Is My 1994 Jeep Grand Cherokee OBD2 Compliant?

The 1994 Jeep Grand Cherokee Obd2 compliance is a common question among owners. While some features might resemble OBD2, it’s generally considered OBD1.5, a transitional phase. To get accurate diagnostics and repairs on your Jeep, you can rely on comprehensive guides and expert assistance from CAR-DIAGNOSTIC-TOOL.EDU.VN. We offer solutions for car diagnostics, repair guides, remote car repair assistance, and technician training to address these challenges.

1. What Does OBD2 Mean for a 1994 Jeep Grand Cherokee?

While the 1994 Jeep Grand Cherokee has some features similar to OBD2, it is not fully OBD2 compliant; instead, it is considered OBD1.5, a transitional phase, because it incorporates elements of both OBD1 and OBD2 systems. According to the EPA, OBD2 was mandated for all cars sold in the US starting in 1996.

1.1 Understanding OBD1.5

OBD1.5 refers to the transitional diagnostic systems used in some vehicles between OBD1 and the fully standardized OBD2. As research from the Society of Automotive Engineers (SAE) indicates, manufacturers like Jeep began incorporating some OBD2 features before the official mandate to prepare for the new standard, resulting in these hybrid systems.

1.2 Key Differences Between OBD1, OBD1.5, and OBD2

Feature	OBD1	OBD1.5 (1994 Jeep Grand Cherokee)	OBD2
Connector Type	Proprietary	Typically 12-pin ALDL (Assembly Line Diagnostic Link)	Standardized 16-pin DLC (Diagnostic Link Connector)
Diagnostic Codes	Manufacturer-specific codes	Combination of manufacturer-specific and some OBD2 codes	Standardized generic codes (P-codes) with manufacturer-specific enhancements
Data Parameters	Limited parameters available	Enhanced parameter availability compared to OBD1	Extensive range of parameters, including live data streams
Accessing Codes	Various methods, often involving counting flashes	Combination of key cycling and scan tools	Standardized scan tools
Compliance Mandate	None	Partial compliance with future OBD2 standards	Mandatory compliance for all vehicles sold in the US after 1996

For instance, while OBD1 might only show a few basic engine parameters, OBD1.5 in the 1994 Jeep Grand Cherokee offers more detailed data but still requires specific diagnostic steps. OBD2 provides a wealth of standardized information accessible through any compliant scan tool, enhancing diagnostic accuracy and ease of use.

1.3 Identifying OBD1.5 in Your Jeep Grand Cherokee

To determine if your 1994 Jeep Grand Cherokee is OBD1.5, check the following:

• Diagnostic Connector Location: Look for the diagnostic port, usually under the dashboard. OBD1.5 connectors may resemble OBD1 but have more pins.
• Service Manuals: Consult the vehicle’s service manual for specific diagnostic procedures.
• Scan Tool Compatibility: Check if standard OBD2 scan tools can retrieve some data, even if not all, from your vehicle.

2. How Can I Diagnose My 1994 Jeep Grand Cherokee OBD System?

Diagnosing the OBD system in your 1994 Jeep Grand Cherokee can be accomplished using a combination of methods, due to its OBD1.5 status. Here’s a detailed guide:

2.1 Using the Key Cycling Method (OBD1)

1. Start with the ignition off: Make sure the engine is not running.

2. Cycle the key: Within five seconds, turn the key from the OFF position to the ON position, then back to OFF, then ON, then OFF, and finally ON. Note that “ON” is not the “Start” position and “OFF” is not the “Lock” position.

3. Watch the “Check Engine” light: The “Check Engine” light will start to flash. Count the flashes to read the codes.

4. Interpreting the Codes:

   • Each code is a two-digit number. For example, a code 23 would be indicated by two flashes, a pause, and then three flashes.
   • A code 55 indicates the end of the codes. This is normal and means the system has finished displaying all stored codes.

5. Record the Codes: Write down each code as it is displayed to reference later.

2.2 Using an OBD1 or OBD2 Scan Tool

1. Acquire a Compatible Scan Tool:

   • OBD1 Scan Tool: Since the 1994 Jeep Grand Cherokee is OBD1.5, an OBD1 scan tool may read some of the codes.
   • OBD2 Scan Tool: Some OBD2 scan tools might be able to retrieve basic diagnostic information.

