2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 166Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 166

500 EFI FUEL SYSTEM Idle Air Control Replacement 1Disconnect the IAC from the engine harness2Using suitable tool, remove
varying the voltage signal to the ECU in direct correlation to the angle of the throttle plateThis signal is processed by
the ECU and compared to the internal pre-programmed maps to determine the required fuel and ignition settings for the amount
of engine load IAC Retaining Screws: 17.7 inlbs(2 0.5 Nm) Throttle Position Sensor Test The throttle position sensor (TPS)
is non-serviceable itemIf it is faulty, it must be replacedIt can be tested using the following method: Using an ohmmeter1With
the test leads connected and the meter set to the ohms scale, observe the reading at the following pin locations of the TPS:
Table 4-1: TPS Resistance Readings Throttle Position to GND 1-2 Closed 1-2 Open 1-3 Pin Resistance 4K (reference) 820 (reference)