FENDER GP 2908630 - Caterpillar

Engine power is reduced when a properly functioning cylinder is cut out. Make sure that you will not damage auxiliary or driven equipment if the engine power changes suddenly.
Start the Cat ET.
Start the engine. Apply a constant load to the engine.
Use the Cat ET to cut out a single solenoid.
Check for a difference in the sound, feel, or power of the engine as each cylinder is cut out. The amount of change should be similar for all of the good cylinders. The amount of change should be minimal for a weak cylinder or a bad cylinder.
Disable the override. Repeat this step for each of the solenoids.Expected Result:The amount of change should be similar for all of the good cylinders. The amount of change should be minimal for a weak cylinder or a bad cylinder.Results:
OK - There was a noticeable change in engine performance during the Cylinder Cutout Test.Repair: The cylinders are all firing. There may be an intermittent problem. If the problem is intermittent, perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors". Stop.
Not OK - There was no noticeable change in engine performance during the Cylinder Cutout Test.Repair: Remove the valve cover and check the injector and valve lash setting for damage or misadjustment. If no repair is required, refer to Testing and Adjusting, "Checking Engine Cylinders". Stop.Test Step 6. Check for a Short Circuit in the Wiring Harness.
Personal injury can result from high voltage.The Electronic Control Module produces high voltage.Make sure the Electronic Control Module is not powered and the fuel injector solenoids are disconnected before proceeding.
Disconnect the injector connectors J4 through J15 for the injector solenoids.
Measure the resistance between the solenoid wire pairs from ECM connector P2.Measure the resistance for SOLENOID 1 at P2-16 and P2-5.Measure the resistance for SOLENOID 2 at P2-40 and P2-11.Measure the resistance for SOLENOID 3 at P2-26 and P2-5.Measure the resistance for SOLENOID 4 at P2-34 and P2-11.Measure the resistance for SOLENOID 5 at P2-32 and P2-17.Measure the resistance for SOLENOID 6 at P2-28 and P2-21.Measure the resistance for SOLENOID 7 at P2-38 and P2-17.Measure the resistance for SOLENOID 8 at P2-22 and P2-21.Measure the resistance for SOLENOID 9 at P2-37 and P2-27.Measure the resistance for SOLENOID 10 at P2-18 and P2-33.Measure the resistance for SOLENOID 11 at P2-31 and P2-27.Measure the resistance for SOLENOID 12 at P2-12 and P2-33.
Reconnect all connectors.Expected Result:The resistance should be greater than 20,000 Ohms for each measurement.Results:
OK - The resistance is greater than 20,000 Ohms for each measurement. Proceed to test step 8.
Not OK - The resistance is less than 20,000 Ohms for each measurement. There is a short in the harness or connectors.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 7. Isolate the Circuit.
Personal injury can result from high voltage.The Electronic Control Module produces high voltage.Make sure the Electronic Control Module is not powered and the fuel injector solenoids are disconnected before proceeding.
Disconnect the suspect injector at the valve cover base.
Measure the resistance of the injector solenoid