2. Connect the Scan Tool:

   • Locate the diagnostic port. For the 1994 Jeep Grand Cherokee, it is typically a 12-pin ALDL (Assembly Line Diagnostic Link) connector.
   • Plug the scan tool into the diagnostic port. You may need an adapter if the scan tool does not have the correct connector.

3. Power Up the Scan Tool: Turn the ignition to the “ON” position without starting the engine.

4. Retrieve Diagnostic Codes:

   • Follow the scan tool’s instructions to retrieve stored diagnostic codes. This usually involves selecting the appropriate vehicle make and model.
   • Record all the codes displayed by the scan tool.

5. Interpret the Codes:

   • Refer to a comprehensive list of OBD1 and OBD2 codes to understand what each code means.
   • Be aware that some codes might be manufacturer-specific.

2.3 Additional Tips for Accurate Diagnosis

• Parking Brake: Ensure the parking brake is set, as some models require it to display codes.
• Battery Condition: Make sure the battery is fully charged, as low voltage can cause inaccurate readings.
• Consult Service Manuals: Refer to the vehicle’s service manual for specific diagnostic procedures and code interpretations.
• Verify Codes: Before taking any repair actions, clear the codes and drive the vehicle to see if the codes reappear. This helps ensure the issue is consistent.
• Professional Assistance: If you’re unsure about any part of the diagnostic process, seek help from a professional mechanic.

3. What OBD2 Scan Tools Work with the 1994 Jeep Grand Cherokee?

Given that the 1994 Jeep Grand Cherokee is an OBD1.5 vehicle, selecting the right scan tool can be tricky. Here are some options and considerations:

3.1 OBD1 Scan Tools with Adapters

• Actron CP9145: A popular choice for OBD1 vehicles, it can often read the codes on the 1994 Jeep Grand Cherokee with the appropriate adapter.
• Innova 3145: Another reliable OBD1 scanner that might work with an adapter.
• OTC 3109N: Designed for older vehicles, it may provide more accurate readings than generic OBD2 scanners.

3.2 Hybrid OBD1/OBD2 Scan Tools

• Autel MaxiSys MS906BT: A versatile scan tool that supports both OBD1 and OBD2 protocols, making it suitable for a wide range of vehicles.
• Launch X431 V+: This scan tool is known for its extensive vehicle coverage and ability to perform advanced diagnostics.
• Snap-on MT2500: A professional-grade scan tool that can handle both OBD1 and OBD2 systems.

3.3 Considerations When Choosing a Scan Tool

• Compatibility: Ensure the scan tool supports OBD1 protocol or has adapters for OBD1 connectors.
• Code Definitions: The scan tool should provide clear and accurate code definitions to help you understand the issue.
• Live Data: Check if the scan tool can display live data, which can be useful for diagnosing intermittent problems.
• User Reviews: Read user reviews to see if other owners of 1994 Jeep Grand Cherokees have had success with the scan tool.
• Cost: Balance the cost of the scan tool with its features and compatibility to ensure you’re getting the best value for your needs.

3.4 Steps to Use an OBD2 Scan Tool with an Adapter

1. Purchase the Correct Adapter: Obtain an OBD1 to OBD2 adapter that is compatible with your 12-pin ALDL connector.
2. Connect the Adapter: Plug the OBD1 end of the adapter into the diagnostic port of your 1994 Jeep Grand Cherokee.
3. Connect the Scan Tool: Plug the OBD2 end of the adapter into your OBD2 scan tool.
4. Power On: Turn the ignition to the “ON” position without starting the engine.
5. Follow Scan Tool Instructions: Follow the instructions on your OBD2 scan tool to read the diagnostic codes. You may need to manually select the vehicle type or use a generic OBD2 setting.
6. Record and Interpret Codes: Write down any codes that appear and refer to a code list for interpretation. Remember that some codes may be manufacturer-specific.

