Summary of Fault Correction Possibilities
• Use the correct fob.
• Inspect the wiring, and repair as necessary.
• Repeat the system setup.
Security_Setup
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky None 5% 4503‑23 No 4
Explanation
The security device is not set up.
Possible Causes
• Setup not completed
Summary of Fault Correction Possibilities
• Set up security system.
SHFT_OutputFault
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 3049‑16 Yes 3
Explanation
The shift actuator does not appear to be working properly; the PCM detected a problem when trying to send a signal to the
actuator.
Possible Causes
• Wiring problem
• Shift actuator failed
• Gearcase problem
Summary of Fault Correction Possibilities
• Inspect the wiring to the shift actuator, repair as necessary.
• Replace the shift actuator.
• Inspect the gearcase for free shifting.
ShiftDemandSensor_Diff
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Critical 5% 1077‑6 Yes 4
Explanation
The shift demand sensor does not appear to be working properly.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Correct the wiring problem.
• Replace the sensor.
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-35
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