Q501 4 Cylinder MT Application DTC Troubleshooting Data Version: 0.1 Date: 21-Sep-2018 Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta Checked By: Yogesh Jadhav Approved By: Satish Kumar P Page: 239 of 1052 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. P0513-86: Incorrect Immobilizer Key: Bad ICU authentication Overview: DTC Description (User Friendly) Incorrect Immobilizer Key: Bad ICU authentication ECU Pin Number - Customer Symptom Vehicle cannot be started. Fault Effects (On Vehicle) Vehicle cannot be started. Lamp Status (If Any) Immobilizer status lamp will come ON. MIL and CEL off. Fault Detection Condition (Root cause) Bad ICU authentication This fault occurs when AES-Key is not programmed correctly in either EMS or VICM ECU Normal Operating Condition Authentication between EMS &Immo is successful. Probable Trouble Area AES key not programmed correctly either in EMS / Immo, ImmoUnit, EMS ECU. Healing Condition After Successful Immo Pairing, In the same Ignition cycle if EMS / Immo hasn’t entered anti scanning mode. After Successful Immo pairing, give a power latch of 20 secs and turn the Ignition ON. Component Details: Immobilizer system is designed to prevent vehicle theft by electronically disabling the engine starting system. The engine can be started only with vehicle’s original immobilizer ignition key, which has an electronic identification programmed code. Immobilizer unit (ICU) is an add-on part on the ignition switch, fitted on the steering column. The engine can be started only with the vehicle’s original immobilizer ignition key. The electronic key communicates the identification code to ICU when the key is turned to the "Ignition ON" position. Engine will allow the Vehicle cranking only if the authentication between EMS and IMMO is successful and Transponder / Key used for cranking is paired to the Immobilizer unit. Preliminary Checks: 1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above Table. If yes, go ahead with next steps. If not, check for other DTC’s presence. 2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with respect to earlier issue closure. 3. Check whether the Immo telltale in the instrument cluster is turned ON. If not, confirm that vehicle starting issue is not related to Immobilizer. 4. Check whether the ignition is turned On with correct transponder key. 5. Read Immo status from the diagnostic tool, Immo status shall be – ‘Authentication between EMS and IMMO failed / Bad authentication’ && Engine starting disabled by EMS. If Immo status is not as above, then vehicle not startingissue is not related to Immobilizer. Trouble Shooting:
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