3512B Petroleum Engines with the ADEM 2 Electronic Control Module Caterpillar

• Active engine shutdown

• Fuel supply

• Air shutoff is closed.

• Cranking speed

• Electrical connectors

• Engine speed/timing sensor

• Personality Module

• Combustion

• Starting aids

• Prelube

• Fuel Position Multiplier

Perform the following checks:

1. Use the Caterpillar Electronic Technician (ET) to determine if any active shutdowns are present. If a shutdown is active, determine the reason. After you correct the problem, turn the keyswitch to the OFF position for at least 15 seconds before you try to restart the engine. Check that the Emergency Stop Switch is not active. Refer to the diagnostic functional test Troubleshooting, "Emergency Stop Switch".

2. 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. Check for presence of solidified fuel (wax).

   1. Check the fuel system, if there is no smoke at the exhaust. Check fuel lines for the following problems: restrictions, collapse, pinched line and loose fittings. Repair the lines and/or replace the lines. Refer to the Testing and Adjusting, "Fuel System Inspection".

   2. 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 fuel injectors

   3. 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 vent plug for the fuel return line. The plug is located on the rear upper left side of the engine block. Hand prime the engine again if air in fuel continues. A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel.

   4. Check fuel quality. In temperatures below 0 °C (32 °F), check for solidified fuel (wax). Refer to Special Publication, SEBD0717, "Diesel Fuels And Your Engine". Check the fuel pressure while the engine is cranking. Check the fuel pressure at the filter. Refer to Testing and Adjusting, "Fuel Pressure". If pressure is low, check for plugged fuel filters. If the fuel pressure is still low, check the following items: fuel transfer pump, fuel transfer pump coupling and fuel pressure regulating valve. Check for a problem with the combustion system.

3. Check that both of the Air Shutoffs are open and that both of the Air Shutoffs are in the starting position.

4. Check the cranking speed of the starter. Refer to Testing and Adjusting, "General Information (Air/Electric Starting System)" for air starting systems or refer to Testing and Adjusting, "Electric Starting System" for electric starting systems.

5. Check for correct installation of the connectors for the Electronic Control Module (ECM) J1/P1, J2/P2, Engine Speed/Timing Sensor J20/P20 and Fuel Injector connectors J4/P4 through J19/P19. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".

6. Crank the engine and observe the engine speed on the Cat ET Status screen. If the Cat ET status screen indicates 0 rpm, refer to the diagnostic functional test Troubleshooting, "Engine Speed/Timing Sensor". If the engine speed is greater than 50 rpm, then there is not a problem with the engine speed/timing sensors or with the circuit.

7. The diagnostic code 253-02 should not be present. If the diagnostic code is present, refer to the diagnostic procedure Troubleshooting, "Programming Parameters".

8. Check for a combustion problem.

9. If cold or ambient conditions are present, check the operation of the starting aids.

10. Allow the engine to complete the prelube cycle.

11. Refer to the diagnostic functional test Troubleshooting, "Fuel Position Multiplier".