SHAFT-IDLER 1129951 - Caterpillar

Conditions Which Generate This Code:The Electronic Control Module (ECM) detects all of the following conditions:
The ECM has been powered for at least 3 seconds.
A signal voltage for the throttle position is below the diagnostic lower limit that is set for the application.
The power supply for the throttle sensor is within the expected range.System Response:If equipped, the warning light will come on. The ECM logs the diagnostic code if the engine is running.If a second throttle is installed, the engine will use the second throttle until the fault is repaired.If a second throttle is not installed or if the second throttle has a fault, the following conditions will occur:
The engine will default to the limp home speed.
If the engine speed is higher than the limp home speed, the engine will decelerate to the limp home speed.
If the engine speed is lower than the limp home speed, the engine speed will remain at the current speed.
The engine will remain at this speed while the diagnostic code remains active.
All inputs from the faulty throttle are ignored by the ECM until the fault is repaired.
All inputs from the repaired throttle will be ignored by the ECM until the keyswitch has been turned to the OFF position and then back to the ON position.Monitor the configuration screen on the electronic service tool in order to determine the type of throttle position sensor that is used on the engine.If the engine is equipped with an analog throttle position sensor, proceed to "Test Step 1".If the engine is equipped with a digital throttle position sensor, proceed to "Test Step 2".Test Step 1. Perform the following diagnostic procedure: Analog Throttle Position Sensor Circuit - TestResults:
OK - STOPTest Step 2. Perform the following diagnostic procedure: Digital Throttle Position Sensor Circuit - TestResults:
OK - STOP