DOWEL 2A3798 - Caterpillar

System Operation Description:Digital inputs are used to bring on/off information, such as switch closures, to the generator set control. Depending on how the input is programmed, the EMCP 3 associates the inputs with levels, temperatures, pressures, and status conditions. Two of the digital inputs, which are programmed at the factory, are used by the EMCP 3 to control emergency stop and remote initiate functions. The spare digital inputs must be programmed before use.For additional information on programming digital inputs, Refer to System Operation, RENR7902, "Digital Input Programming"The code is generated when the digital input is active. The code may indicate that a problem exists with the generator set. The code may also indicate a status which requires no repairs.Test Step 1. PERFORM THE INITIAL CHECK.
Use Cat ET in order to check for active diagnostic codes on the engine ECM. If any codes are present, first correct the problem that caused the diagnostic codes. Expected Result:No other diagnostic codes or indicators are active on the engine ECM.Results:
OK - No other diagnostic codes or indicators are active. Proceed to Test Step 2.
NOT OK - Another engine ECM diagnostic code is active.Repair: Exit the procedure. Troubleshoot the active code or indicator. Refer to the engine troubleshooting manual for your particular generator set.STOPTest Step 2. CHECK THE SET POINTS.
View the digital input set points. Make a note of the set points. Refer to Testing and Adjusting, RENR7902, "Electronic Control Module (Generator Set) - Configure". Compare the set points against the default set points of the particular generator set.Expected Result:The set points are correct.Results:
OK - The set points are correct for your particular generator set. Proceed to Test Step 3.
NOT OK - The setpoints are NOT correct.Repair: Reprogram the set points. Reset the generator set. Resume normal operation and verify that the problem has been corrected.STOPTest Step 3. CHECK THE DIGITAL INPUT WIRING.
Check the wiring to the corresponding digital inputs for an unwanted short circuit. The short can be to the battery negative ("B-"). Carefully check ALL wires that are connected to the appropriate digital input for abrasion or worn spots in the insulation. Any abrasion or worn spots could cause a short. Check the wires in the generator control panel. Check the wires in the engine harness. Refer to the appropriate wiring diagrams for the circuit that is being checked.Expected Result:The wiring is correct.Results:
OK - No problems can be found with the digital input wiring. Proceed to Test Step 4.
NOT OK - The digital input wiring is defective.Repair: Repair the wiring or replace the wiring. Proceed to Test Step 4.Test Step 4. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the harness connectors and clean the contacts of the machine harness connectors.
Reconnect all harness connectors.
Reset the generator set.
Operate the generator set.
Check the status of the diagnostic code.Expected Result:The diagnostic code is not active.Results:
OK - The diagnostic code is not active. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor connection or a short at