Circuit Function
The PTO system provides an input signal to the powertrain control module (PCM) indicating there is an additional load being applied to the engine. The PCM disables the on-board diagnostic (OBD) monitors and increases the engine RPM based on the PTO system or auxiliary idle control input.
The following entry conditions are required to enable the PTO or auxiliary idle control:
- accelerator pedal released
- automatic transmission in PARK or manual transmission in NEUTRAL with the clutch pedal released
- brake pedal released
- engine at normal operating temperature
- parking brake applied
CAUTION:
The PCM harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no start condition. Installing the PCM connectors on an angle may cause an improper connection, misdiagnosis, and damaged components. Install the connector until the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM and then fully seat the connector.
NOTE:
Visually inspect the harness connectors for corrosion, damage, proper mating, and correct pin tension.