Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 536 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent P0633-00: ImmobilizerKey Not Programmed - ECM/PCM Overview: DTC Code P0633-00 DTC Description as per ISO standard Immobilizer Key Not Programmed - ECM/PCM ECU Pin Number - Customer Symptom Vehicle cannot be started. Fault Effects (On Vehicle) Vehicle cannot be started. Lamp Status Immobilizer status lamp will turned ON Fault Detection Condition (Root cause) This fault occurs when pairing process is not performed in vehicle /EMS ECU is fresh & AES-key is not present in EMS. Normal Operating Condition . AES key is written successfully in EMS. Authentication between EMS & Immo is successful Probable Trouble Area Immo pairing not done with EMS ECU. Healing Condition Perform Immo pairing, Turn Ignition Off and 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 Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If yes, go ahead with next steps. If not, check for other DTC’s presence. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier issue closure. Trouble Shooting: Step Checks IF YES IF NO 1. Perform immo pairing. Is immo pairing successful and vehicle got cranked? Confirm that fault is rectified. Call Hot line DTC’s confirmation (checks before handing over vehicle to customer): After the DTC clearing, vehicle should be start & no error in immobilizer. Immo telltale on Instrument cluster shall be off. Circuit Schematic Diagram:
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