The function diagram for the MAP sensor includes the following:
• MAP sensor
• Electronic Control Module (ECM)
• Injector Drive Module (IDM)
• Exhaust Gas Recirculation (EGR)
• Variable Geometry Turbocharger (VGT)
• Fuel injector
• ENGINE lamp (amber)
Function
The MAP sensor is a variable capacitance sensor installed left of the MAT sensor in the intake manifold. The ECM supplies a 5 V reference signal which the MAP sensor uses to produce a linear analog voltage that indicates pressure. The ECM uses the MAP sensor signal to assist in the calculation of the EGR and VGT duty percentage. The ECM
monitors the MAP signal to determine intake manifold (boost) pressure. From this information the ECM can optimize control of fuel rate and injection timing for all engine operating conditions.
