RING 7F8658 - Caterpillar

This procedure covers the following diagnostic codes:
Table 1
Diagnostic Trouble Codes for the Idle Validation Switches
J1939 Code CDL Code Code Description Comments
558-2 1634-2 Accelerator Pedal 1 Low Idle Switch : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) detects the following condition:
The signal from the Idle Validation Switch (IVS) is invalid.
If equipped, the warning light will come on. The ECM will log the diagnostic code.
2970-2 774-0 Accelerator Pedal 2 Low Idle Switch : Erratic, Intermittent, or Incorrect
Follow the troubleshooting procedure to identify the root cause of the fault. If the application is equipped with two throttles, 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 limp home mode.
If the engine speed is higher than the speed in limp home mode, the engine will decelerate to limp home mode.
If the engine speed is lower than the speed in limp home mode, 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 cycled.The IVS may be installed. The IVS is required for mobile applications with an analog throttle installed. The IVS is part of the throttle position sensor. The IVS is CLOSED when the low idle is set.The configuration parameters for the throttle and for the IVS thresholds are programmed into the ECM. Use