Checking The Intake Air Pressure Sensor - SELVA MARINE Blue Whale 250 EFI Service Manual

– +
ELEC
3. Check that the difference between the
ambient temperature and the displayed
intake air temperature is within ± 5 °C (±
9 °F).
NOTE:
• Check the intake air temperature sensor
when the engine is cold.
• When checking the intake air temperature
sensor, remove the top cowling and do not
start the engine.
4. Disconnect the intake air temperature
sensor coupler.
5. Turn the engine start switch to ON.
6. Measure the input voltage at the intake
air temperature sensor coupler (wiring
harness end). Check the wiring harness
if out of specification.
Intake air temperature sensor input
voltage (reference data):
Black/yellow (B/Y) – Black (B)
4.75–5.25 V
7. Place the intake air temperature sensor
in a container of water and slowly heat
the water.
8-17
Electrical system
S6P28615E
S6P28730
8. Measure the intake air temperature sen-
sor resistance. Replace if out of specifi-
cation.
Intake air temperature sensor
resistance:
at 20 °C (68 °F): 2.21–2.69 kΩ
Checking the intake air pressure
sensor
1. Disconnect the intake air pressure sen-
sor coupler.
2. Turn the engine start switch to ON.
3. Measure the input voltage at the intake
air pressure sensor coupler (wiring har-
ness end). Check the wiring harness if
out of specification.
PORT
Intake air pressure sensor input
voltage (reference data):
Orange (O) – Black (B)
4.75–5.25 V
4. Remove the intake air pressure sensor,
and then connect the coupler.
5. Connect the special service tool.
S6P28625E
S6P28280
6P23H11