Guardian_Overspeed
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None 100% 2091‑23 No 4
Explanation
Engine Guardian is active due to excessive engine speed.
Possible Causes
• Engine is improperly propped
• Engine is mounted too high
• Engine is being trimmed too high
• Propeller is cavitating
Summary of Fault Correction Possibilities
• Install the correct propeller on the engine.
• Correct the installation issues.
• Refrain from trimming engine too high.
• Test with alternate propeller.
Guardian_uXPowerLimit
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None Variable 2101‑23 Yes 4
Explanation
Engine Guardian is active due to a helm fault. Power will be limited as the control system may be compromised.
Possible Causes
• The command module has detected an issue and has enacted Guardian
Summary of Fault Correction Possibilities
• Use the CDS G3 diagnostic tool to read the command module faults.
•
Refer to the DTS Diagnostic Manual P/N 8M0057654 for fault explanations.
Guardian_Voltage
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution Variable 2111‑23 Yes 4
Explanation
Engine Guardian is active due to high or low battery voltage. Power will be limited to prevent engine damage.
Possible Causes
• Failed alternator
• Failed fusible link
Summary of Fault Correction Possibilities
• Replace the alternator.
• Replace the fusible link.
Fault Codes
Page 4A-22 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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