COVER 2389850 - Caterpillar

The following procedure describes the adjustments that are required if an engine speed-timing calibration is performed. After this procedure has been completed, the engine can be started and the engine can be run at rated speed.Note: This procedure does not include the instructions for performing the actual calibration.Note: Before changing any value per this procedure, record the original value.
Stop the engine.
If a device such as a load share module is supplying the PWM signal in order to bias the engine speed, then disconnect the wires from the device. Go to Step 4. If there is not a device that is supplying the PWM signal and the engine speed bias is controlled from the EMCP 4, then go to Step 3.
Use the EMCP 4 control panel in order to idle the engine. Refer to the information for the idle speed and rated speed that is in the System Operation, "Voltage and Frequency Adjustment" section of this publication. Proceed to Step 5.
Set the "Engine Start Fault Protection Activation Delay Time" setpoint in the EMCP 4 to 90 seconds. Use Cat ET in order to set the "Secondary Desired Speed Input Configuration" set point in the engine ECM to "DISABLED".
Start the engine and run the engine at idle speed.
Perform the engine speed timing calibration.
Stop the engine.
Use Cat ET in order to return the set points that were modified in Step 2 through Step 4 to the original values. Navigate to the "Control" screen. Next, proceed to the "Rated" screen.
Reconnect any wires that were disconnected in Step 2.