Circuit Description

WARNING: This page is about a different car, the 2002 Isuzu Trooper. 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. MAP sensor is used to determine manifold pressure changes while linear Exhaust Gas Recirculation (EGR) flow test diagnostic is being run, see DTC P0401: EXHAUST GAS RECIRCULATION FLOW INSUFFICIENT . MAP also determines engine vacuum level for some other diagnostics and Barometric (BARO) pressure. PCM compares 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 more than or less than calculated value, DTC P0106 will set.

When DTC sets, PCM illuminates MIL on second trip after 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.