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ENGINE MANAGEMENT MODULE (EMM)

SENSORS AND FUNCTIONS

Barometric Pressure Sensor

Supplies the EMM with barometric pressure read-

ing to compensate for changes in altitude and air

density.

If the BP sensor is out of the expected range

(below 13.3 KPa or above 119.0 KPa), or the sen-

sor or circuit fails, the EMM:

If the BP sensor is below expected range (below

70 KPa), the EMM:

If the BP sensor is above expected range (above

105 KPa), the EMM:

Exhaust Pressure Sensor

Monitors exhaust pressure during all running con-

ditions to compensate for engine loads.

If the exhaust pressure sensor is not in the

expected range (< 0.12 V or > 4.88 V ), or the sen-

sor or circuit fails, the EMM:

If the exhaust pressure is below expected range

(below 40 in. water), the EMM:

If the exhaust pressure is above expected range

(above 80 in. water), the EMM:

External Sensors

The EMM provides a 5 V DC signal for sensor cir-

cuits. It monitors all sensor voltage inputs and

compares them to predetermined acceptable

ranges. Inputs that fall outside of the acceptable

range initiate service codes.

Air Temperature Sensor

Monitors the air temperature at the throttle body.

The air temperature sensor is a negative tempera-

ture coefficient (NTC) thermistor. As temperature

increases, the resistance of the sensor decreases

resulting in a lower voltage reading at the EMM.

Temperature decreases result in a resistance

increase and a higher voltage reading at the

EMM.

If the AT sensor voltage is out of the expected

range, or the sensor or circuit fails, the EMM:

Engine Temperature Sensor(s)

Monitor the temperature for each cylinder head.

The sensor is a negative temperature coefficient

thermistor (NTC). It provides engine temperature

information to the EMM. The EMM uses this infor-

mation to control engine operation and to activate

the overheat warning system.

If PORT cylinder head temperature exceeds

194°F (90°C), the EMM:

If STARBOARD cylinder head temperature

exceeds 194°F (90°C), the EMM:

Stores a service code 44