4. What Are the Common OBD Codes for the 1994 Jeep Grand Cherokee?

Understanding common OBD codes can help you diagnose issues more efficiently. Here are some frequent codes for the 1994 Jeep Grand Cherokee:

4.1 Engine-Related Codes

• Code 11: No ignition reference signal detected during cranking, OR timing belt skipped one or more teeth, OR loss of either camshaft or crankshaft position sensor.
• Code 12: Battery or computer recently disconnected.
• Code 13: MAP sensor or vacuum line may not be working.
• Code 14: MAP sensor voltage below 0.16V or over 4.96V.
• Code 21: Oxygen sensor signal doesn’t change (stays at 4.3-4.5V).
• Code 22: Coolant sensor signal out of range.
• Code 23: Incoming air temperature sensor may be bad.
• Code 24: Throttle position sensor over 4.96V.
• Code 41: Alternator field control circuit open or shorted.
• Code 42: Automatic shutdown relay circuit open or shorted, OR Fuel pump relay control circuit, OR Fuel level unit – no change over miles, OR Z1 voltage missing when auto shutdown circuit energized.
• Code 43: Peak primary coil current not achieved with max dwell time, OR Cylinder misfire, OR Problem in power module to logic module interface.
• Code 51: Oxygen sensor stuck at lean position.
• Code 52: Oxygen sensor stuck at rich position.

4.2 Transmission-Related Codes

• Code 37: Shift indicator light failure, 5-speed OR part throttle lock/unlock solenoid driver circuit OR solenoid coil circuit OR Trans temperature sensor voltage low (1995 and on).

4.3 Air Conditioning Codes

• Code 33: Air conditioning clutch relay circuit open or shorted.

4.4 Other Common Codes

• Code 15: No speed/distance sensor signal.
• Code 16: Loss of battery voltage detected with engine running.
• Code 17: Engine stays cool too long (bad thermostat or coolant sensor).
• Code 25: Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached.
• Code 26: Peak injector circuit voltage has not been reached.
• Code 27: Injector circuit isn’t switching when it’s told to.
• Code 31: Bad evaporator purge solenoid circuit or driver.
• Code 32: EGR gases not working.
• Code 34: EGR solenoid circuit shorted or open OR speed control shorted or open.
• Code 35: Cooling fan relay circuit open or shorted OR idle switch motor fault.
• Code 36: Wastegate control circuit open or shorted (turbo only).
• Code 44: No FJ2 voltage present at logic board OR Logic module self-diagnostics indicate problem OR Battery temperature out of range.
• Code 45: Turbo boost limit exceeded (engine was shut down by logic module).
• Code 46: Battery voltage too high during charging or charging system voltage too low.
• Code 47: Battery voltage too low and alternator output too low.
• Code 53: Logic module internal problem.
• Code 54: No sync pickup signal during engine rotation (turbo only).
• Code 55: End of codes.
• Code 61: “Baro” sensor open or shorted.
• Code 62: EMR mileage cannot be stored in EEPROM OR PCM failure SRI mile not stored.
• Code 63: Controller cannot write to EEPROM.
• Code 64: Catalytic converter efficiency failure.
• Code 65: Power steering switch failure.
• Code 66: No CCD Message From TCM and/or No CCD Message From BCM.

4.5 Resources for Code Definitions

• Online Databases: Websites like OBD-Codes.com and AllData provide extensive code definitions.
• Service Manuals: Your vehicle’s service manual contains detailed information about OBD codes and diagnostic procedures.
• Forums: Jeep forums can offer insights from other owners who have encountered similar issues.

By familiarizing yourself with these common codes and using the appropriate diagnostic tools, you can effectively troubleshoot and resolve many issues with your 1994 Jeep Grand Cherokee.

5. How to Interpret OBD Codes for a 1994 Jeep Grand Cherokee?

Interpreting OBD codes for a 1994 Jeep Grand Cherokee requires understanding the nuances of its OBD1.5 system. Here’s a step-by-step guide:

5.1 Retrieve the Codes

Use the key cycling method or a compatible scan tool to retrieve the diagnostic codes from your Jeep.

5.2 Identify the Code Type

Determine whether the code is a standard OBD code or a manufacturer-specific code. The 1994 Jeep Grand Cherokee, being an OBD1.5 vehicle, may display both types of codes.

5.3 Use a Code Reader or Manual

Consult a reliable code reader or your vehicle’s service manual to look up the code. These resources provide descriptions of what each code means.

