Copyright © TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout the consent of author . SRS / Airbag ECU – DTC Troubleshooting Guide Vers ion: 14.0 Da te: 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 H ARNESS 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 T HE 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 B 1 0 1 01 4 :: Crash Output Hardware circuit short to ground or open . I . CHECK THE CONTINUITY OF A5 W.R.T VEHICLE GROUND USING MULTIMETER.
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