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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: 262 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.
TURN ON IGNITION.
CONNECT THE
DIAGNOSTIC TOOL AND CHECK FOR DTC’s
IS DTC
PRESENT?
CLEAR DTC. TURN OFF & ON IGNITION.
CLEAR DTC’s & CHECK FOR DTC’s
.
IS DTC
STILL
PRESENT
?
YES
NO
NO
NO
YES
TURN OFF
& ON THE
IGNITION
&
CHECK FOR
DTC’s
IS DTC
STILL
PRESENT?
NO
STOP
RE-CONNECT
THE ECU,
CRO
HW & WIRING
HARNESS
IN
THE
VEHICLE
NO
YES
1.
TURN OFF IGN,
REMOVE
AIRBAG ECU
CONNECTOR FRO
M VEHICLE W/H.
2.
AND CHECK FOR SHORT, BENT OR CRACK
IN AIRBAG ECU PINS
.
NO
YES
ARE PINS
OK?
REPLACE
AIRBAG ECU
CONNECT THE AIRBAG ECU IN VEHICLE. TURN
ON IGNITION. CLEAR DTC’s & CHECK FOR DTC’s
REPLACE
AIRBAG ECU
WITH A NEW ONE
TURN OFF IGN.
CHECK
THE CONTIN UITY OF WIRING
HARNESS
BETWEEN THE CRO PIN
C176A-5 W.R.T
VEHICLE GROUND
USING MULTIMETER
IS CONTINUITY
PRESENT
?
REPLACE
RESPECTIVE WIRING
HARNESS BETWEEN AIRBAG
ECU & BCM.
IS DTC
STILL
PRESENT?
TURN OFF & ON IGNITION. CLEAR DTC’s
& CHECK FOR
DTC’s.
IS DTC
STILL
PRESENT?
NO
YES
1.
READ EXISTING AIRBAG ECU SYSTEM
CONFIGURATION USING EOL or SERVICE TOOL.
2.
VERIFY WHETHER THE VEHICLE IS HAVING
THE CORRECT AIRBAG ECU SYSTEM
CONFIGURATION AS PER THE VC?
IS CONFIG.
CORRECT
?
WRITE CORRECT SYST
EM
CONFIGURATION IN AIRBAG
ECU USING SERVICE TOOL
YES
YES
YES
NO
START
B101014::
Crash Output
Hardware
circuit short to
groundor
open
.
I . CHECK THE CONTINUITY OF A5 W.R.T
VEHICLE GROUND USING MULTIMETER.