IJ Scan Utility Lite Cannot Detect Canon TS9540, TS9550, or TS9550A on macOS: Errors 157, 201, and 202

Last Updated on 18.07.2026 by DriverNew

Canon IJ Scan Utility Lite may stop detecting a Canon TS9500 Series scanner after a macOS update, a router restart, the Mac wakes from sleep, or the network connection changes.

When you click Auto, Document, Photo, or Custom, a message appears stating that communication with the scanner cannot be established. Sometimes the application starts, but the scanner list remains empty or an old device is selected.

This guide applies to the following models:

• Canon PIXMA TS9540;
• Canon PIXMA TS9540A;
• Canon PIXMA TS9541C;
• Canon PIXMA TS9541CA;
• Canon PIXMA TS9550;
• Canon PIXMA TS9550A;
• Canon PIXMA TS9551C;
• Canon PIXMA TS9551CA.

In Canon applications and macOS, the device may appear under the common name:

Canon TS9500 series

The main steps apply to:

• macOS Tahoe 26;
• macOS Sequoia 15;
• macOS Sonoma 14;
• macOS Ventura 13;
• Mac computers with Apple silicon;
• Mac computers with Intel processors.

Exact Error 157 Message

The following message may appear in IJ Scan Utility Lite:

Cannot communicate with scanner for these reasons:
- Scanner is turned off.
- (If using Wired LAN connection) It is disconnected from Wired LAN.
- (If using wireless LAN connection) Signal strength is poor due to obstructions.
- Network connection is prohibited by security software.
- Different scanner on the network is selected.

Check the above and try scanning again.
If you still cannot communicate, restart the computer.

Error 157

The main causes of Error 157 are:

• the printer is turned off;
• an error is displayed on the Canon screen;
• the printer lost its Wi-Fi connection;
• the Ethernet cable is disconnected;
• the Wi-Fi signal is too weak;
• the Mac and Canon printer are on different networks;
• a guest network is being used;
• a VPN is blocking the local connection;
• security software is blocking IJ Scan Utility Lite;
• another Canon device is selected in the application;
• the Bonjour service name has changed;
• Bonjour is disabled on the printer;
• another user or application is already using the scanner.

Exact Error 201 Message

A required file is missing or corrupted, or settings are incorrect.
Try the installation again.

Error 201

Error 201 means that one of the IJ Scan Utility Lite components or the system scanning driver is missing, damaged, or installed incorrectly.

The problem may appear:

• after a major macOS update;
• after applications are transferred from an old Mac;
• after Canon applications are removed incompletely;
• after the system is restored from a backup;
• when an old installer is used;
• when the installer does not match the current macOS version;
• when the installation was interrupted;
• when antivirus software removed or blocked an application component.

Exact Error 202 Message

An internal error has occurred.

Take the following measures:

* Check the scanner status.
* Restart the scanner.
* Restart the computer, then try again.
* Reinstall the scanner driver.

Error 202

Error 202 indicates an internal failure in the application or scanning component.

It may occur if:

• the Canon printer did not complete the previous job;
• the application became unresponsive after the Mac woke from sleep;
• the scanner is being used by another application;
• the network connection was interrupted during scanning;
• a Canon background process is not working correctly;
• the application is incompatible with the updated macOS version;
• the scanning component is damaged.

Check the Canon Printer Without the Mac First

Before changing any settings, make sure the scanning component of the multifunction printer is working.

1. Turn on the Canon printer.
2. Wait for the Home screen to appear.
3. Check whether a support code is displayed.
4. Place a document face down on the scanner glass.
5. Load A4 plain paper.
6. On the touchscreen, select Copy.
7. Tap Black.

If the copy prints:

• the scanning unit is working;
• the problem is related to the Mac, network, or application;
• proceed to checking system scanning.

If copying is unavailable or a support code appears on the screen, resolve the hardware error first.

Check Scanning Without IJ Scan Utility Lite

Through Printers & Scanners

1. Open the Apple menu.
2. Select System Settings.
3. Open Printers & Scanners.
4. Select Canon TS9500 Series.
5. Click Open Scanner.
6. Place a document on the scanner glass.
7. Select the destination folder.
8. Click Scan.

