Briggs & Stratton VANGUARD 810 EFI Repair Manual page 29

Section 2: Troubleshooting DTCs
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 termi-
nals, and poor terminal to wire connection.
3
4
TAN/BLACK
BROWN
J2 10 J2 08
5 Volt MAT
Sensor
Return
Signal
Signal Voltage Low, High or Open
MAT/MAP
Sensor
2 1
WHITE/RED
RED/WHITE
J2 16
J2 11
5 Volt
MAP
Reference
Sensor
Signal
3. Damaged wire harness and/or connec-
tors. If harness appears to be OK, shake or
wiggle wire harness and/or connector with
DVOM or ETA 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.
ECM
25