Grand Cherokee 2WD L6-4.0L VIN S (1997)
Fig. 9 Throttle Body & Sensors
The intake manifold air temperature sensor is installed in the intake manifold with the sensor element extending into the air stream. The sensor
provides an input voltage to the Powertrain Control Module (PCM) indicating intake manifold air temperature. The input is used along with inputs
from other sensors to determine injector pulse width. As the temperature of the air-fuel stream in the manifold varies, the sensor resistance
changes. This results in a different input voltage to the PCM.
Leak Detection Pump (Switch) Sense
LEAK DETECTION PUMP (SWITCH) SENSE-PCM INPUT
Provides an input to the Powertrain Control Module (PCM) that the Leak Detection Pump (LDP) has been activated.
Manifold Absolute Pressure (MAP) Sensor
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR-PCM INPUT
The Manifold Absolute Pressure (MAP) sensor reacts to absolute pressure in the intake manifold. It provides an input voltage to the Powertrain
Control Module (PCM). As engine load changes, manifold pressure varies. The change in manifold pressure causes MAP sensor voltage to
change. The change in MAP sensor voltage results in a different input voltage to the PCM. The input voltage level supplies the PCM with
information about ambient barometric pressure during engine start-up (cranking) and engine load while the engine is running. The PCM uses this
input along with inputs from other sensors to adjust air-fuel mixture.
Fig. 9 Throttle Body & Sensors
The MAP sensor is mounted on the side of the engine throttle body. The sensor is connected to the throttle body with a rubber L-shaped fitting.
Oil Pressure Sensor
OIL PRESSURE SENSOR-PCM INPUT
Sends a signal from the oil pressure sending unit to the Powertrain Control Module (PCM) relating to engine oil pressure.
