MAPR_TPS2Rationality
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 405‑6 Yes 2
Explanation
The values received from the manifold absolute pressure (MAP) sensor and the secondary encoder in the throttle position
sensor (TPS) do not agree.
Possible Causes
• MAP or ETC wiring problem
• ETC opening is restricted or airflow to the engine is restricted
• Intake manifold has vacuum leak
• MAP sensor or ETC is failed
Summary of Fault Correction Possibilities
• Correct the MAP sensor or ETC wiring problem.
• Inspect the cold air intake assembly for obstructions.
• Inspect the intake manifold for air leaks.
• Replace the MAP sensor or throttle body assembly.
MicroChi_PWM_ADC
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Critical 5% 4003‑6 Yes 4
Explanation
There is a communication problem with the SmartCraft control system.
Possible Causes
• Wiring problem
• Clean power issue
• Failed command module
Summary of Fault Correction Possibilities
• Inspect the helm wiring.
• Inspect the clean power harness.
• Replace the command module.
N ..........
Neutral_Overspeed
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None 100% 2092‑23 No 1
Explanation
Engine speed is above specified limits with the engine in neutral.
Possible Causes
• Engine is not in gear
• Shift demand sensor failed
Summary of Fault Correction Possibilities
• Shift the engine into gear.
• Inspect the shift demand sensor.
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-27
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