PTO Electronic Operation
WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- During PTO operation, the powertrain control module (PCM) receives a 12-volt input signal from the PTO circuitry at pin 4. The PTO installer must provide this signal circuit. The PCM uses this signal to disable self diagnostics and to monitor powertrain operation during PTO usage.
- The PTO installer must provide an electronic throttle kicker that increase engine speed to 1,300 rpm during PTO operation.
- During PTO operation, the PCM turns ON the coast clutch solenoid (CCS). This allows engine power to be transmitted through the transmission input shaft to the PTO drive gear on the coast clutch cylinder.
- The PCM also operates shift solenoid SSB in the following manner during PTO operation:
- P, R or N: ON (OFF without PTO)
- First gear: OFF (OFF without PTO)
- Second gear: ON (ON without PTO)
- Third gear: ON (ON without PTO)
- PTO operation can cause transmission fluid temperature to exceed the recommend maximum limit of 121°C (250°F). The failure mode logic programmed in the PCM prevents transmission damage by disabling the PTO above this limit.