO
TURN OFF &
ON
IGNITION
.
CLEAR DTC
& CHECK
FOR DTC’s
IS DTC
PRESENT?
NO
STOP
CONNECT THE
ECU
,
PSP
SENSOR
& W/H
MODULE IN
THE
VEHICLE
YES
START
B100D64::
.
TURN ON IGNITION.
CONNECT THE
DIAGNOSTIC TOOL AND CHECK FOR DTC’s