Through Image Capture

1. Press Command + Space.
2. Enter:

   Image Capture

3. Open the application.
4. Select Canon on the left side of the window.
5. Perform a test scan.

How to Evaluate the Result

If system scanning works but IJ Scan Utility Lite displays an error:

• do not remove the printer from macOS;
• do not reset the printing system;
• check Local Network access;
• check the device selected in the application;
• restart or reinstall only the Canon application.

If no application can detect the Canon device, check the network, Bonjour, and how the multifunction printer was added.

Method 1: Quit All Scanning Applications Completely

The scanner usually cannot be used by several applications at the same time.

Quit:

• IJ Scan Utility Lite;
• Image Capture;
• Preview;
• Adobe Acrobat;
• OCR applications;
• document management applications;
• other scanning applications.

To quit an application normally:

1. switch to the application;
2. press Command + Q;
3. wait several seconds.

If the Application Is Unresponsive

1. Press:

   Option + Command + Esc

2. Select IJ Scan Utility Lite.
3. Click Force Quit.
4. Quit the other scanning applications.
5. Open only IJ Scan Utility Lite.

Unsaved data in a force-quit application may be lost.

Method 2: Restart the Canon Printer and Mac

For Errors 157 and 202, Canon recommends checking the scanner status and restarting the devices.

1. Quit IJ Scan Utility Lite.
2. Turn off the printer using the power button.
3. Wait until the power lamp turns off.
4. Restart the Mac.
5. Turn on the Canon printer.
6. Wait for the Home screen to appear.
7. Wait another minute.
8. Start IJ Scan Utility Lite.
9. Refresh the scanner list.
10. Try scanning again.

If a network connection is being used and the error remains, restart the router as well.

Method 3: Restart the Local Network

1. Quit all scanning applications.
2. Turn off the Canon printer.
3. Shut down the Mac.
4. Disconnect the router from the power supply.
5. Wait approximately one minute.
6. Reconnect the router to the power supply.
7. Wait until Wi-Fi and Internet access are fully restored.
8. Turn on the Canon printer.
9. Wait for the active network icon to appear.
10. Turn on the Mac.
11. Wait one or two minutes.
12. Start IJ Scan Utility Lite.

After startup, the Canon printer may need some time to register its Bonjour service again.

Method 4: Make Sure Both Devices Are on the Same Wi-Fi Network

On the Mac

1. Open System Settings.
2. Select Wi-Fi.
3. Write down the name of the active network.

On the Printer

1. Tap the network icon on the touchscreen.
2. Select Wi-Fi.
3. Open the current connection information.
4. Check the SSID network name.

The Mac and Canon printer must be on the same local network.

Do Not Use a Guest Network

Do not connect the devices to a network whose name contains:

• Guest;
• Guest Network;
• Visitor;
• Public;
• Hotspot.

A guest network may provide Internet access but block communication between the Mac and multifunction printer.

Method 5: Temporarily Disable the VPN

1. Quit IJ Scan Utility Lite.
2. Disconnect the VPN application you are using.
3. Open System Settings → VPN if that section is displayed.
4. Disconnect the active connection.
5. Wait several seconds.
6. Start IJ Scan Utility Lite again.
7. Refresh the scanner list.

If the Canon device appears, find a setting in the VPN application that allows access to local devices.

It may be called:

• Allow LAN Traffic;
• Local Network Access;
• Bypass VPN for Local Devices;
• Allow Local Network.

Method 6: Allow Local Network Access

This check is required in macOS Sequoia 15, macOS Tahoe 26, and later versions.

Without permission, IJ Scan Utility Lite may:

• fail to detect the Canon device;
• display Error 157;
• display an empty scanner list;
• fail to start network scanning;
• fail to display the Mac on the multifunction printer’s operation panel;
• work over USB but not over Wi-Fi.

Enable Permission

1. Open the Apple menu.
2. Select System Settings.
3. Open Privacy & Security.
4. Select Local Network.
5. Find:
   • Canon IJ Scan Utility Lite;
   • CIJSULAgent.
6. Turn on the switches next to both components.
7. Allow access for any other Canon network applications you use.
8. Close System Settings.
9. Quit IJ Scan Utility Lite completely.
10. Open it again.

