Bobcat 773 Keyless Ignition Problems: Troubleshooting and Solutions

[MikePhua]

Bobcat 773 is a popular skid-steer loader known for its reliability, compact design, and ease of use. However, like many complex machines, it can sometimes encounter issues with its keyless ignition system. This article will explore the causes behind keyless ignition problems in the Bobcat 773, common symptoms, and provide a thorough troubleshooting guide, including solutions to get your machine back in operation.
What is Keyless Ignition in the Bobcat 773?
Keyless ignition systems are becoming increasingly common in modern heavy equipment for added security and convenience. These systems allow operators to start and stop the engine without the use of a traditional mechanical key. Instead, they rely on electronic fobs or codes that interact with an on-board computer system.
In the Bobcat 773, the keyless ignition system provides several advantages, including reduced risk of theft, easier start-up, and more efficient operation for the user. However, when problems arise with this system, it can halt productivity and cause frustrating downtime. Keyless ignition systems typically function using a transponder or code reader, which communicates with the machine’s main control unit to allow the engine to start.
Common Symptoms of Keyless Ignition Issues
The Bobcat 773’s keyless ignition system may experience various problems, some of which can be traced to electrical components, wiring issues, or faulty transponder systems. Common symptoms that suggest a keyless ignition issue include:

1. Machine Won’t Start: One of the most common signs of a keyless ignition problem is when the Bobcat 773 will not start, even when the ignition fob is used correctly.
   
2. Intermittent Starting Issues: The machine may start on occasion but fail to start consistently. This could be related to a faulty transponder chip or weak electrical connections.
   
3. Error Code Display: If the system fails to recognize the fob or key, an error code might appear on the machine’s display. This often points to issues with the communication between the fob and the machine’s computer.
   
4. No Power to Electrical Systems: If the machine shows no signs of power when attempting to start, it could indicate a keyless ignition failure or a wiring issue within the electrical system.
   
5. Battery Drain: A keyless ignition problem can sometimes drain the battery faster than usual, especially if the system is malfunctioning and trying to communicate with a non-responsive fob.
   

Causes of Keyless Ignition Problems
Several factors could contribute to problems with the keyless ignition system in the Bobcat 773. Some of the common causes include:

1. Dead or Weak Transponder Battery: The fob or transponder used to communicate with the ignition system may have a dead or weak battery, preventing the proper signal from being sent to the machine.
   
2. Faulty Transponder or Fob: A malfunctioning transponder chip or fob may not send the proper signal to the computer, which is needed to unlock the ignition system and allow the engine to start.
   
3. Corroded or Loose Wiring: Over time, wiring connections can corrode or loosen, leading to intermittent signals between the fob and the ignition system. Poor wiring can also disrupt the flow of power to critical components.
   
4. ECM (Electronic Control Module) Failure: The ECM, which acts as the brain of the machine’s electrical systems, can fail or malfunction, causing the keyless ignition system to become unresponsive.
   
5. Faulty Ignition Switch: In some cases, the ignition switch itself may fail, preventing the system from registering that the machine is in the “on” position. This issue can also be linked to internal faults within the ignition module.
   
6. Interference or Damage to the Keyless System: External interference, such as radio frequency disruptions, or physical damage to the keyless ignition system could prevent the machine from starting.
   
7. Software Glitch: Sometimes, issues with the machine's software may cause the keyless ignition system to fail. This could be due to an outdated system, corrupt files, or bugs in the software that controls the ignition.
   

Troubleshooting Keyless Ignition Problems
If your Bobcat 773 is experiencing keyless ignition issues, here are some troubleshooting steps to help identify and resolve the problem:

1. Check the Fob Battery:
   The first step in troubleshooting a keyless ignition issue is to check the battery in the ignition fob. If the fob battery is weak or dead, replace it with a new one and try starting the machine again.
   
2. Inspect Electrical Connections:
   Inspect all wiring and electrical connections, particularly those related to the keyless ignition system. Look for signs of wear, corrosion, or loose connectors that could interfere with the signal transmission between the fob and the ECM.
   
3. Examine the Transponder Chip:
   If the fob battery is fine, check the transponder chip inside the fob. In some cases, the chip can become damaged or lose its programming, requiring reprogramming or replacement.
   
4. Reset the Ignition System:
   Some issues with the keyless ignition system can be fixed by resetting the machine’s ECM. To do this, disconnect the battery for a few minutes, then reconnect it to reset the computer. This may help resolve minor software glitches or communication issues.
   
5. Test the ECM:
   If all other components appear functional but the machine still won’t start, the ECM could be the cause of the problem. Use a diagnostic tool to check the ECM for any error codes or signs of failure. In some cases, the ECM may need to be reprogrammed or replaced.
   
6. Check the Ignition Switch:
   A faulty ignition switch can also prevent the machine from starting. Inspect the switch for signs of damage or wear, and if necessary, replace it with a new one.
   
7. Consult the Error Codes:
   Many modern Bobcat machines, including the 773, feature onboard diagnostic systems that display error codes. These codes can be invaluable in pinpointing the exact issue with the keyless ignition system. Use the display panel to check for any error codes related to the ignition system.
   
8. Seek Professional Help:
   If you’ve completed the above troubleshooting steps and the problem persists, it may be time to consult a professional mechanic or Bobcat service technician. They can perform in-depth diagnostics and address more complex issues such as faulty ECMs or advanced wiring problems.
   

Preventive Maintenance Tips
To reduce the risk of keyless ignition issues and keep your Bobcat 773 running smoothly, here are some preventive maintenance tips:

1. Regularly Replace the Fob Battery:
   Fob batteries should be replaced regularly, even if they seem to be working fine. This simple maintenance task can prevent many ignition problems.
   
2. Keep Electrical Connections Clean and Tight:
   Periodically inspect and clean all electrical connectors to prevent corrosion and ensure solid connections.
   
3. Update the Software:
   Keep the ECM’s software up-to-date to prevent software-related issues that can impact the keyless ignition system.
   
4. Protect the Fob:
   Protect your ignition fob from physical damage. A dropped or cracked fob may have internal damage that could interfere with communication between the fob and the ECM.
   
5. Check the System After Winter Storage:
   If you store your Bobcat 773 for the winter or any extended period, be sure to check the keyless ignition system before starting it again. Cold weather can affect battery life, and moisture buildup can lead to electrical issues.
   

Conclusion
Keyless ignition systems, such as the one used in the Bobcat 773, offer convenience, security, and efficiency. However, when issues arise with these systems, it’s important to diagnose and address the problem promptly to avoid prolonged downtime. By understanding the common causes of keyless ignition issues, performing basic troubleshooting steps, and following preventive maintenance practices, you can ensure that your Bobcat 773 remains reliable and ready for any job.