Dtc P0112/P0113 Manifold Air Temperature (Mat) Sensor; Circuit Description; Diagnostic Aids - Briggs & Stratton VANGUARD M490000 Repair Manual

DTC P0112/P0113 MANIFOLD AIR TEMPERATURE (MAT) SENSOR

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Circuit Description

The MAT sensor uses a thermistor to control signal
voltage to the ECM. The ECM applies 5 volts on the
sensor circuit. Sensor resistance changes as ambient
temperature changes, which in turn affects the voltage
return to the ECM.

Diagnostic Aids

Check for the following conditions:
1. Poor ECM connection.
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2. Inspect wire harness connectors for backed out
terminals, improper mating, broken locks, improperly
formed or damaged terminals, and poor terminal to
wire connection.
3. 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 MAT sensor display can indicate the location of
the fault condition.
Always clear DTCs after performing repairs.