5.4 Understand the Code Description

The code description will give you an overview of the problem area. For example:

• Code 12 (Battery or computer recently disconnected): This indicates that the vehicle’s battery has been disconnected recently, which can trigger this code.
• Code 21 (Oxygen sensor signal doesn’t change): This suggests an issue with the oxygen sensor, such as a faulty sensor or wiring problem.
• Code 41 (Alternator field control circuit open or shorted): This indicates a problem with the alternator’s control circuit, which could affect charging performance.

5.5 Gather Additional Information

Collect additional information about the symptoms your vehicle is exhibiting. This can help narrow down the possible causes of the code.

5.6 Check Related Components

Once you have a general idea of the problem area, inspect related components to identify potential issues.

5.7 Test the Components

Use a multimeter or other diagnostic tools to test the components identified in the previous step. Compare your measurements to the specifications in your vehicle’s service manual.

5.8 Verify the Fix

After making repairs, clear the OBD codes and take your vehicle for a test drive. Monitor the system to ensure the code does not reappear.

6. Where Can I Find a 1994 Jeep Grand Cherokee OBD2 Wiring Diagram?

Finding the correct wiring diagram is essential for diagnosing electrical issues.

6.1 Online Resources

• Factory Service Manuals: The best resource is the factory service manual specific to the 1994 Jeep Grand Cherokee.
• Subscription Services: Websites like Alldata and Mitchell OnDemand offer detailed wiring diagrams and repair information for a subscription fee.
• Online Forums: Jeep-specific forums often have members who share wiring diagrams and other technical information.

6.2 Libraries

Your local library may have automotive repair manuals that include wiring diagrams. Check the reference section for Chilton or Haynes manuals.

6.3 Professional Mechanics

If you’re having trouble locating a wiring diagram, consider consulting a professional mechanic.

6.4 Key Components of the Wiring Diagram

• Connectors: Identify the diagnostic connector’s location and pinout. The 1994 Jeep Grand Cherokee might use a unique connector due to its OBD1.5 status.
• Sensors: Locate the wiring for key sensors like the oxygen sensor, MAP sensor, and coolant temperature sensor.
• ECU (Engine Control Unit): Trace the wiring from the diagnostic connector to the ECU to understand the data flow.
• Grounding Points: Ensure all grounding points are clean and secure to avoid electrical issues.

7. What Are Some Common Diagnostic Trouble Codes (DTCs) for 1994 Jeep Grand Cherokee?

7.1 Code 11 – No Ignition Reference Signal During Cranking

• Description: The Engine Control Unit (ECU) isn’t receiving a clear signal indicating the engine’s rotation during startup.
• Symptoms: The engine might crank but fail to start, or it could start sporadically.
• Possible Causes: A faulty crankshaft position sensor or camshaft position sensor. Damaged wiring or connections to these sensors. Timing belt or chain issues.

7.2 Code 12 – Battery or Computer Recently Disconnected

• Description: The ECU’s memory has been cleared due to a recent disconnection of the battery or the ECU itself.
• Symptoms: The “Check Engine” light might illuminate. Engine performance might be temporarily affected as the ECU relearns optimal settings.
• Possible Causes: Recent battery replacement or disconnection. Resetting the ECU by disconnecting it.

7.3 Code 13 – MAP Sensor or Vacuum Line May Not Be Working

• Description: The Manifold Absolute Pressure (MAP) sensor isn’t providing accurate data to the ECU.
• Symptoms: Rough idling, poor fuel economy, hesitation during acceleration, or stalling.
• Possible Causes: A faulty MAP sensor. Vacuum leaks in the lines connected to the MAP sensor. Wiring issues affecting the sensor’s signal.

7.4 Code 14 – MAP Sensor Voltage Below 0.16V or Over 4.96V

• Description: The voltage signal from the MAP sensor is outside the normal operating range.
• Symptoms: The engine might run rich or lean. Poor engine performance.
• Possible Causes: Shorted or open wiring to the MAP sensor. A defective MAP sensor. ECU issues.

7.5 Code 21 – Oxygen Sensor Signal Doesn’t Change

• Description: The oxygen sensor isn’t detecting changes in the exhaust gas composition, indicating a potential issue.
• Symptoms: Poor fuel economy, elevated emissions, and potential catalytic converter damage.
• Possible Causes: A failing or contaminated oxygen sensor. Exhaust leaks near the sensor. Wiring problems.

