ENGINE <NON-TURBO>
-
Control System
1-17
ENGINE COOLANT TEMPERATURE SENSOR
The coolant temperature sensor provides an input
i
voltage to the power-train control module (PCM).
The PCM determines engine coolant temperature
from the engine coolant temperature sensor.
As coolant temperature varies, the coolant
tempera-
ture sensor’s resistance changes, resulting in a
dif-
ferent input voltage to the PCM.
N71AKQ3AA
When the engine is cold, the PCM will demand
slightly richer air-fuel mixtures and higher idle
speeds until normal operating temperatures are
reached.
The engine coolant sensor threads into the water
jacket below the thermostat housing. New sensors
have sealant applied to the threads.
Thermostat
housing
\
Engine coolant
temperature
\
AFUO066
THROlTLE
POSITION SENSOR
The throttle position sensor mounts to the side of the throttle body.
id
N71AKO4AA