If the Application Is Not Listed

1. Start IJ Scan Utility Lite.
2. Try refreshing the scanner list.
3. When the macOS prompt appears, click Allow.

If the prompt does not appear:

1. quit the application;
2. restart the Mac;
3. start IJ Scan Utility Lite again;
4. refresh the list again.

Method 7: Select the Correct Canon Device in the Application

Error 157 often appears when IJ Scan Utility Lite has saved an old or different device.

Open the Application

1. Open Finder.
2. From the menu bar, select Go → Applications.
3. Open the Canon Utilities folder.
4. Open the IJ Scan Utility folder.
5. Start Canon IJ Scan Utility Lite.

Check the Scanner Field

At the top of the main window is the following field:

Scanner

The application displays the Bonjour service name of the selected device.

1. Open the Scanner list.
2. Select the actual Canon TS9500 Series device.
3. Do not select an old printer, a Wireless Direct entry, or another Canon multifunction printer.
4. Click the button to refresh the list.
5. Wait several seconds.

If USB Is Being Used

With a USB connection, the following may appear after the name:

USB

Select the USB entry if the Canon printer is connected directly to the Mac with a cable.

Method 8: Refresh the Scanner List

The refresh button is located next to the Scanner field.

1. Make sure the Canon printer is turned on.
2. Check the network icon on the printer.
3. Click Refresh in IJ Scan Utility Lite.
4. Wait for the search to finish.
5. Open the Scanner list again.
6. Select the correct Bonjour name.

Refreshing is especially important if:

• the router was replaced;
• the Bonjour name changed;
• the printer was switched from Wi-Fi to Ethernet;
• Wireless Direct was previously used;
• the Canon printer received a new network address;
• several identical models are installed on the network.

Method 9: Check Bonjour on the Canon Printer

Canon states that IJ Scan Utility Lite cannot be used over a network if Bonjour is disabled.

1. On the touchscreen, select Setup.
2. Open Device settings.
3. Select LAN settings.
4. Select the connection being used.
5. Open the advanced settings.
6. Select Bonjour settings.
7. Set it to Enable.

Also check the Bonjour service name.

After changing the setting:

1. turn off the Canon printer;
2. turn it on again;
3. wait one or two minutes;
4. restart IJ Scan Utility Lite;
5. refresh the Scanner list.

Method 10: Check Access to the Canon Printer Through Safari

1. Open the network information on the printer’s screen.
2. Write down the IPv4 address.

Example address:

192.168.1.125

Use your Canon printer’s actual address, not the value from this example.

3. Open Safari.
4. Enter the printer’s IP address.
5. Press Enter.

If the Remote UI page opens:

• the Mac can detect the Canon printer on the network;
• check Bonjour, Local Network permission, and the selected scanner;
• the network itself is generally working.

If the page does not open:

• check the SSID;
• disable the VPN;
• restart the router;
• check whether a guest network is being used;
• check the signal strength;
• check the firewall settings.

Method 11: Check Security Software

The official Error 157 message states that the network connection may be blocked by security software.

Check:

• third-party antivirus software;
• a network filter;
• a corporate VPN;
• a network connection control application;
• a security DNS filter;
• a corporate firewall.

Allow local network access for:

• Canon IJ Scan Utility Lite;
• CIJSULAgent;
• Canon components;
• Bonjour services.

Do not disable security permanently. For testing, you can temporarily stop only the third-party network filter and then enable it again.

Method 12: Check the Built-In macOS Firewall

1. Open System Settings.
2. Select Network.
3. Open Firewall.
4. Check the advanced settings.

If all incoming connections are being blocked, temporarily disable only this option for testing.

Restore the secure settings after troubleshooting.

Method 13: Check a Direct USB Connection

A USB test helps distinguish a network problem from a damaged application.

1. Turn on the Canon printer.
2. Connect a USB Type-B cable to the multifunction printer.
3. Connect the other end directly to the Mac.
4. Do not use a hub or docking station for the initial test.
5. Wait several minutes.
6. Start IJ Scan Utility Lite.
7. Open the Scanner list.
8. Select the entry marked as USB.
9. Click Document.

If USB scanning works:

• IJ Scan Utility Lite is installed;
• the Canon scanning component is working;
• the error is related to Wi-Fi, Bonjour, the router, or Local Network permission.

