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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: 175 of 549
Trouble Shooting:-
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.
TURN ON IGNITION.
CONNECT THE
DIAGNOSTIC TOOL AND CHECK FOR DTC’s
IS DTC
PRESENT?
TURN OFF & ON IGNITION. CLEAR DTC’s
& CHECK FOR DTC’s.
IS DTC
STILL
PRESENT
?
START THE ENGINE & CHECK WHETHER
THE BATTERY VOLTAGEIS
<= 8 V.
IS VOLT
<=
8
V?
CHARGE
THE
BATTERY FOR
SOMETIME
YES
NO
NO
YES
NO
TURN OFF
& ON THE
IGNITION
&
CHECK FOR
DTC’s
IS DTC
STILL
PRESENT?
NO
DISCONNECT
THE AIRBAG
ECU
CONNECTOR
FROM
VEHICLE
W/H. TURN ON IGNITION.
CHECK THE INPUT VOLTAGEOF AIRBAG ECU
W.R.T VEHICLE GROUND IS
<=
8 V.
STOP
RE -CONNECT
THE ECU & W/H
MODULE IN
THE
VEHICLE
YES
REPLACE
AIRBAG
ECU WITH A NEW
ONE
REPLACE RESPECTIVE WIRING
HARNESS
NO
YES
NO
IS VOLT
<=
8
V?
TURN OFF & ON IGNITION. CLEAR DTC’s
& CHECK FOR DTC’s.
IS DTC
STILL
PRESENT?
YES
YES
START
U30061 6::
Control
Module Input
Power "A"
circuit voltage
below
threshold.