ELBOW-FLARED 9S7703 - Caterpillar

The probable root causes are listed in order below:
Electrical power supply
Low fuel level
Starting aids
Shutdown switch
Active engine shutdown
Electrical connectors
Circuit breakers
Personality Module
Engine Speed/Timing sensor
Injector solenoid
Fuel supplyPerform the following tests in order:
Measure the voltage at the ECM connector J1-23. If the ECM is not receiving battery voltage the ECM will not power up. Refer to Troubleshooting, "Electrical Power Supply".
Visually check fuel level. If necessary, add fuel.
If cold ambient conditions exist, check operation of starting aids. Replace the ether canister if the ether is low. Ensure the proper operation of the Jacket Water Heater. Repair the Jacket Water Heater and/or replace the Jacket Water Heater. Check for presence of solidified fuel (wax).
The shutdown switch should be in the OFF position. Connect the ET. Use the ET in order to verify the status of the shutdown switch. If the ET will not communicate with the ECM, refer to Troubleshooting, "Electronic Service Tool Will Not Communicate With ECM". When a shutdown occurs, the ECS must be turned to the OFF/RESET position. The ECS must then be turned to the START position before the engine will start. Refer to Troubleshooting, "Emergency Stop Switch".
Use the ET to determine if any active shutdowns are present. If a Shutdown is Active, determine the reason. After you correct the problem, turn the ECS to the OFF/RESET position for at least 15 seconds before you try to restart the engine.
Check for correct installation of the ECM connectors J1/P1, J2/P2, Engine Speed/Timing Sensor J20/P20 and Unit Injector connectors J4/P4 through J19/P19. Refer to Troubleshooting, "Inspecting Electrical Connectors".
The circuit breakers may exceed the trip point due to overheating. Check the circuit breakers. Reset the circuit breakers if the circuit breakers are tripped.
The diagnostic code 253-02 should not be present. If the diagnostic code is present, refer to Troubleshooting, "Programming Parameters".
Crank the engine. Observe the engine rpm on the ET. If the ET indicates 0 rpm, refer to troubleshooting, "Engine Speed/Timing Sensor".
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. Refer to Disassembly and Assembly Manual.
Perform the Injector Solenoid Test. Verify that the ECM is energizing all the injector solenoids. Refer to Troubleshooting, "Injector Solenoids".
Check the fuel system, if there is no smoke at the exhaust. Check fuel lines for the following problems: restrictions, collapse and pinched line. Repair the lines and/or replace the lines. Refer to the Systems Operation, "Fuel System".
Check the fuel tank for foreign objects which may block the fuel supply. Check for air in the low pressure fuel supply system after you perform the following procedures:
Replacing the fuel filters
Working on the low pressure fuel supply circuit
Replacing unit injectors
Purge air from the low pressure fuel supply circuit with the hand priming pump and by cranking the engine in 30 second cycles. After you crank the engine, stop for two minutes. This will allow the starting motor to cool. Loosen the