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: 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 . CL EAR DTC & CHECK FOR DTC’s IS DTC PRESENT? NO STOP CONNECT THE ECU , PSP SENSOR & W/H MODULE IN THE VEHICLE YES START B 1 0 0 D 6 4 :: . TURN ON IGNITION. CONNECT THE DIAGNOSTIC TOOL AND CHECK FOR DTC’s
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