Mercury 225 EFI User Manual

IGNITION
Page 2A-20 90-884294 OCTOBER 2001
Cylinder Head Temperature Sensor
Two (2) temperature sensors are used to provide temperature information to the ECM.
One sensor is mounted in each cylinder head.
The ECM uses this information to increase injector pulse width for cold starts and to retard
timing in the event of an over-heat condition. Should a temperature sensor fail, the ECM
will default to a temperature value of 32 °F (0 °C).
a
b
59037
a-Cylinder Temperature Sensor (PORT)
b-Cylinder Temperature Sensor (STARBOARD)
Air Temperature Sensor
The air temperature sensor is mounted on top of the air plenum. The ECM regulates fuel
flow, in part, based on manifold air temperature. As air temperature increases, the ECM
decreases fuel flow. Should the air temperature sensor fail, the ECM will default to a tem-
perature value of 32 °F (0 °C).
59025
a
a-Air Temperature Sensor

Mercury 225 EFI Specifications

General

Engine Type	V6
Horsepower	225 hp
Steering	Remote
Fuel Induction System	Electronic Fuel Injection (EFI)
Alternator Output	60 Amp
Shaft Length	20", 25"
Weight	505 lbs
Full Throttle RPM Range	5000-5800