fault code 1239 Acc Pedal or Lever Position Sensor 2 Circuit - 05 Int ISX 400 cummins

Double check the model year, this engine should be a CM871 if it is generating that code. CM870 were still around in 05 and had different throttle pedal wiring. For the 871 model, the throttle pedal has actually two separate position sensors in it. #1 and #2. #2 is always exactly 1/2 the voltage signal of #1 so the ECM can verify it is getting a valid signal. The signal return is higher than normal. This is normally a shorted pedal position sensor. If you unplug it you should get 1241 active. If you do, replace the pedal sensor.

 

I am getting real sick of this cold weather! Mosquitoes and humidity any time now!!! The sensor is part of pedal, two small screws hold it on. I can't remember if the plug is right at the sensor at the pedal, or if the sensor has the harness attached to it, and the plug in hiding up inside the kick panel. It is tight down there, but if the connector is at the sensor you should be able to unplug it there.

 

@Heavyd ....please help with 2011 prostar shut down coz accerelator pedal sensor fault. i replaced new pedal but still getting alarm code. thanks

 

Do you have the actual fault code number?

 

I think its 132. i cleaned the pedal module and problem seem to disapear but now its back again.

 

1242 or 132

 

If you have a 9000 series International the main engine harness is famous for rubbing through anywhere between the firewall plug to the engine. This harness is usually ziptied to the firewall over the turbo and runs overtop the rear of the valve cover and along the left side of the engine to the ECM. Cut all the zip ties and inspect this harness for chaffing. The harness is usually coiled over the turbo somewhere and the wiring will rub at sharp bends. I have also seen the loom look perfect on the outside, but chew into the wires on the inside to the point the insulation is worn away then the copper wire inside becomes exposed to air and moisture and corrodes. So I recommend to open this harness up all the way paying close attention to areas with bends or curves. Throttle wires will be purple in colour. Also check the firewall connector for any green/corroded or partially pulled out terminals.