Circuit Description

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.

Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). MAP sensor signal voltage to PCM varies from less than 2 volts at idle (high vacuum) to more than 4 volts at wide open throttle (low vacuum) at sea level.

A speed density method of determining engine load is used on 2.2L engine, Engine load is calculated using inputs from MAP sensor, RPM sensor Crankshaft Position (CKP) sensor and Intake Air Temperature (IAT) sensor. MAP sensor is main sensor used in calculating engine load. MAP sensor is also used to detect manifold pressure changes during Exhaust Gas recirculation (EGR) flow diagnostic test, along with other sensor diagnostic tests, and Barometric (BARO) pressure.

PCM monitors MAP signal for voltages outside of normal range. If the PCM detects a MAP signal that is excessively less than calculated value, DTC P0108 will set.

When DTC sets, PCM illuminates MIL as soon as fault was detected. PCM will default to a BARO of 23.4 Hg (79.3 kPa). PCM will store conditions present when DTC was set as freeze frame data in the FAILURE RECORDS data.

PCM will turn MIL off on third consecutive trip cycle during which diagnostic runs and fault is no longer recognized. A history DTC P0106 will clear after 40 consecutive trip cycles during which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to PCM.