SHAFT 5M7347 - Caterpillar

Probable Causes
Engine misfires, runs rough, or is unstable
Parameters
Software
Input signal
Fuel system
Inlet air restriction
Fuel injectors
Turbocharger
Exhaust restriction
Driven equipmentRecommended Actions
Table 1
Troubleshooting Test Steps Values Results
1. Check the Operation of the Engine
Engine Operation
Result: The engine operation is in a lug condition, is producing excessive smoke, runs rough, or unstable.
Proceed to Test Step 5.
Result: The engine operation is smooth and appears normal except for top engine speed not being obtained.
Proceed to Test Step 2.
2. Check for Incorrect Configuration Parameters
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Use Cat ET to verify that the correct parameters are being used.
- "High Idle Speed"
Parameters
Result: The parameters are correct.
Proceed to Test Step 3.
Result: The parameters are not correct.
Repair: Input the correct parameters. Refer to Troubleshooting, "Configuration Parameters" for additional information.
If the problem is not resolved, proceed to Test Step 3.
3. Ensure that the latest Flash File Software is Installed in the ECM
A. Connect Cat ET.
B. Use Cat ET to verify that the correct flash file is being used.
Flash File
Result: The latest flash file is installed.
Proceed to Test Step 4.
Result: The latest flash file is not installed.
Repair: Perform the following procedure:
1. Download the latest flash file from SIS web.
2. Install the software into the ECM.
Refer to Troubleshooting, "ECM Software - Install" for additional information.
If the problem is not resolved, proceed to Test Step 4.
4. Check the Desired Speed Input Signal
A. Connect Cat ET.
B. Use Cat ET to monitor the following:
- "Desired Engine Speed"
- "Engine Speed"
Input Signal
Result: The "Desired Engine Speed" parameter is equal to the required engine speed needed for normal operation. The "Engine Speed" parameter is less than "Desired Engine Speed".
There is not a problem with the speed signal input. A mechanical problem is not allowing full engine speed to be achieved.
Proceed to Test Step 5.
Result: The "Desired Engine Speed" parameter is less than the required engine speed needed for normal operation. The "Engine Speed" parameter is equal to "Desired Engine Speed".
Repair: There is a problem with the "Desired Engine Speed" input signal to the ECM. Check the device supplying the "Desired Engine Speed" input signal or wiring for proper set-up and connections.
If the problem is not resolved, proceed to Test Step 5.
5. Inspect the Fuel System
Refer to Testing and Adjusting, "Fuel System Inspection" for additional information.
A. Visually check the fuel level in the fuel tank. Do not rely on the fuel gauge only.
B. Ensure that the vent in the fuel cap is not filled with debris.
C. Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
Note: Cold weather adversely affects the characteristics of the fuel. Refer to the engines Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold-weather operation.
D. Check fuel quality. Refer to Testing and Adjusting, "Fuel Quality - Test" for additional information. Check the fuel tank for debris or foreign objects which may block the fuel supply.
E. Check for fuel leaks.
Fuel System
Result: The fuel system is OK.
Proceed to Test Step 6.
Result: The fuel system is NOT OK.
Repair: Repair or replace damaged fuel