Introduction - JLR VCI Logger (G4732184)

Activities on the Jaguar Land Rover (JLR) Vehicle Communication Interface (VCI) when connected to a vehicle are logged. These logs can be accessed when problem solving.

The JLR VCI Logger is a vital tool for technicians working on JLR vehicles. Designed to interface directly with the vehicle’s onboard systems, it enables real-time data logging and advanced diagnostics.

If you are diagnosing faults, performing ECU programing, or conducting compliance checks, the JLR VCI Logger provides the visibility and control needed to work efficiently and accurately.

What Is the JLR VCI Logger

The JLR VCI is an SAE J2534-compliant Pass-Thru Interface, officially approved for use with JLR’s diagnostic platforms. It acts as both a data logger and a diagnostic interface, allowing communication between the vehicle’s Electronic Control Unit (ECU)'s and software TOPIx Cloud Diagnostics and SDD.

Compatibility

• TOPIx Cloud Diagnostics - covers Jaguar Land Rover (JLR) vehicles from 17MY for Discovery, Range Rover and Range Rover Sport, and 18MY onwards for all other vehicles excluding XJ
• SDD (Symptom Driven Diagnostics) - for vehicles up to ~2018
• J2534 DLLs - required for integration with SDD
• Universal Serial Bus (USB) connection - with Light Emitting Diode (LED) indicators for power and status
• Protocol support - Controller Area Network (CAN), MultiCAN, ISO9141, DiOP

Note: Standard Corporate Protocol (SCP) is only supported on older models; Diagnostics over Internet Protocol (DoIP) requires the newer DoIP VCI variant

Key Features

• Real-Time Data Capture:
  • Captures live communication between ECU's, including engine, transmission, Anti-Lock Brake System Control Module (ABS), infotainment, and more.
• Time-Stamped Data Capture:
  • Each data packet is logged with a timestamp, helping you pinpoint issues and correlate events precisely.
• Simultaneous Engine Control Module (ECM) / Transmission Control Module (TCM) Data:
  • Supported on most models, though some older vehicles (for example, 2006 Range Rover) may have limitations.
• Offline Analysis:
  • Export the data file for deeper analysis using engineering tools or custom scripts—ideal for fault tracing and ECU behavior validation.
• Predictive Maintenance:
  • Use the data file to detect early signs of failure and prevent breakdowns.
• Compliance and Safety Monitoring:
  • Validate that vehicles meet regulatory standards through detailed system monitoring.

Vehicle Coverage

• Jaguar: Models from 1999 onwards
• Land Rover: Models from 2005 onwards
• Exceptions:
  • Flash programing not supported on XJS and pre-2003 XJ/XK models
  • Limited logging on 2006 Range Rover ECM / TCM signals

Installation and Operation

The JLR VCI Logger is installed through a dedicated executable .exe file. It connects to the vehicle through the OBD connector and interfaces with your machine through the USB port.

Logging is managed through the diagnostic software, where you can configure:

• Channels
• Filters
• Output formats

For setup and guidance, refer to the information in this guide, and the links below:

• Refer to: Vehicle Communication Interface (VCI) requirements
  (TOPIx User Guide/Technical Requirements).
• TOPIx Links Page

Updates and Maintenance

To maintain compatibility with new vehicle models and resolve field issues, the JLR VCI Logger requires periodic driver and firmware updates.