0323548 JOHNSON EXHAUSTHOUSING,Innerupper

Probable Causes
Diagnostic codes or event codes
Engine parameter
Electrical connections to the Electronic Control Module (ECM)
Electronic unit injector connector
Emergency stop switch
Circuit breakers
Fuel supplyNote: 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
Diagnostic Codes or Event Codes
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.Engine Parameters
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 in the third box of any status screen on Cat ET.An engine shutdown event will appear on a CAN J1939 device if the device is capable of displaying diagnostic codes.Electrical Connections to the ECM
Check the associated wiring for the following conditions: damage, abrasion, corrosion and incorrect attachment .
J1/P1 and J2/P2 ECM connectors
J401/P401 and J402/P402 Engine Speed/Timing Sensor connectorsRefer to Troubleshooting, "Electrical Connectors - Inspect".
Check Cat ET for the following diagnostic code.
168-02 "System Voltage intermittent/erratic"Check the battery connection at the J61 customer connector and the ECM connector. Refer to the Electrical Schematic. Perform a pull test on P61-1, P61-26, P61-31, and P61-32. Perform a pull test on P1-48, P1-52, P1-53, P1-61, P1-63, P1-65, and P1-70. Refer to Troubleshooting, " Electrical Connectors - Inspect".Note: The problem may occur when the engine is warmed up. As the engine cools, the problem may disappear. The circuit breakers may be exceeding the trip point because of the overheating. Check the circuit breakers on the engine. Reset the circuit breakers.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.Electronic Unit Injector Connector
Check the unit injector connectors J300/P300 and associated wiring for the following conditions: damage, abrasion, corrosion and incorrect attachment. Refer to Troubleshooting, "Electrical Connectors - Inspect".Emergency Stop Switch
Access the screen that displays the status of the emergency stop switch. The emergency stop switch on Cat ET is called "User Shutdown".
Table 1
"User Shutdown Status" Switch Status Measured Voltage at P61-23
OFF Negative battery <0.9 VDC
ON Open circuit >10 VDC Refer to Table 1 for the correct voltage at ECM connector P1. If the voltage is not in the proper range, refer to Troubleshooting, "Engine Shutdown Switch Circuit - Test".Circuit Breakers
Check the circuit breakers. The circuit breakers may exceed the trip point due to overheating. Determine the cause of the excessive current. Reset the circuit breakers if the circuit breakers are tripped.Fuel Supply
Check the fuel lines for the following problems: restrictions, collapsed lines and pinched lines. If problems are found with the fuel lines, repair the lines and/or replace the lines.
Check the fuel tank for foreign objects which may block the fuel supply.
Check for air in the low pressure fuel supply system if any of the following procedures have been performed:
Replacement of the fuel filters
Service on the low pressure fuel supply circuit
Replacement of unit injectorsNote: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Refer to Testing and Adjusting for more information.
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Purge air from the low pressure fuel supply circuit. Refer to Testing and Adjusting, "Fuel System - Prime" for the correct procedure.
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 after the fuel filter while the engine is being cranked. Refer to Testing and Adjusting 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. Refer to Testing and Adjusting for more information.