• Faulty terminator resistor
Summary of Fault Correction Possibilities
• Correct the wiring problem.
• Install the correct count of resistors.
• Replace the faulty resistor.
Dual_DemandSen_Fault
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 5% 1074‑6 Yes 4
Explanation
The throttle demand sensor does not appear to be working properly.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Repair the wiring.
• Replace the sensor.
Dual_ShiftDemandSen_Fault
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Critical 5% 1078‑6 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
• Repair the wiring.
• Replace the sensor.
Dual_ShiftPosSen_Fault
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 1025‑6 Yes 4
Explanation
The shift position sensors do not appear to be working properly.
Possible Causes
• Shift actuator wiring problem
• Failed shift actuator
Summary of Fault Correction Possibilities
• Inspect the wiring to the shift actuator.
• Replace the shift actuator.
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-13
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