Briggs & Stratton VANGUARD M490000, Repair Manual

Page: 30 / 144

2
26
DTC P0112/P0113 MANIFOLD AIR TEMPERATURE (MAT) SENSOR
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.
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.
Not for
Reproduction