C-10 and C-15 Petroleum Engines Caterpillar

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The connection of any electrical equipment and the disconnection of any electrical equipment may cause an explosion hazard which may result in injury or death. Do not connect any electrical equipment or disconnect any electrical equipment in an explosive atmosphere.

Probable Causes

• ECM personality module

• Electrical power to the Electronic Control Module (ECM)

• Remote shutdown switch

• Air shutoff circuit

• Starting motor solenoid or starting circuit

• Engine speed/timing sensors

• Electrical connections to the electronic unit injector

• Fuel supply

• Combustion problem

Recommended Actions

ECM Personality Module

If a new ECM has been installed on the engine, the engine will not start. The ECM will not communicate with the Caterpillar Electronic Technician (ET) until the correct personality module has been flashed into the ECM.

1. Verify that the following diagnostic is not active.
   • 253-02 Personality Module mismatch

   If the code is active, access the "Winflash" and flash the correct version of the software.

Electrical Power to the ECM

1. Turn the keyswitch OFF.

2. Check the positive battery and negative battery connections to the ECM.

3. Perform a pull test on positive battery wires and negative battery wires.

4. Check the negative battery connection on the ground stud.

5. Turn the keyswitch ON.

6. The warning lamps should illuminate for five seconds.

If the warning lamp illuminates for five seconds, continue with this procedure.

If the warning lamp does not illuminate for five seconds, refer to the diagnostic functional test Troubleshooting, "Electrical Power Supply Circuit - Test".

Remote Shutdown Switch

Access the screen on Cat ET that displays the remote shutdown switch status. The remote shutdown switch status on Cat ET is called "User Shutdown".

If the voltage is not in the proper range, refer to the diagnostic functional test Troubleshooting, "Switch Circuits - Test".

Air Shutoff Circuit

Refer to the diagnostic functional test Troubleshooting, "Air Shutoff System - Test" for additional information.

Starting Motor Solenoid or Starting Circuit

1. Test the operation of the starting motor solenoid.

2. Check the engine wiring to the starting motor solenoid.

3. Test the operation of the starting motor.

4. Inspect the starter motor pinion and the flywheel ring gear for damage.

Engine Speed/Timing Sensors

Observe the engine speed on Cat ET while the engine is being cranked.

This situation may require a direct hookup to the batteries in order to power Cat ET while the engine is cranking. Refer to Illustration 1 for the wiring diagram.

Illustration 1	g00781203

If the engine is cranking and Cat ET displays 0 rpm, a problem exists in the circuits for the engine speed/timing sensors. Refer to the diagnostic functional test Troubleshooting, "Engine Speed/Timing Sensor Circuit - Test".

If an engine speed is present, check the sensor installation. If the sensor is not properly installed, the ECM may read engine speed, but the ECM cannot determine the tooth pattern. The ability for the ECM to read the tooth pattern is necessary to determine the cylinder position. Engine speed is present when engine speed is greater than 50 rpm. Refer to the diagnostic functional test Troubleshooting, "Engine Speed/Timing Sensor Circuit - Test".

Electrical connections to the electronic unit injector

1. Ensure that the electronic unit injector connector (J300/P300) is fully connected and free of corrosion.

2. Check for logged diagnostic codes that are related to the cylinder. Refer to the diagnostic functional test Troubleshooting, "Injector Solenoid Circuit - Test" if diagnostic codes that are related to the cylinder are present.

Check the Fuel Supply

1. Check the fuel level.

2. Monitor the exhaust for smoke while the engine is being cranked.

   If no smoke is present, there may be a problem with the fuel quality or there may be a problem with the fuel supply.

3. Check the fuel pressure. Refer to Testing and Adjusting, "Fuel System Pressure - Test".

4. Ensure that the fuel system has been primed. Refer to Testing and Adjusting, "Fuel System - Prime".

5. Check for fuel supply lines that are restricted.

6. Check the fuel filters.

7. If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).

Check for Combustion Problems

Examples of conditions that may cause combustion problems are shown in the following list:

• Cold temperatures

• Injector misfiring

• Low compression

• Mechanical problem

• Valve lash settings

Refer to Testing and Adjusting for more information on a particular problem.