RING-RETAINING 6P7983 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the throttle actuator. Also use this procedure if one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
1440-9 Throttle Actuator : Abnormal Update Rate The Electronic Control Module (ECM) has lost the last four messages that were expected from the throttle actuator over the CAN data link. The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
1440-12 Throttle Actuator : Failure The throttle actuator has reported that an internal fault has occurred. The throttle actuator works with the engine ECM in order to ensure the correct throttle position during all engine operating conditions.The ECM controls the throttle from a fully closed position to a fully opened position.CommunicationsThe ECM and the throttle actuator communicate via the CAN data link. The ECM sends a command signal to the actuator. The actuator sends the following information to the ECM:
Actuator position
Heartbeat signal
Software version
Internal fault diagnosisIf the ECM cannot communicate with the actuator, the ECM activates a 1440-9 diagnostic code and the engine is shut down. A 1440-9 diagnostic code is probably caused by a problem with an electrical connector or a harness. The next likely cause is a problem with the actuator or a problem with the power circuit for the actuator. The least likely cause is a problem with the ECM. After checking the power circuit for the actuator, refer to Troubleshooting, "CAN Data Link - Test" for information that is related to troubleshooting the 1440-9 diagnostic code.Self-diagnostic FunctionIf an internal fault is detected by the actuator, the condition is communicated via the CAN data link. The ECM activates a 1440-12 diagnostic code and the engine is shut down. The most likely cause of a 1440-12 diagnostic code is a problem with the actuator.
Illustration 1 g02148074
Schematic for the circuit of the throttle actuator
Test Step 1. Inspect the Electrical Connectors and the Wiring
Set the engine control switch to the OFF/RESET position. Remove the electrical power from the engine.
Illustration 2 g01767615
Location of the throttle actuator (right side engine view)
(1) Throttle actuator