OilLevel_Sensor_Invalid
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None 100% 711‑12 No 2
Explanation
The engine oil level sensor does not appear to be working properly.
Possible Causes
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Inspect the wiring to the sensor, and repair as necessary.
• Replace the sensor.
OilPress_Low
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 5% 431‑21 Yes 4
Explanation
The engine oil pressure appears to be low; the PCM received a signal from the oil pressure sensor that is lower than the
specified threshold.
Possible Causes
• Low oil level
• Wiring problem
• Defective sensor
• Oil pickup restricted
• Mechanical problem in powerhead/oil pump
Summary of Fault Correction Possibilities
• Add engine oil.
• Inspect the wiring to the sensor, and repair as necessary.
• Replace the sensor.
• Check the oil pickup tube and screen for obstructions.
• Inspect the powerhead/oil pump.
OilPress_RangeHigh
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 431‑24 Yes 2
Explanation
The oil pressure 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
• Inspect the wiring to the sensor, and repair as necessary.
• Replace the sensor.
Fault Codes
Page 4A-30 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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