PLATE 5T5974 - Caterpillar

System Operation Description:The engine uses Electronic Unit Injectors that are mechanically actuated and electronically energized. The Electronic Control Module (ECM) sends a 105 volt pulse to each injector solenoid. The pulse is sent at the proper time and at the correct duration for a given engine load and speed. If a diagnostic is detected in the solenoid circuit, the ECM will disable that solenoid circuit. The ECM keeps the solenoid circuit disabled for 10 revolutions of the crankshaft. The ECM then tries to fire the injector. If the diagnostic is still present, the ECM will disable the circuit for another 10 revolutions of the crankshaft. This sequence of events will be repeated indefinitely until the problem is corrected.The 105 volt pulse can be individually cut out to aid in troubleshooting misfire problems by using the Electronic Technician (ET). The solenoid is mounted on top of the fuel injector body.Test Step 1. Check for Connector Damage.
Turn the circuit breaker for the battery to the OFF position.
Turn the Engine Control Switch (ECS) to the OFF/RESET position.
Check the connectors and wiring for the following problems: damage, corrosion, abrasion and incorrect attachment.Expected Result:The connectors and wiring should be free of the following problems: damage, corrosion, abrasion and incorrect attachment.Results:
OK - The connectors and wiring are okay. Proceed to test step 2.
Not OK - The connectors and/or wiring are not okay.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 2. Check for LOGGED Diagnostic Codes.
Connect the ET.
Turn the circuit breaker for the battery to the ON position.
Turn the ECS to the STOP position.
Observe the diagnostic codes on the ET.Expected Result:A CID-FMI 1-05 to 8-05 or 1-06 to 8-06 should not be logged.Results:
OK - A CID-FMI 1-05 to 8-05 or 1-06 to 8-06 is not logged. Proceed to test step 3.
Not OK - A CID-FMI 1-05 to 8-05 or 1-06 to 8-06 is logged. Proceed to test step 5.Test Step 3. Perform the Cylinder Cutout Test.
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 is suddenly reduced.
Turn the circuit breaker for the battery to the OFF position.
Turn the ECS to the OFF/RESET position.
Verify that the ECM connector J2/P2 and the injector connectors J4/P4 through J19/P19 are properly connected.
Turn the circuit breaker for the battery to the ON position.
Install the ET.
Start the engine.
Apply a load to the engine.
Perform the following steps on all suspect cylinders (solenoids).
Use the diagnostic tests on the ET to initiate the Cylinder Cutout Test.
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.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