PIN 2G8610 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the throttle position sensor. Also, use this procedure if one of the diagnostic codes in Table 1 is active.
Table 1
Diagnostic Trouble Codes
J1939 Code and Description Conditions that Generate the Code System Response
29-2 Accelerator Pedal Position 2 : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) detects an erratic signal in the circuit for the #2 throttle position sensor. The code is logged.
29-3 Accelerator Pedal Position 2 : Voltage Above Normal The ECM detects a voltage that is above normal in the circuit for the #2 throttle position sensor. The code is logged.
29-4 Accelerator Pedal Position 2 : Voltage Below Normal The ECM detects a voltage that is below normal in the circuit for the #2 throttle position sensor. The code is logged.
29-8 Accelerator Pedal Position 2 : Abnormal Frequency, Pulse Width, or Period The ECM detects an incorrect frequency or an incorrect duty cycle in the circuit for the #2 throttle signal. The engine speed is limited to low idle.
The code is logged.
91-2 Accelerator Pedal Position 1 : Erratic, Intermittent, or Incorrect The ECM detects an erratic signal in the circuit for the #1 throttle position sensor. The code is logged.
91-3 Throttle Position Sensor : Voltage Above Normal The ECM detects a voltage that is above normal in the circuit for the #1 throttle position sensor. The code is logged.
91-4 Throttle Position Sensor : Voltage Below Normal The ECM detects a voltage that is below normal in the circuit for the #1 throttle position sensor. The code is logged.
91-8 Throttle Position Sensor : Abnormal Frequency, Pulse Width, or Period The ECM detects an incorrect frequency or an incorrect duty cycle in the circuit for the #1 throttle signal. The engine speed is limited to low idle.
The code is logged. The throttle position sensors provide the throttle signal to the ECM.Each throttle position sensor allows the operator to control the speed of the engine. The geometry of the throttle assembly controls both the travel of the sensor and the range of the output signal. The throttle position sensors cannot be adjusted.The ECM recognizes the signal from the throttle position sensor according to the strategy that is set up in the configuration parameters. Refer to Troubleshooting, "Configuration Parameters" for details that relate to the current throttle strategy settings.The output from the throttle position sensor is a PWM signal that varies with the position of the throttle assembly. The throttle position sensor produces a minimum duty cycle in the released position and a maximum duty cycle in the fully actuated position. When the sensor is released, the ECM translates the sensor output signal to a throttle position of 0 percent. When the sensor is fully actuated, the ECM translates the output signal to a throttle position of 100 percent.The throttle position sensor is powered by 8.0 0.4 VDC that is provided by the ECM. A digital return for the sensor is also provided