HARNESS AS-PANEL 4307691 - Caterpillar

Probable Causes
Engine start switch
Engine speed/timing sensor(s)
Electrical connections
Fuel supply
Engine shutdown switch (if applicable)
Crank without injection input (if applicable)Recommended Actions
Engine Start Switch
Check the engine start switch on Cat ET. Look for an intermittent problem in the wiring for the engine start switch.Engine Speed/Timing Sensor
If the following diagnostic codes are applicable, check Cat ET for any logged diagnostic codes for the primary engine speed/timing sensor: 190-02, 190-03 and 190-08. If the engine is equipped with a secondary engine speed/timing sensor, check for any of the following logged diagnostic codes: 342-02, 342-03 and 342-08. Refer to the diagnostic functional test Troubleshooting, "Engine Speed/Timing Sensor".Electrical Connectors
Check Cat ET for the following logged diagnostic codes: 168-01 and 168-02. Follow the battery wires from the ECM back to the battery compartment. Refer to the electrical system schematic. Inspect the wires and the power relay. Check the power to the ECM and to the ground connections. Refer to the diagnostic functional test Troubleshooting, "Electrical Power Supply".
Check for correct installation of the J1/P1 and J2/P2 Electronic Control Module (ECM) connectors. Refer to Troubleshooting, "Inspecting Electrical Connectors".
Inspect the battery wires from the ECM back to the battery compartment. Refer to the Electrical System Schematic. Inspect the wires and the power relay. Check the power and ground connections to the ECM. Refer to Troubleshooting, "Electrical Power Supply" for more information. Fuel Supply
Check the fuel level in the fuel tank. Ensure that adequate fuel is available for the application.Check fuel lines for the following problems: restrictions, collapse and pinched line. Repair the lines and/or replace the lines.
Check the fuel tank for foreign objects which may block the fuel supply. Check for air leaks in the suction line of the fuel pump. Prime the fuel system after you perform the following procedures:
Replacing the fuel filters
Working on the low pressure fuel supply circuit
Replacing fuel injectors
Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation.
Check the fuel pressure during engine operation. Check the fuel pressure after the fuel filter. Refer to the Systems Operation/Testing and Adjusting manual for the correct pressure values. If the fuel pressure is low, replace the 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. Engine Shutdown Switch (if applicable)
Use Cat ET to monitor the status of the engine. Check for active shutdowns due to the engine shutdown switch. Determine the cause for the active shutdown and make any repairs necessary.Crank Without Injection Input (if applicable)
If equipped, verify that the plug is installed for the crank without injection input. Ensure that the plug for the crank without injection input is installed securely. Refer to the diagnostic functional test Troubleshooting, "Crank without Injection Input".