7.6 Code 22 – Coolant Sensor Signal Out of Range

• Description: The signal from the coolant temperature sensor is either too high or too low.
• Symptoms: Difficulty starting the engine, poor engine performance, and overheating.
• Possible Causes: A faulty coolant temperature sensor. Wiring problems to the sensor. A malfunctioning thermostat.

7.7 Code 23 – Incoming Air Temperature Sensor May Be Bad

• Description: The Intake Air Temperature (IAT) sensor might be providing inaccurate readings.
• Symptoms: Poor fuel economy, hesitation during acceleration, and rough idling.
• Possible Causes: A defective IAT sensor. Wiring issues.

7.8 Code 24 – Throttle Position Sensor Over 4.96V

• Description: The Throttle Position Sensor (TPS) is reporting a voltage higher than the expected maximum.
• Symptoms: Erratic idling, hesitation, and potential stalling.
• Possible Causes: A faulty TPS. Shorted wiring.

7.9 Code 33 – Air Conditioning Clutch Relay Circuit Open or Shorted

• Description: There is an issue with the electrical circuit controlling the air conditioning clutch relay.
• Symptoms: The air conditioning system might not engage or disengage properly.
• Possible Causes: A faulty relay. Open or shorted wiring. A defective A/C compressor clutch.

7.10 Code 41 – Alternator Field Control Circuit Open or Shorted

• Description: The alternator’s field control circuit is experiencing an open or short, affecting the charging system.
• Symptoms: The battery might not charge properly. The vehicle might experience electrical issues.
• Possible Causes: A faulty alternator. Wiring problems. A defective voltage regulator.

7.11 Code 42 – Automatic Shutdown Relay Circuit Open or Shorted

• Description: The automatic shutdown (ASD) relay circuit has an open or short.
• Symptoms: The engine might stall or fail to start.
• Possible Causes: A faulty ASD relay. Wiring issues. A defective ECU.

8. Where Can I Find Reliable Repair Guides for My 1994 Jeep Grand Cherokee?

8.1 Factory Service Manuals

• Source: These manuals, published by the vehicle manufacturer, provide the most accurate and detailed information for your specific vehicle.
• Content: Includes comprehensive repair procedures, wiring diagrams, diagnostic charts, and component specifications.
• Availability: Often available in print or digital format through online retailers or specialized automotive manual suppliers.

8.2 Aftermarket Repair Manuals

• Haynes and Chilton Manuals: Widely available manuals that cover a broad range of repair and maintenance tasks.
• Content: Step-by-step instructions, photos, and illustrations to guide you through various repairs.
• Availability: Available at most auto parts stores, online retailers, and libraries.

8.3 Online Repair Databases

• ALLDATA and Mitchell 1 DIY: Subscription-based services that provide access to a vast database of repair information.
• Content: Includes OEM repair procedures, technical service bulletins (TSBs), wiring diagrams, and diagnostic information.
• Availability: Accessible online with a paid subscription, offering up-to-date and vehicle-specific information.

8.4 Online Forums and Communities

• Jeep Forums and Enthusiast Websites: Online communities where Jeep owners and enthusiasts share their knowledge and experiences.
• Content: Repair tips, troubleshooting advice, modifications, and access to shared resources.
• Availability: Free access to forums where you can ask questions, search for information, and connect with other Jeep owners.

8.5 Video Tutorials

• YouTube Channels and Online Video Platforms: Numerous channels offer video tutorials on automotive repair and maintenance.
• Content: Visual guides to performing specific repairs, troubleshooting common issues, and understanding vehicle systems.
• Availability: Free access to a wide variety of video tutorials that can help you visualize repair processes.

8.6 Local Libraries

• Automotive Repair Sections: Many public libraries have automotive repair manuals available for reference.
• Content: Access to Haynes, Chilton, and other repair manuals that cover a range of vehicles and repair topics.
• Availability: Free access to repair manuals during library hours, providing a convenient resource for DIY repairs.

9. What Kind of Remote Support is Available for 1994 Jeep Grand Cherokee Diagnostics?

While remote support options can be limited for older vehicles like the 1994 Jeep Grand Cherokee, here are some avenues to explore:

9.1 Online Forums and Communities

• Platform: Jeep-specific forums, such as JeepForum.com and CherokeeForum.com, are valuable resources.
• Support: Experienced Jeep owners and mechanics offer troubleshooting advice, diagnostic tips, and repair guidance.
• Benefits: Free access, a wide knowledge base, and real-time interaction with other enthusiasts.

