ShiftDmdSensor1_RangeHigh
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Caution 100% 1063‑24 Yes 2
Explanation
The primary encoder in the shift demand sensor does not appear to be working properly; the PCM received a signal that is
above the valid limit.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Correct the wiring problem.
• Replace the sensor.
ShiftDmdSensor1_RangeLow
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Caution 100% 1063‑25 Yes 2
Explanation
The primary encoder in the shift demand sensor does not appear to be working properly; the PCM received a signal that is
below the valid limit.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Correct the wiring problem.
• Replace the sensor.
ShiftDmdSensor2_RangeHigh
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Caution 100% 1064‑24 Yes 2
Explanation
The secondary encoder in the shift demand sensor does not appear to be working properly; the PCM received a signal that is
above the valid limit.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Correct the wiring problem.
• Replace the sensor.
ShiftDmdSensor2_RangeLow
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Caution 100% 1064‑25 Yes 2
Fault Codes
Page 4A-36 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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