Throttle Commander Troubleshooting

If you are experiencing any of the problems listed below, simply click on the item to view possible causes and the corrective action you can take.

Engine RPM climbs to red line when Throttle Commander is activated.

Possible Cause
Clear tipped or white wire not connected properly.

Throttle Commander adjusted incorrectly.

RPM knob turned fully clockwise.

Corrective Action
Check connections.

Turn the adjustment screw RPM1 for SPEED1 or RPM2 for SPEED2 counter-clockwise (up to 20 turns) until RPM comes down.

Turn RPM knob counter-clockwise.

Engine stays at base idle (600 RPM) and accelerator pedal continues to have authority over engine speed.

Possible Cause
Red and/or Purple wires not receiving 12V.

Park brake not on.

Black wire not connected properly, if automatic transmission, DDC not connected properly.

Corrective Action
Check supply of 12V to red and/or purple wires.

Set park brake.

With park brake on, check electrical continuity from black wire to chassis ground. If no continuity, check connection of black wire to park brake switch. If connection is good but still no continuity to ground, replace park brake switch.

Engine stays at base idle (600 RPM) and accelerator pedal does not have authority over engine speed.

Possible Cause
Throttle Commander adjusted incorrectly.

Corrective Action
Turn adjustment screw clockwise (as many as 20 turns may be necessary) until RPM comes up to desired level.

Engine RPM will not adjust below 1200 RPM

Possible Cause
Proper operation of Throttle Commander being disrupted by PTO circuit.

Corrective Action
Disconnect all wires running to Ford CCT 322 (blue/yellow wire near data link connector at lower center of dash).

Engine stays at pre-set RPM even with Throttle Commander switched off.

Possible Cause
Proper operation of Throttle Commander being overridden by PTO circuit.

Corrective Action
Disconnect all wires running to Ford CCT 322 (blue/yellow wire near data link connector at lower center of dash).

“Check Engine” light comes on.

Possible Cause
Bad plug connection at the Throttle Commander or foot pedal assembly.

Corrective Action
Make sure all plugs are properly engaged and fully seated and latched.