PEPS Part Replacement Procedure Title: PEPS System Part Replacement Procedure Spec Num 2921 XX XXX A XXXXTBD Date: 18-Aug-2022 Version: 2.1 Page: 8 of 41 Prepared: Ganesh Girase Checked: Awanish T Approved: Himanshu Saxena This specification is the exclusive property of Tata Motors Limited. Without their consent it may not be reproduced or given to third parties. The above specifications are subject to change and therefore suppliers are requested to refer the latest one. CONTROLLED COPY FOR RESTRICTED CIRCULATION © TATA MOTORS LTD. 2. PEPS ECU Replacement Procedure 2.1. Pre-checks/tasks to be done before replacing the ECU 1) After performing all the necessary checks as per the troubleshooting guide, at wire harness, switches, relays etc., and if no root cause is found, then follow the below procedure. 2) Connect the diagnostic tool to OBD connector. 3) Turn the IGN ON (If the issue itself is with the ignition output, i.e. IGN not turning ON through PEPS ECU, then turn ON the IGN by short linking the IGN relay with battery supply). 4) Perform step 11 to step 29 as mentioned in section 2.2. 5) Check the customer reported fault, whether it is rectified. 6) If the fault is rectified, disconnect the OBD connector and diagnostic tool and remove the short at the IGN relay if made (at step 3 above). If step 5 (above) is NOT OK, i.e. fault is not rectified, follow the replacement procedure given below. Remove the short linking the IGN relay with battery supply if made (at step 3 above). 2.2. ECU replacement procedure Prerequisite: 1) Gateway (Instrument Cluster) shall be functional. 2) Smart keys / UIDs / wearable to be learnt with PEPS shall be available. 3) Latest vehicle configuration/parameter data shall be available on the server. 4) New PEPS ECU shall be available for replacement. NOTES: It is no allowed to take PEPS ECU from another vehicle for replacement. Take a new ECU always. PROCEDURE: 1) Disconnect the battery. 2) Locate the PEPS ECU (Refer Figure 1 for location of the PEPS). 3) Remove all the PEPS ECU connectors (Refer Figure 2 for PEPS connector).
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