57
ENGINE MANAGEMENT MODULE (EMM)
INTERNAL SENSORS
4
5 V Circuit Sensor
Monitors the EMM’s 5 V sensor circuit.
If sensor voltage is less than 4.75 volts, the EMM:
Barometric Pressure Sensor
Supplies the EMM with barometric pressure read-
ing to compensate for changes in a ltitude and air
density.
If the BP sensor reads less than 13 KPa or greater
than 119.0 KPa, or the senso r or circuit fails, the
EMM:
If the BP se nsor reads less than 70 KPa, the
EMM:
If the BP sensor reads greater than 105 KPa, the
EMM:
Exhaust Pressure Sensor
The exhaust pressure se nsor mon itors exhaust
pressure during all running conditions to compen-
sate for engine loads.
If the sen sor reads less than -85 in. wa ter, or
greater than 85 in. water , or the senso r or circuit
fails, the EMM:
If exhaust pressure is less than 40 in. water , the
EMM:
If exhaust pressure is gre ater than 80 in. wate r,
the EMM:
Stores service code 78
EMM LED 3: OFF (Cranking)
EMM LED 3: ON (Running)
Stores service code 44
Stores service code 45
Stores service code 46
Stores service code 87
EMM LED 3: OFF (Cranking)
EMM LED 3: ON (Running)
Stores service code 88
EMM LED 3: OFF (Cranking)
EMM LED 3: ON (Running)
Stores service code 89
EMM LED 3: OFF (Cranking)
EMM LED 3: ON (Running)
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