Rodeo LS 4WD V6-3.2L (1998)
Manifold Absolute Pressure Sensor: Description and Operation
DESCRIPTION AND OPERATION
The manifold absolute pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). The MAP sensor signal voltage to the
Powertrain Control Module (PCM) varies from below 2 volts at idle (high vacuum) to above 4 volts with the ignition "ON", engine not running or
at wide-open throttle (low vacuum).
The MAP sensor is used to determine the following:
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Manifold pressure changes while the linear Exhaust Gas Recirculation (EGR) flow test diagnostic is being run. Refer to DTC P0401.
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Engine vacuum level for other diagnostics.
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Barometric pressure (BARO).
If the PCM detects a voltage that is lower than the possible range of the MAP sensor, DTC PO107 will be set. A signal voltage higher than the
possible range of the sensor will set DTC PO108. An intermittent low or high voltage will set DTC P1107 or P1106, respectively. The PCM can
detect a shifted MAP sensor. The PCM compares the MAP sensor signal to a calculated MAP based on throttle position and various engine load
factors. If the PCM detects a MAP signal that varies excessively above or below the calculated value, DTC PO106 will set.
