8-28
Electrical System
4st 25/30 2022
3) Inspection of the T-MAP Sensor
1
234
Inspect the MAT sensor when the engine is cold.
Inspection of the MAT Sensor
1. Measure the ambient temperature.
2. Connect a computer to the outboard motor and use the
diagnosis system to display "Air Temperature (Intake Air
Temperature)."
3. Replace the T-MAP sensor if the difference between the
ambient temperature and "Air Temperature (Intake Air
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The MAP (manifold pressure) sensor and MAT
(intake air temperature) sensor are integrated in
this sensor.
MAT (Intake Air Temperature)
Sensor Resistance (Reference Value):
Between Vout temperature 4 and GND
terminal 2:
WRNї&
WRNї&
* If the ambient temperature is neither, refer to
the graph on the right.
4.
Measure the MAT sensor resistance. Replace the T-MAP
sensor if the value is not as specified.
This test can be conducted without removing the
part.
26650
2099
119
−30 25 120
±12.7％
±11.9％
±16.8％
Temperature(℃)
Resistance(Ω)
MAX
MIDDLE
MIN
Inspection of the MAP Sensor
1. Measure the MAP sensor resistance. Replace the T-MAP
sensor if the value is not as specified.
MAP (Intake Air Temperature) Sensor
Resistance (Reference Value):
Between Vout temperature
4
and Vout MAP
1:
Not conductive
Between Vout temperature
4
and Vcc
3:
Not conductive
4)
Inspection of the Fuel Feed Pump (FFP)
1. Turn the key switch to "ON" and check the operation of the
fuel feed pump (FFP) 1.
2. Check for the operating sound of the fuel feed pump
(FFP). If it cannot be heard, check the electrical system.
This test can be conducted without removing the
component.
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