If the USB Scanner Is Not Detected

1. Disconnect the cable.
2. Try another USB port.
3. Try another working cable.
4. If USB-C is being used, replace the adapter.
5. Do not connect the Canon printer through a monitor.
6. Restart the Mac.

Check whether the device is physically detected:

1. Hold down the Option key.
2. Open the Apple menu.
3. Select System Information.
4. Open the USB section.
5. Find Canon TS9500 Series.

If Canon is missing from the USB section, the problem may be related to the cable, adapter, Mac port, or multifunction printer connector.

Resolving Error 157

Perform the following steps in the specified order:

1. Make sure the Canon printer is turned on.
2. Resolve any support code displayed on the screen.
3. Check the Wi-Fi or Ethernet connection.
4. Connect the Mac and Canon printer to the same network.
5. Do not use a guest network.
6. Disable the VPN.
7. Quit other scanning applications.
8. Allow Local Network access for IJ Scan Utility Lite.
9. Allow Local Network access for CIJSULAgent.
10. Check Bonjour on the printer.
11. Refresh the Scanner list.
12. Select the correct Bonjour name.
13. Restart the Canon printer and Mac.
14. Check scanning over USB.

Resolving Error 201

For Error 201, the application and scanning components must be reinstalled.

Perform a Basic Check First

1. Quit IJ Scan Utility Lite.
2. Restart the Mac.
3. Check Image Capture.
4. Check the available disk space.

If system scanning works, the fault is limited to the Canon application.

Download the Current Application

1. Open the official support page for your Canon model.
2. Select the installed macOS version.
3. Find IJ Scan Utility Lite.
4. If Canon provides a separate ICA driver or scanning package, check its compatibility with your version of macOS.
5. Download only current files.

Do not use:

• the supplied disc;
• an old saved copy of the installer;
• a package intended for another model;
• a Windows application;
• a file from a third-party website.

Reinstall the Application

1. Quit all scanning applications.
2. Open the downloaded Canon file.
3. Start the installation.
4. Follow the on-screen instructions.
5. Enter the administrator password if requested.
6. Allow the application to access the local network.
7. Restart the Mac after installation.
8. Start IJ Scan Utility Lite.
9. Select Canon in the Scanner field.
10. Perform a test scan.

Resolving Error 202

1. Check the Canon printer’s status.
2. Quit other scanning applications.
3. Turn off the multifunction printer.
4. Restart the Mac.
5. Turn on the Canon printer.
6. Wait for startup to finish.
7. Try scanning again.

If Error 202 remains:

1. check system scanning;
2. check the USB connection;
3. reinstall the current version of IJ Scan Utility Lite;
4. install the recommended Canon scanning component if it is available for your version of macOS.

Error After the Mac Wakes from Sleep

After sleep, the application may retain an inactive network connection.

1. Wake the Canon printer’s screen.
2. Check the network icon.
3. Wait one minute.
4. Quit IJ Scan Utility Lite by pressing Command + Q.
5. Open the application again.
6. Click Refresh.
7. Select the Canon printer again.

If the scanner does not appear:

1. turn Wi-Fi off and on again on the Mac;
2. disable the VPN;
3. restart the Canon printer;
4. restart the Mac;
5. check the IP address through Safari.

Error After Replacing the Router

After the router is replaced, the following may change:

• the network name;
• the Wi-Fi password;
• the Canon printer’s IP address;
• the Bonjour name or registration;
• the network subnet;
• device isolation settings.

1. Connect the Canon printer to the new network.
2. Make sure the Mac is using the same router.
3. Restart the Mac.
4. Start IJ Scan Utility Lite.
5. Click Refresh.
6. Select the new Canon entry.

If the device does not appear, add the Canon printer to macOS again as:

Bonjour Multifunction → Secure AirPrint

Error When Switching from USB to Wi-Fi

IJ Scan Utility Lite may continue using the old USB entry.

1. Connect the Canon printer to Wi-Fi.
2. Disconnect the USB cable.
3. Quit IJ Scan Utility Lite.
4. Restart the application.
5. Click Refresh.
6. In the Scanner field, select the Canon Bonjour name without the USB label.

