Dtc P0107/P0108 Manifold Absolute Pressure (Map) Sensor; Circuit Description; Diagnostic Aids - Briggs & Stratton VANGUARD M490000 Repair Manual

DTC P0107/P0108 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR

2

Circuit Description

The MAP sensor responds to changes in manifold
pressure (vacuum). The ECM receives this information as
a signal voltage that varies between about 0.5 volts at idle
to 4.5 volts at Wide Open Throttle (WOT).
If the MAP sensor fails, the ECM substitutes a default
MAP value.
The MAP sensor voltage of 5 volts is delivered to the
MAP sensor through ECM terminal J2-16. The MAP
sensor sends a voltage signal back to the ECM on
terminal J2-11 according to the manifold pressure value
on the terminal.
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Diagnostic Aids

Check for the following conditions:
1. Poor ECM connection. Inspect wire harness
connectors for backed out terminals, improper
mating, broken locks, improperly formed or damaged
terminals, and poor terminal to wire connection.
2. Damaged wire harness and/or connectors. If harness
appears to be OK, shake or wiggle wire harness
and/or connector with DVOM or Diagnostic Tool
connected. Radical voltage changes or a change in
the MAP sensor display can indicate the location of
the fault condition.
Always clear DTCs after performing repairs.