SEAL GROUP 1N3216 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with the starting system.The ECM is provided with the ability to begin the engine cranking at any time after the ECM has received keyswitch power. The ECM receives the start command via the global CAN data link. If the engine is equipped with a prelubrication system, the engine will wait until the prelube cycle has been completed before initiating engine cranking.Configuration ParametersThe settings of the following configuration parameters control engine cranking:
Starting System #1 Maximum Number of Crank Cycles
Starting System #1 Crank Cycle Rest Interval
Starting System #1 Crank Duration
Crank Terminate RPMFor details on these parameters, refer to Systems Operation/Testing and Adjusting, "Electronic Control System Parameters".ECM Activation of the Starting MotorsThe ECM energizes a relay that controls a battery supply to the starting motors.Current is supplied by the ECM to the relay, through the normally open contacts of the relay.Manual Activation of the Starting Motors (Override Control)The engine can be manually cranked by using a manual crank switch that can be wired into the engine interface connector. Switching this input to +Battery will energize the starter relay.Caterpillar Electronic Technician (ET) can be used to override the ECM output to the start solenoid valve. The override energizes the solenoid valve. View the "Starting System Relay Status" that is available in Cat ET to determine the status of the ECM output.