Dtc P0122/P0123 Throttle Position Sensor (Tps); Circuit Description; Diagnostic Aids - Briggs & Stratton VANGUARD M490000 Repair Manual

DTC P0122/P0123 THROTTLE POSITION SENSOR (TPS)

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Circuit Description

The TPS is a potentiometer connected to the throttle shaft
on the throttle body. The ECM calculates throttle position
by monitoring voltage on the signal circuit. As the throttle
angle changes, the TPS signal also changes. At a closed
throttle position, the voltage output of the TPS is low, but
as the throttle opens, the voltage output increases.

Diagnostic Aids

Check for the following conditions:
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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 ETA connected. Radical
voltage changes or a change in the TPS display can
indicate the location of the fault condition.
Always clear DTCs after performing repairs.