9.2 Professional Mechanic Consultation

• Platform: Services like JustAnswer allow you to connect with certified mechanics online.
• Support: Mechanics provide remote diagnostic assistance, code interpretation, and repair recommendations for a fee.
• Benefits: Access to professional expertise without visiting a physical shop.

9.3 Video Conferencing with Mechanics

• Platform: Some independent mechanics and repair shops offer remote diagnostic services via video conferencing tools like Zoom or Skype.
• Support: Mechanics visually inspect your vehicle, guide you through diagnostic steps, and provide real-time repair advice.
• Benefits: Personalized support, visual guidance, and the ability to address specific issues.

9.4 Scan Tool Data Sharing

• Platform: Advanced scan tools, such as those from Autel or Snap-on, allow you to share diagnostic data with remote technicians.
• Support: Technicians analyze the data, provide diagnostic insights, and offer repair recommendations.
• Benefits: Expert analysis of complex diagnostic information, leading to accurate repairs.

9.5 Remote Tuning and Diagnostics

• Platform: Specialized tuning shops offer remote diagnostic and tuning services for older vehicles.
• Support: Technicians remotely access your vehicle’s computer, diagnose issues, and optimize performance.
• Benefits: Enhanced performance, customized tuning, and remote diagnostic capabilities.

10. Are There Any Training Courses Available for Working on 1994 Jeep Grand Cherokees?

While there may not be specific training courses dedicated solely to the 1994 Jeep Grand Cherokee, several options can provide you with the necessary skills and knowledge:

10.1 Automotive Technology Programs at Community Colleges

• Curriculum: These programs cover a broad range of automotive topics, including engine repair, electrical systems, diagnostics, and maintenance.
• Relevance: While not specific to the 1994 Jeep Grand Cherokee, the fundamental knowledge and skills learned can be applied to any vehicle.
• Benefits: Hands-on training, industry-recognized certifications, and a strong foundation for a career in automotive technology.

10.2 Online Automotive Training Courses

• Platforms: Websites like Udemy, Coursera, and Skillshare offer a variety of automotive training courses.
• Curriculum: Courses range from basic automotive maintenance to advanced diagnostics and repair techniques.
• Relevance: You can find courses that cover specific systems relevant to the 1994 Jeep Grand Cherokee, such as fuel injection, ignition systems, and OBD1 diagnostics.
• Benefits: Flexible learning schedule, affordable pricing, and the ability to learn at your own pace.

10.3 Manufacturer-Specific Training Programs

• Mopar Technical Training: Chrysler (now Stellantis) offers training programs for technicians working on their vehicles, including Jeeps.
• Curriculum: These programs cover a wide range of topics, including diagnostics, repair procedures, and new technology updates.
• Relevance: While specific to Chrysler vehicles, the training can provide valuable insights into the systems used in the 1994 Jeep Grand Cherokee.
• Benefits: In-depth knowledge of Chrysler vehicles, hands-on training, and access to manufacturer-specific tools and resources.

10.4 Automotive Trade Schools

• Curriculum: These schools offer comprehensive training programs in automotive technology, with a focus on hands-on skills.
• Relevance: The broad curriculum covers various automotive systems, providing a solid foundation for working on any vehicle.
• Benefits: Intensive training, industry-recognized certifications, and career placement assistance.

10.5 Local Vocational Schools

• Curriculum: Vocational schools often offer automotive repair courses that cover basic maintenance and repair skills.
• Relevance: These courses can provide a good starting point for learning about automotive technology and working on the 1994 Jeep Grand Cherokee.
• Benefits: Affordable tuition, hands-on training, and a focus on practical skills.

10.6 Community Workshops and Seminars

• Offerings: Local community centers, auto parts stores, and car clubs may offer workshops and seminars on basic automotive maintenance and repair.
• Relevance: These workshops can provide valuable hands-on experience and practical tips for working on your own vehicle.
• Benefits: Affordable, hands-on learning, and the opportunity to connect with other car enthusiasts.

By combining these resources with hands-on experience, you can develop the skills and knowledge needed to confidently work on your 1994 Jeep Grand Cherokee and keep it running smoothly for years to come.

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