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.

Note: Use this procedure only if the engine shut down completely and it was necessary to restart the engine.

Probable Causes

• Active diagnostic codes or engine events

• Incorrect parameters for engine rating

• Poor electrical connections to the Electronic Control Module (ECM)

• Poor electrical connections to the unit injector connectors

• Faulty remote shutdown switch

• Tripped circuit breakers

• Fuel supply

• Faulty overspeed verify switch (if applicable)

Note: If the problem only occurs under certain conditions such as high engine speed, full load or engine operating temperature, then perform the test under those operating conditions.

Recommended Actions

Active Diagnostic Codes or Engine Events

Certain diagnostic codes and/or event codes may cause the engine to shutdown. 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.

Incorrect Parameters for Engine Rating

The engine may be shut down due to low pressure levels or other factors. Connect Cat ET and check for active shutdowns or diagnostic codes.

If a shutdown is active, "Injection Disabled" will appear on Cat ET.

An engine shutdown event will appear on a CAN J1939 device if the device is capable of displaying diagnostic codes.

Poor Electrical Connections to the ECM

1. Check the associated wiring for the following conditions: damage, abrasion, corrosion and incorrect attachment .
   • J1/P1 and J2/P2 ECM connectors

   • J61/P61 Customer connector

   • J401/P401 and J402/P402 Engine Speed/Timing Sensor connectors

   Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".

2. Check Cat ET for an active 168-02 "System Voltage intermittent/erratic".

   Check the battery connection at the J61 customer connector and the ECM connector. Perform a pull test on the pin locations at the ECM that are associated with the +Battery and the −Battery connections. Refer to the diagnostic functional test Troubleshooting, " Electrical Connectors - Inspect".

Note: Aftermarket engine protection devices usually interrupt power to the ECM. Check for correct installation and for operation of aftermarket engine protection devices. It may be necessary to bypass aftermarket devices in order to continue testing.

Poor Electrical Connections to the Unit Injector Connectors

Check the J300/P300 valve cover connectors and associated wiring for the following conditions: damage, abrasion, corrosion and incorrect attachment. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".

Faulty Remote Shutdown Switch

Access a status screen in 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".

Tripped Circuit Breakers

Check the circuit breakers. The circuit breakers may exceed the trip point due to overheating. Reset the circuit breakers if the circuit breakers are tripped.

Fuel Supply

Check for a problem with the fuel supply and verify the fuel pressure. Verify that the fuel pressure sensor is installed. Refer to Systems Operation/Testing and Adjusting for additional information.

Faulty Overspeed Verify Switch

If an overspeed condition has occurred, the air shutoff solenoid(s) must be reset manually. Remove wire for the overspeed verify switch from the ECM connector and test again. If the problem goes away, there is a problem in the circuit for the overspeed verify switch. Refer to the diagnostic functional test Troubleshooting, "Switch Circuits - Test".