SysVolt_RangeHigh
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 621‑4 Yes 3
Explanation
Battery voltage is above the normal limit; the battery voltage as seen by the PCM is valid, but is higher than expected.
Possible Causes
• Alternator failed
Summary of Fault Correction Possibilities
• Replace the alternator.
SysVolt_RangeLow
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 100% 621‑5 Yes 3
Explanation
Battery voltage is below the normal limit; the battery voltage as seen by the PCM is valid, but is lower than expected.
Possible Causes
• Alternator is not charging
• Fusible link is failed
• More current draw than alternator can supply
• Wiring problem
Summary of Fault Correction Possibilities
• Inspect the alternator.
• Inspect the fusible link.
• Reduce the charging system draws.
• Inspect the alternator wiring for problems, and repair as necessary.
T ..........
TPS1_ETC_NoAdapt
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 341‑6 Yes 2
Explanation
The TPS 1 signal was outside the valid range when trying to adapt. Adapt occurs upon engine key‑up.
Possible Causes
• Low system voltage to ETC
• Defective throttle position sensor
Summary of Fault Correction Possibilities
• Inspect the wiring for problems, and correct as necessary.
• Replace the throttle body assembly
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-41
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