Possible Causes
• Wiring problem
• Defective throttle position sensor
Summary of Fault Correction Possibilities
• Inspect the wiring for problems, and correct as necessary.
• Replace the throttle body assembly.
TPS2_RangeLow
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky Caution 100% 302‑25 Yes 2
Explanation
This fault indicates that the TPS 2 sensor circuit is shorted to power.
Possible Causes
• Wiring problem
• Defective throttle position sensor
Summary of Fault Correction Possibilities
• Inspect the wiring for problems, and correct as necessary.
• Replace the throttle body assembly.
TRMD_OutputFault
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 3182‑16 Yes 2
Explanation
The trim down relay does not appear to be working properly; the PCM detected a problem when trying to send a signal to the
trim down relay.
Possible Causes
• Wiring problem
• Failed trim down relay
• 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 down relay.
• Inspect the power trim system for lack of movement.
TRMU_OutputFault
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 3181‑16 Yes 2
Explanation
The trim up relay does not appear to be working properly; the PCM detected a problem when trying to send a signal to the trim
up relay.
Possible Causes
• Wiring problem
• Failed trim up relay
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-43
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