BEARING 4708023 - Caterpillar

Table 1
Diagnostic Codes Table    
Code and Description    Conditions which Generate this Code    System Response    
91-13 Throttle Position Sensor calibration required     The duty cycle for the throttle position sensor signal is less than 5 percent or more than 95 percent.     The Electronic Control Module (ECM) sets the desired engine speed to programmed low idle while this diagnostic code is active. Caterpillar Electronic Technician (ET) will indicate a throttle position of 0 percent while this diagnostic code is active.    There are two options for calibrating the throttle position sensor:Mechanical Calibration - During a manual calibration, two set screws on the throttle position sensor are adjusted. The set screws are for low idle stop and high idle stop.Electronic Calibration - During an electronic calibration, the Caterpillar Electronic Technician (ET) is used to set the PWM that is equal to low idle and the PWM that is equal to high idle.
Check the Throttle Linkage for Damage.
Remove the electrical power from the ECM.
Inspect the throttle linkage for components with the following conditions:
Loose
Bent
Broken
Missing
WornRepair any damaged components.
Mechanical Calibration at Low Idle
Connect Cat ET to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Restore the electrical power to the ECM. Do not start the engine.
Observe the value of the "Throttle Position" on Cat ET.
Move the throttle to low idle. Adjust the throttle linkage and adjust the low idle set screw until the "Throttle Position" is 0 percent.
Increase the throttle. Verify that the value of the "Throttle Position" increases.Note: When the throttle is in the low idle position, the duty cycle of the throttle position sensor is 5 to 10 percent. The ECM converts this duty cycle of 5 to 10 percent into a throttle position of 0 percent.
Mechanical