2005-2007 Polaris Ranger 500 service manual, Page 143Get this manual
ELECTRONIC FUEL INJECTION NOTE: If the resistance reading is incorrect, remove the screws securing the sensor to the mounting bracket and replace the sensorIf the resistance in step was incorrect, but the resistance of the sensor alone was correct, test the main harness circuit between the sensor connector terminals and the corresponding pin terminals in the main connectorCorrect any observed problem, reconnect the sensor, and perform step again
MANIFOLD AIR PRESSURE SENSOR (MAP)
General Information
Mounted on the throttle body intake, the manifold air pressure sensor (MAP) measures air passing and provides the ECM with the manifold pressure during engine operationThis allows the ECM to adjust the fueling according to actual engine load as well as identify which stroke is the intake strokeThe MAP sensor also provides the ECM with the ability to compensate for high altitude operation without any recalibrationDuring initial start-up, the ECM is in "waste sparkwaste fuel" mode until the MAP sensor sends negative pressure reading, indicating that the engine is on the intake strokeOnce this has been learned', the ECM will then monitor the MAP sensor and cease the initial start-up program