SEAL-O-RING 0951658 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use this procedure if any of the following diagnostic codes are indicated:
30-08 (29)
30-13 (29)Also, use this procedure if the remote accelerator position sensor is suspected of improper operation.Remote Accelerator Position SensorA remote accelerator position sensor may be used for PTO purposes. The remote accelerator position sensor should be connected to J1/P1:68. Before the Engine Control Module (ECM) will respond to the remote accelerator position sensor, the ECM "PTO Configuration" must be programmed to "Remote Throttle", and the "PTO On/Off Switch" must be in the ON position. Also,Caterpillar offers the following recommendation:
The remote accelerator position sensor must be powered from the vehicle battery (+12 V).Therefore, the +12 V version of the accelerator position sensor must be used for the remote accelerator position sensor, and the +8 V version for the accelerator pedal position sensor in the cab.The ECM will not respond to the remote accelerator position sensor if 253-02 diagnostic code is active under some conditions. Refer to Troubleshooting, "ECM Memory - Test" if 253-02 diagnostic code is active.The remote accelerator position sensor is used to provide a throttle position signal to the ECM. Sensor output is a constant frequency signal with a pulse width that varies with the pedal position. This output signal is referred to as either a duty cycle or a pulse width modulated signal (PWM) and this output signal is expressed as a percentage between 3 and 100 percent.The accelerator position sensor in the cab is attached directly to the accelerator pedal assembly and the sensor requires no adjustment.The accelerator position sensor will produce a duty cycle of 10 to 22 percent at low idle and 75 to 90 percent when the accelerator pedal is fully depressed. The percent of duty cycle is translated in the ECM into an accelerator pedal position of 3 to 100 percent.The accelerator position sensor can be replaced separately from the pedal assembly. An incorrectly calibrated pedal assembly can not be adjusted. The entire pedal assembly must be replaced.If the vehicle is using the ECM dedicated PTO functions, the accelerator position sensor will be ignored while the engine is in "PTO Mode" and the "PTO Configuration" is programmed to the following setting:
"Remote Throttle"The ECM is in "PTO Mode" if the PTO on/off switch is on. This can be checked through the status screen on Caterpillar Electronic Technician (ET).The ECM will not respond to the remote accelerator position sensor when both of the following conditions are met:
The PTO on/off circuit is switched from the OFF position to the ON position.
The ECM reads the remote accelerator position sensor above low idle.This prevents the engine from experiencing unexpected acceleration or sudden acceleration when the PTO on/off circuit is turned on. The remote accelerator position sensor must return to low idle before the ECM will respond. The ECM must also see a transition from the OFF position to the ON position in the PTO on/off switch in order to allow the other PTO speed control functions