• Restricted sensor reference hose
• Valve train issue
Summary of Fault Correction Possibilities
• Replace the sensor.
• Correct the wiring problem.
• Check the reference hose for leaks.
• Check the cylinder leak down.
MAP_Time_RangeLow
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 401‑25 Yes 2
Explanation
The manifold absolute pressure (MAP) sensor does not appear to be working properly; the PCM received a signal that is below
the valid limit.
Possible Causes
• Sensor out of range
• Wiring problem
• Restricted sensor reference hose
• Valve train issue
Summary of Fault Correction Possibilities
• Replace the sensor.
• Correct the wiring problem.
• Check the reference hose for leaks.
• Check the cylinder leak down.
MAPR_TPS1Rationality
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky Caution 100% 404‑6 Yes 2
Explanation
The values received from the manifold absolute pressure (MAP) sensor and the primary 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.
Fault Codes
Page 4A-26 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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