Error When Switching from Wi-Fi to Ethernet

1. Connect the Ethernet cable to the router.
2. Enable the wired LAN on the Canon printer.
3. Wait for the printer to receive an IP address.
4. Restart IJ Scan Utility Lite.
5. Refresh the Scanner list.
6. Select the current Canon entry.

The Mac can continue using Wi-Fi if it is connected to the same router.

Other IJ Scan Utility Lite Error Codes

Error 152: Not Enough Memory

There is not enough memory.
Exit other applications to increase available memory.

Error 152

Quit other applications and try scanning again.

Error 153: Image Is Too Large

The image you attempted to scan is in a size that cannot be opened in the specified application.
Change the settings so that the image size is reduced.

Error 153

Reduce:

• the resolution;
• the scanning area size;
• the output format;
• the number of pages scanned at one time.

Error 231: Insufficient Disk Space

Cannot complete the scan.
The disk space is insufficient.

Error 231

Delete unnecessary files or select another drive.

Error 232: Disk Is Write-Protected

Select a writable folder or storage device.

Error 234: Function Is Not Supported

The selected scanning mode is unavailable for the device or current source.

Try:

• scanning from the scanner glass instead of the ADF;
• using Document mode instead of an unsupported mode;
• selecting another format or setting.

Errors 242, 243, and 244: No Access to the Folder

Check the permissions for the folder specified in the save field.

For testing, select a standard local folder:

• Pictures;
• Documents;
• Desktop.

Do not use the following for the initial test:

• a disconnected external drive;
• an unavailable network folder;
• a read-only folder;
• remote cloud storage without a connection.

Error 245: Text Was Not Recognized

Check:

• whether the OCR language matches the document language;
• whether the page contains readable text;
• whether the scan quality is high enough;
• whether the text is handwritten or decorative.

If IJ Scan Utility Lite Does Not Start

1. Restart the Mac.
2. Open Finder.
3. Go to Applications → Canon Utilities → IJ Scan Utility.
4. Start the application directly from the folder.

If the application closes immediately or becomes unresponsive:

• check for macOS updates;
• download the current version of the Canon application;
• do not use an old file transferred from another Mac;
• reinstall the application.

If macOS Blocks the Canon Installer

The following message may appear:

“Application” can’t be opened because Apple cannot check it for malicious software.

Do not disable macOS security completely.

1. Close the installer.
2. Make sure the file was downloaded from the official Canon website.
3. Delete the old copy.
4. Select the actual macOS version on the website.
5. Download the current installer.

If no official compatible package is available, use AirPrint scanning through Image Capture.

If the Application Works but Does Not Save the File

1. Open Settings in IJ Scan Utility Lite.
2. Select the scanning mode you use.
3. Check the Save in field.
4. Select a local folder.
5. Check the available disk space.
6. Try scanning again.

For the initial test, save the file in the Pictures folder.

Do You Need to Reset the Printing System?

A full printing system reset is usually unnecessary if:

• documents print successfully;
• Image Capture detects the Canon device;
• only IJ Scan Utility Lite is not working;
• the error is related to Local Network permission;
• the wrong scanner is selected.

Consider a reset only when both printing and system scanning are unavailable and removing and adding the device normally did not help.

When the Problem Is Not Related to IJ Scan Utility Lite

The application will not resolve the fault if:

• the Canon printer cannot make copies;
• the scanning unit does not move;
• a hardware support code is displayed;
• the ADF jams documents;
• the multifunction printer does not turn on;
• the device cannot connect to any network;
• USB is not detected on several computers;
• liquid entered the device.

When a Network Administrator Is Required

Contact the administrator if:

• the Mac and Canon printer are in different VLANs;
• Bonjour is blocked on the network;
• multicast traffic is prohibited;
• a corporate VPN is being used;
• a firewall is installed between the devices;
• the printer is available only through a print server;
• the network settings cannot be changed.

When a Service Center Is Required

Contact a service center if:

• copying without the Mac does not work;
• the scanning unit does not move;
• a hardware support code appears;
• USB scanning does not work on several computers;
• scanning is interrupted by cracking noises;
• the device was damaged after being dropped;
• there is a smell of overheating;
• liquid entered the device.