Map Sensor (Manifold Absolute Pressure) - Navistar International DT 466 Diagnostic/Troubleshooting Manual

500 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

MAP Sensor (Manifold Absolute Pressure)

Figure 483 Function diagram for the MAP sensor
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)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
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 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.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
The ECM uses