Dual_TPS_Faults
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 7% 311‑6 Yes 4
Explanation
The throttle position sensors (TPS) do not agree.
Possible Causes
• ETC wiring problem
• Failed throttle body assembly
Summary of Fault Correction Possibilities
• Inspect the wiring to the ETC.
• Replace the throttle body assembly.
E ..........
EGT_Overtemp
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 10% 2124‑20 Yes 4
Explanation
The value from the exhaust gas temperature (EGT) sensor is higher than normal, indicating that the exhaust manifold is
overheating.
Possible Causes
• Restricted water flow
• Plugged exhaust sprayer
• Wiring problem
• Defective sensor
Summary of Fault Correction Possibilities
• Restore the water flow.
• Remove debris from the sprayer.
• Inspect the wiring.
• Check the sensor, replace if required.
EGT_RangeHigh
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 572‑24 Yes 2
Explanation
The exhaust gas temperature (EGT) 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.
• Check the sensor.
• Check the exhaust sprayer outlets for obstructions.
Fault Codes
Page 4A-14 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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