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Power Take-Off Switch

The Power Take-Off (PTO) circuit is used by Powertrain Control Module (PCM) to disable some of the OBD-II monitors during PTO operation. The PTO switch is normally open and circuit voltage is normally low. When PTO switch is closed, battery voltage is supplied to PTO circuit, indicating an additional load condition to PCM. If an additional load condition is not reported to PCM by PTO circuit, a false DTC may be stored.