BUSHING 1633753 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the following diagnostic codes:
323-3 Engine Shutdown Lamp voltage above normal
324-3 Warning Lamp (Action) voltage above normal
444-3 Starter Motor Relay voltage above normal
445-3 Run Relay voltage above normalThe Electronic Control Module (ECM) has the following four outputs that are used to indicate the status of engine operation:
Engine control alarm status
Run relay
Crank terminate relay
Fault relayThese outputs can be used to energize indicator lamps or the outputs can be used to interface with other controls.The ECM opens an internal circuit in order to turn off an output. The ECM closes the circuit in order to turn on an output. When the circuit is closed and the output is turned on, the ECM allows a maximum current of 0.3 amperes to flow through the circuit to a ground that is inside the ECM.If excessive current flows through the circuit, a diagnostic code is generated. A short circuit to the +Battery side will also activate a diagnostic code. "Crank Terminate Relay" - This output indicates that the engine rpm is greater than the programmed engine speed that is required for disengagement of the starting motor. While this output is energized, a short circuit to a positive voltage source or excessive current through the circuit will cause a diagnostic code to become activated. The ECM cannot diagnose this output while the output is off."Engine Control Alarm Status" - This is the alarm output. This output indicates that the ECM has detected an electrical problem or an abnormal operating condition. While this output is energized, a short circuit to a positive voltage source or excessive current through the circuit will cause a diagnostic code to become activated. The ECM cannot diagnose this output while the output is off."Fault Relay" - This is the shutdown output. This output indicates that a potentially damaging operating condition was detected by the ECM. The ECM has shut down the engine. While this output is energized, a short circuit to a positive voltage source or excessive current through the circuit will cause a diagnostic code to become activated. The ECM cannot diagnose this output while the output is off."Run Relay" - This output indicates that the engine is in the "Run" status. The engine will start soon or the engine is running. While this output is energized, a short circuit to a positive voltage source or excessive current through the circuit will cause a diagnostic code to become activated. The ECM cannot diagnose this output while the output is off.A 323-3 or 324-3 diagnostic code can only be generated if a shutdown condition or an alarm condition is active. Failure to correct these serious conditions can result in engine damage.Determine the event code or the diagnostic code that corresponds to the 323-3 or 324-3 diagnostic code. Troubleshoot that event code or that diagnostic code before you troubleshoot the 323-3 or 324-3 diagnostic code. Refer to Troubleshooting, "Troubleshooting with an Event Code" or Troubleshooting, "Troubleshooting with a Diagnostic Code".The most likely causes of a