Mercury V8 300

• Power trim is not moving when system expected movement
Summary of Fault Correction Possibilities
• Inspect the wiring for problems, and correct as necessary.
• Replace the trim up relay.
• Inspect the power trim system for lack of movement.
TrimPos_RangeHigh
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 1012‑24 Yes 2
Explanation
The trim position sensor circuit is shorted.
Possible Causes
• Wiring problem
• Defective trim position sensor
Summary of Fault Correction Possibilities
• Inspect the wiring for problems, and correct as necessary.
• Replace the trim position sensor.
TrimPos_RangeLow
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 1012‑25 Yes 2
Explanation
The trim position sensor circuit is open.
Possible Causes
• Wiring problem
• Defective trim position sensor
Summary of Fault Correction Possibilities
• Inspect the wiring for problems, and correct as necessary.
• Replace the trim position sensor.
U ..........
UEGO1_HtrLwrLimit
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None 100% 822‑5 No 2
Explanation
The oxygen (O2) sensor does not appear to be working properly; the PCM received a signal that is valid, but is lower than
expected. The O2 sensor is not heating up.
Possible Causes
• O2 sensor fuse failed
• Wiring problem
• O2 sensor failed
Fault Codes
Page 4A-44 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018