BLOCK-PORT 1997460 - Caterpillar

Probable Causes
Diagnostic codes
Event codes
Flash file
Power supply for the Electronic Control Module (ECM)
Starting circuit
Starting aids (if applicable)
Engine shutdown switches (if applicable)
Air shutoff system (if applicable)
Engine speed/timing
Unit injectors
Fuel supply
CombustionRecommended Actions
Diagnostic Codes, Event Codes, and ECM Power Supply
Certain diagnostic codes and/or event codes may prevent the engine from starting. Connect the Caterpillar Electronic Technician (ET) and check for active codes and/or for logged codes. Troubleshoot any codes that are present before continuing with this procedure.Note: If Cat ET will not communicate with the ECM, the problem is most likely with the electrical power supply to the ECM. Refer to diagnostic functional tests Troubleshooting, "Electrical Power Supply Circuit - Test".Starting Circuit
Test the operation of the starting motor solenoid.
Check the engine wiring to the starting motor solenoid.
Test the operation of the starting motor.
Inspect the starting motor pinion and the flywheel ring gear for damage.Flash File
Verify that the correct flash file has been flashed into the ECM. Refer to programming parameters Troubleshooting, "Flash Programming" for additional information.Starting Aids
Air Inlet Heater (if applicable)
Make sure that the air inlet heater is programmed to the On position. For additional information on the air inlet heater, refer to diagnostic functional tests Troubleshooting, "Air Inlet Heater Circuit - Test".Engine Shutdown Switches (If Applicable)
The engine shutdown switches should be in the OFF position. Use Cat ET to verify the status of the shutdown switches. When a shutdown occurs, the engine control must be in the OFF/RESET mode for at least 15 seconds before restarting the engine.Note: If Cat ET will not communicate with the ECM, the problem is most likely with the electrical power supply to the ECM. Refer to diagnostic functional tests Troubleshooting, "Electrical Power Supply Circuit - Test".Air Shutoff System (If Applicable)
Check the air shutoff mechanism. If an engine overspeed has occurred, the keyswitch must be cycled. There may be a manual reset for the air shutoff mechanism that is on the engine.Engine Speed/Timing
Crank the engine and observe the engine speed on the Cat ET status screen. If Cat ET indicates zero rpm, refer to diagnostic functional tests Troubleshooting, "Engine Speed/Timing Sensor Circuit - Test".Note: Upon initial cranking, the status for engine speed may indicate that the engine speed signal is abnormal. This message will be replaced with an engine speed once the ECM is able to calculate a speed from the signal.
Ensure that the timing reference gear is installed correctly. The engine will not start if the gear was installed backward. Check for proper orientation between the crankshaft and camshaft drive gears. Correct the orientation and/or replace the drive gear, if necessary. Refer to the Disassembly and Assembly manual for additional information.Unit Injectors
Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM. Refer to diagnostic functional tests Troubleshooting, "Injector Solenoid Circuit - Test" for additional information.Verify that the injection system is delivering the correct pressure. Refer to diagnostic functional tests Troubleshooting, "Injection Actuation Pressure - Test" for additional information.Fuel Supply
Visually check the fuel