Summary of Fault Correction Possibilities
• Inspect the wiring to the sensor, repair as necessary.
• Replace the sensor.
StbdECT_RangeLow
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 521‑25 Yes 2
Explanation
The engine coolant temperature (ECT) 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
• Inspect the wiring to the sensor, repair as necessary.
• Replace the sensor.
STRT_OutputFault
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 3171‑16 Yes 3
Explanation
The starting system does not appear to be working properly; the PCM detected a problem when trying to send a signal to the
start relay. The engine may not start.
Possible Causes
• Wiring problem
• Start relay failed
• Starter failed
Summary of Fault Correction Possibilities
• Check the wiring to the relay and to the starter, repair as necessary.
• Replace the start relay.
• Replace the starter.
SysVolt_FaultBlocker
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 4602‑23 Yes 3
Explanation
Battery voltage is outside of specified limits.
Possible Causes
• Battery switch is not turned on
• Overcharging or undercharging due to faulty alternator
Summary of Fault Correction Possibilities
• Turn the battery switch on.
• Replace the alternator.
Fault Codes
Page 4A-40 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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